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Article in Chinese | WPRIM | ID: wpr-888627


The uniformity of blue LED array in jaundice treatment box is improved. The mathematical model of illumination uniformity algorithm for inner and outer LED arrays layout is established. Taking the actual size of blue light board in jaundice treatment box as an example, the optimal illumination uniformity with best LED arrays layout are obtained through programming iteration and simulation verification. The uniformity of blue light LED improved 42.9 % comparing with tradition LED arrays.

Computer Simulation , Humans , Jaundice , Light , Lighting
Santa Tecla, La Libertad; ITCA Editores; ene. 2020. 90 p. ^c28 cm.ilus., tab., graf..
Monography in Spanish | LILACS, BISSAL | ID: biblio-1222433


Se desarrolló una propuesta de intervención arquitectónica y constructiva de iluminación natural, ventilación y confort térmico para el área de rehabilitación del edificio de la Fundación Teletón Pro Rehabilitación FUNTER. Se diseñó una propuesta de interiorismo para uso eficiente de espacios, mobiliario, iluminación artificial, texturas y colores apropiados para el desarrollo de terapias. Se realizó un estudio de eficiencia energética para proponer medidas de ahorro y uso eficiente de la energía en el edificio. Se diseñó una nueva distribución de espacios en la zona de terapia y se aplicaron criterios de bioclimatismo pasivo, como la ventilación cruzada, ventilación cenital y la apertura de áreas de ventilación basándose en el análisis de vientos del sitio para mejorar la sensación térmica interna. La implementación de un jardín sensorial ayudará a los pacientes de terapia de marcha a interactuar en un área más cercana a las superficies reales del ambiente.

An architectural and constructive intervention proposal for natural lighting, ventilation and thermal comfort was developed for the rehabilitation area of ​​the Teletón Pro Rehabilitation Foundation FUNTER building. An interior design proposal was designed for the efficient use of spaces, furniture, artificial lighting, textures and appropriate colors for the development of therapies. An energy efficiency study was carried out to propose measures for saving and efficient use of energy in the building. A new distribution of spaces was designed in the therapy area and passive bioclimatic criteria were applied, such as cross ventilation, overhead ventilation and the opening of update areas in the site wind analysis to improve the internal thermal sensation. Implementing a sensory garden will help gait therapy patients interact in an area closer to the actual surfaces of the environment.

Disabled Persons/rehabilitation , Facility Design and Construction , Interior Design and Furnishings , Therapeutics , Ventilation , Lighting , Health of the Disabled , Usage Remodeling
J. appl. oral sci ; 28: e20190693, 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1134791


Abstract Debonding, staining and wear are usually the reasons for denture teeth replacement by new ones from same or different brands. Objective This study investigates the possible differences in color of denture teeth of the same or different brands under different illuminations, since their metameric behavior in color under specific illumination may become unacceptable. Methodology For the purpose of this study, 10 denture teeth (#11), shade A3, of 4 different brands were selected (Creopal/KlemaDental Pro, Executive/DeguDent, Cosmo HXL/DeguDent, Ivostar/Ivoclar-Vivadent). Teeth stabilized in white silicone mold and the CIELAB color coordinates of their labial surface under 3 different illumination lights (D65, F2, A) were recorded, using a portable colorimeter (FRU/WR-18, Wave Inc). ΔE*ab values of all possible pairs of teeth of the same brand (n=45) or pair combinations of different brands (n=100) under each illumination light, in a dry and wet state were calculated. Data were analyzed statistically using 3-way ANOVA, Friedman's and Wilcoxon's tests at a significance level of α=0.05. Results The results showed that brand type affected significantly L*, a* and b* coordinates (p<0.0001), illumination a* and b* coordinates (p<0.0001), but none of them was affected by the hydration state of teeth (p>0.05). Intra-brand color differences ranged between 0.21-0.78ΔΕ* units with significant differences among brands (p<0.0001), among illumination lights (p<0.0001) and between hydration states (p=0.0001). Inter-brand differences ranged between 2.29-6.29ΔΕ* units with significant differences among pairs of brands (p<0.0001), illumination lights (p<0.0001) and hydration states (p<0.0001). Conclusions Differences were found between and within brands under D65 illumination which increased under F2 or A illumination affected by brand type and hydration status. Executive was the most stable brand than the others under different illuminations or wet states and for this reason its difference from other brands is the lowest. In clinical practice, there should be no blending of teeth of different brands but if we must, we should select those that are more stable under different illuminations

Humans , Lighting , Dentures , Prosthesis Coloring , Reference Values , Surface Properties/radiation effects , Materials Testing , Analysis of Variance , Colorimetry , Statistics, Nonparametric
Rev. bras. ginecol. obstet ; 41(1): 24-30, Jan. 2019. tab, graf
Article in English | LILACS | ID: biblio-1003521


Abstract Objective The aim of this study is to evaluate whether exposure to different environmental lighting conditions affects the reproductive parameters of pregnant mice and the development of their offspring. Methods Fifteen pregnant albino mice were divided into three groups: light/dark, light, and dark. The animalswere euthanized on day 18 of pregnancy following the Brazilian Good Practice Guide for Euthanasia of Animals.Maternal and fetal specimens weremeasured and collected for histological evaluation. Analysis of variance (ANOVA) test was used for comparison of the groups considering p ≤ 0.05 to be statistically significant. Results There was no significant difference in the maternal variables between the three groups. Regarding fetal variables, significant differences were observed in the anthropometric measures between the groups exposed to different environmental lighting conditions, with the highest mean values in the light group. The histological evaluation showed the same structural pattern of the placenta in all groups, which was within the normal range. However, evaluation of the uterus revealed a discrete to moderate number of endometrial glands in the light/dark and light groups, which were poorly developed in most animals. In the fetuses, pulmonary analysis revealed morphological features consistent with the transition from the canalicular to the saccular phase in all groups. Conclusion Exposure to different environmental lighting conditions had no influence on the reproductive parameters of female mice, while the offspring of mothers exposed to light for 24 hours exhibited better morphometric features.

Resumo Objetivo Avaliar se a exposição a diferentes luminosidades no ambiente afeta parâmetros reprodutivos de camundongos fêmeas prenhas e o desenvolvimento de sua prole. Métodos Foram selecionados para o estudo 15 camundongos fêmeas albinas prenhas. Os camundongos foram separados em grupos: luz/escuro, luz e escuro. As fêmeas foram eutanasiadas no 18° dia de gestação, seguindo as recomendações do Guia Brasileiro de Boas Práticas para a Eutanásia de animais. Tanto peças maternas como fetais foram mensuradas e coletadas para avaliação histológica. Foi utilizado o teste de Análise de variantes (Anova) para comparação dos grupos, considerando estatisticamente significativo o valor de p ≤ 0,05. Resultados Ao comparar as variáveis maternas entre os três grupos, não foi encontrada diferença estatística significativa. Em relação às variáveis fetais, houve diferenças estatísticas entre as medidas de antropometria dos grupos submetidos a diferentes luminosidades do ambiente, com melhores valores médios no grupo luz. Histologicamente, a avaliação placentária evidenciou em todos os grupos o mesmo padrão estrutural, com todos dentro da normalidade. No entanto, a avaliação de úteros, tanto do grupo luz/escuro quanto do grupo luz,mostrou quantidade discreta amoderada de glândulas endometriais, com pouco desenvolvimento na maioria dos animais. Nos fetos, análise pulmonar evidenciou características morfológicas compatíveis com a transição da fase canalicular para sacular em todos os grupos. Conclusão As exposições a diferentes luminosidades no ambiente não influenciaram nos parâmetros reprodutivos das fêmeas, entretanto, a ninhada das mães que receberam luz em todo período apresentou melhores medidas morfométricas.

Animals , Female , Pregnancy , Mice , Lighting/methods , Pregnancy Outcome , Time Factors , Fetal Development/radiation effects , Light , Animals, Newborn/growth & development
Article in Korean | WPRIM | ID: wpr-766882


PURPOSE: We compared the posterior capsule rupture (PCR) rate between microscope versus intracameral illumination in phacoemulsification surgery performed by novice ophthalmologists. METHODS: We conducted a retrospective chart review of 300 eyes of 211 patients who underwent phacoemulsification by novice ophthalmologists from March 2012 to October 2017. Novice ophthalmologists (n = 6) were divided into those using microscope illumination (n = 4) and intracameral illumination users (n = 2). The first 50 cataract surgery cases of each novice ophthalmologist were reviewed. The results using a phacoemulsification machine and microscopy were the same. The intraoperative complications and learning curve in each case were evaluated. RESULTS: Phacoemulsifications performed by novice ophthalmologists showed a statistically significant difference in PCR rate between the microscope illumination (19.0%, 38/200) and intracameral illumination (4.0%, 4/100) groups (p = 0.001). The incidence of PCR was reduced to 22%, 18%, 16%, 12%, and 8% per 10 cases in the microscope group, while it was 15% in the first 10 cases and 0% in 50 cases thereafter in the intracameral illumination group. CONCLUSIONS: Novice surgeons had a lower PCR rate during cataract surgery using intracameral illumination than using microscope illumination. Both groups showed a tendency for the PCR to decrease with increasing surgical cases, but the intracameral illumination group showed a shorter learning curve.

Cataract , Humans , Incidence , Intraoperative Complications , Learning Curve , Lighting , Microscopy , Phacoemulsification , Polymerase Chain Reaction , Retrospective Studies , Rupture , Surgeons
Article in English | WPRIM | ID: wpr-763952


OBJECTIVES: In this paper, we present an efficient method to visualize computed tomography (CT) datasets using ambient occlusion, which is a global illumination technique that adds depth cues to the output image. We can change the transfer function (TF) for volume rendering and generate output images in real time. METHODS: In preprocessing, the mean and standard deviation of each local vicinity are calculated. During rendering, the ambient light intensity is calculated. The calculation is accelerated on the assumption that the CT value of the local vicinity of each point follows the normal distribution. We approximate complex TF forms with a smaller number of connected line segments to achieve additional acceleration. Ambient occlusion is combined with the existing local illumination technique to produce images with depth in real time. RESULTS: We tested the proposed method on various CT datasets using hand-drawn TFs. The proposed method enabled real-time rendering that was approximately 40 times faster than the previous method. As a result of comparing the output image quality with that of the conventional method, the average signal-to-noise ratio was approximately 40 dB, and the image quality did not significantly deteriorate. CONCLUSIONS: When rendering CT images with various TFs, the proposed method generated depth-sensing images in real time.

Acceleration , Computer Systems , Cues , Dataset , Lighting , Mathematical Computing , Methods , Signal-To-Noise Ratio
Biomedical Engineering Letters ; (4): 279-291, 2019.
Article in English | WPRIM | ID: wpr-785523


Light sheet microscopy (LSM) is an evolving optical imaging technique with a plane illumination for optical sectioning and volumetric imaging spanning cell biology, embryology, and in vivo live imaging. Here, we focus on emerging biomedical applications of LSM for tissue samples. Decoupling of the light sheet illumination from detection enables high-speed and large field-of-view imaging with minimal photobleaching and phototoxicity. These unique characteristics of the LSM technique can be easily adapted and potentially replace conventional histopathological procedures. In this review, we cover LSM technology from its inception to its most advanced technology; in particular, we highlight the human histopathological imaging applications to demonstrate LSM's rapid diagnostic ability in comparison with conventional histopathological procedures. We anticipate that the LSM technique can become a useful three-dimensional imaging tool for assessing human biopsies in the near future.

Biopsy , Dermatitis, Phototoxic , Embryology , Humans , Imaging, Three-Dimensional , Lighting , Microscopy , Optical Imaging , Photobleaching
Biomedical Engineering Letters ; (4): 387-394, 2019.
Article in English | WPRIM | ID: wpr-785514


This paper presents a new class of local neighborhood based wavelet feature descriptor (LNWFD) for content based medical image retrieval (CBMIR). To retrieve images effectively from large medical databases is backbone of diagnosis. Existing wavelet transform based medical image retrieval methods suffer from high length feature vector with confined retrieval performance. Triplet half-band filter bank (THFB) enhanced the properties of wavelet filters using three kernels. The influence of THFB has employed in the proposed method. First, triplet half-band filter bank (THFB) is used for single level wavelet decomposition to obtain four sub-bands. Next, the relationship among wavelet coefficients is exploited at each sub-band using 3 × 3 neighborhood window to form LNWFD pattern. The novelty of the proposed descriptor lies in exploring relation between wavelet transform values of pixels rather than intensity values which gives more detail local information in wavelet sub-bands. Thus, proposed feature descriptor is robust against illumination. Manhattan distance is used to compute similarity between query feature vector and feature vector of database. The proposed method is tested for medical image retrieval using OASIS-MRI, NEMA-CT, and Emphysema-CT databases. The average retrieval precisions achieved are 71.45%, 99.51% of OASIS-MRI and NEMA-CT databases for top ten matches considered respectively and 55.51% of Emphysema-CT database for top 50 matches. The superiority in terms of performance of the proposed method is confirmed by the experimental results over the well-known existing descriptors.

Diagnosis , Humans , Lighting , Methods , Residence Characteristics , Subject Headings , Triplets , Wavelet Analysis
Cad. Saúde Pública (Online) ; 35(7): e00007918, 2019. graf
Article in Portuguese | LILACS | ID: biblio-1011717


A abordagem do nexo urbano corresponde à compreensão e à busca de soluções integradas mediante o reconhecimento das interdependências entre água, energia e alimentos, recursos cuja escassez configura iniquidades em saúde. A hipótese central deste artigo considera que o contexto de escassez corrobora práticas sociais que podem ser sinérgicas ou contraditórias em relação aos desafios da sustentabilidade e dos direitos sociais. O objetivo é investigar sinergias e contradições a partir de práticas sociais mediante o nexo urbano no bairro Novo Recreio, na cidade de Guarulhos, Região Metropolitana de São Paulo, Brasil. A metodologia consiste em um estudo qualitativo e de base etnográfica com referência à Teoria das Práticas, com observações diretas de campo e narrativas. Os resultados apresentaram práticas sociais associadas a falta sistemática de água, precariedades na iluminação pública e no transporte, bem como dificuldade de acesso a alimentos frescos e saudáveis. O estudo das práticas sociais entre sinergias e contradições permitiu verificar que, nesse processo espontâneo de busca de solução para problemas locais, é constatada a necessidade de integrar práticas e saberes locais a políticas públicas e demandas globais. Com isso, denominamos nexos de exclusão a condição periférica de impossibilidade de opções conscientes que permitam orientar conjuntamente a redução da escassez e de iniquidades com alternativas para a sustentabilidade.

El abordaje del nexo urbano se corresponde con la comprensión y búsqueda de soluciones integradas, mediante el reconocimiento de las interdependencias entre agua, energía, alimentos y recursos, cuya escasez configura inequidades en salud. La hipótesis central de este artículo considera que el contexto de escasez corrobora prácticas sociales que pueden ser sinérgicas o contradictorias, a través de los desafíos en sostenibilidad y derechos sociales. Los objetivos son investigar sinergias y contradicciones, a partir de prácticas sociales mediante el nexo urbano en el barrio Novo Recreio, en la ciudad de Guarulhos, región metropolitana de São Paulo, Brasil. La metodología consiste en un estudio cualitativo y de base etnográfica, vinculado a la teoría de las prácticas, analizando observaciones de campo directas y relatos. Los resultados presentaron prácticas sociales asociadas a la falta sistemática de agua, precariedad en la iluminación pública y el transporte, dificultad de acceso a alimentos frescos y saludables. El estudio de las prácticas sociales entre sinergias y contradicciones permitió verificar que, en ese proceso espontáneo de búsqueda de soluciones para problemas locales, se constata la necesidad de integrar prácticas y saberes locales con políticas públicas y demandas globales. De esta forma, denominamos nexos de exclusión a las condiciones periféricas de imposibilidad, en cuanto a opciones conscientes que permitan orientar conjuntamente la reducción de la escasez e iniquidades con alternativas para la sostenibilidad.

The urban nexus approach involves the investigation and elucidation of integrated solutions through the recognition of tradeoffs between water, energy, and food, namely resources whose shortage leads to inequalities in health. The article's central hypothesis is that the context of shortage corroborates social practices that can be synergic or contradictory in relation to the challenges of sustainability and social rights. The objective is to investigate synergies and contradictions based on social practices in the urban nexus in the neighborhood of Novo Recreio in the city of Guarulhos, Greater Metropolitan São Paulo, Brazil. The methodology consists of a qualitative ethnographic study drawing on practice theory as the reference, with direct field observations and narratives. The results featured social practices associated with systematic lack of water, precarious public lighting and transportation, and difficult access to fresh and healthy foods. The study of social practices between synergies and contradictions allowed verifying that this spontaneous process of search for solutions to local problems reveals the need to incorporate local practices and knowledge into public policies and global demands. We define nexus of exclusion as the peripheral condition of impossibility of conscious options that allow jointly orienting the reduction of shortage and iniquities through alternatives for sustainability.

Humans , Social Behavior , Urban Health , Suburban Health , Sustainable Development , Socioeconomic Factors , Transportation , Water Supply , Brazil , Lighting , Health Knowledge, Attitudes, Practice/ethnology , Surveys and Questionnaires , Food Supply , Anthropology, Cultural/methods
Rev. gaúch. enferm ; 40: e20180464, 2019.
Article in Portuguese | LILACS, BDENF | ID: biblio-1043024


Resumo OBJETIVO Compreender as vivências de enfermeiras obstétricas que atenderam ao parto em ambiente com baixa luminosidade. MÉTODOS Estudo qualitativo, exploratório e descritivo. Realizou-se entrevista com oito enfermeiras obstétricas, em um hospital municipal de São Paulo, entre dezembro de 2015 e março de 2016. Os dados foram analisados por análise temática de conteúdo proposta por Bardin. RESULTADOS Foram apreendidas três temáticas: 1- Benefícios atribuídos à baixa luminosidade em sala de parto; 2- Dificuldades atribuídas à baixa luminosidade em sala de parto e 3- Efeitos da baixa luminosidade sobre a atuação do profissional. CONCLUSÕES A baixa luminosidade pode tornar o parto mais tranquilo e aumentar a atenção ao momento vivido pela mulher e seu bebê, proporcionando autonomia para a mulher e atendimento humanizado por parte da equipe. Surgiram como dificuldades, a dinâmica de trabalho do setor e a falta de familiaridade com o método, por parte de alguns profissionais e parturientes.

Resumen OBJETIVO Comprender las vivencias de enfermeras obstétricas que atendieron al parto en ambiente con baja luminosidad. MÉTODOS Estudio cualitativo, exploratorio y descriptivo. Se entrevistaron ocho enfermeras obstétricas en un hospital municipal de San Pablo, entre diciembre de 2015 y marzo de 2016. Se realizó un análisis temático de contenido propuesto por Bardin. RESULTADOS Se revelaron tres temáticas: 1- Beneficios atribuidos a la baja luminosidad en la sala de parto; 2- Dificultades atribuidas a la baja luminosidad en la sala de parto y 3- Efectos de la baja luminosidad sobre la actuación del profesional. CONCLUSIONES La baja luminosidad puede hacer el parto más tranquilo y aumentar la atención al momento vivido por la mujer y su bebé, proporcionando autonomía a la mujer y atención humanizada por parte del equipo. Surgieron como dificultades la dinámica de trabajo del sector y la falta de familiaridad con el método por parte de algunos profesionales y algunas parturientas.

Abstract OBJECTIVE To understand the experiences of obstetric nurses accomplishing the delivery under a low light environment. METHODS Qualitative, exploratory and descriptive study. An interview was carried with eight obstetrical nurses at a municipal hospital in São Paulo between December 2015 and March 2016. Data was analyzed using content thematic analysis proposed by Bardin. RESULTS Three themes were studied: 1- Benefits attributed to low light in the delivery room; 2- Difficulties attributed to low light in the delivery room and 3- Effects of low light on the performance of the professional CONCLUSIONS Low light may facilitate the delivery and increase attention to the moment experienced by the woman and her baby, providing autonomy for the woman and humanized care on the part of the team. The sector's work dynamics and the lack of familiarity with the method have emerged as difficulties, on the part of some professionals and parturients.

Humans , Male , Female , Pregnancy , Adult , Lighting , Attitude of Health Personnel , Delivery, Obstetric/methods , Delivery Rooms , Obstetric Nursing , Qualitative Research , Health Facility Environment , Middle Aged
Rev. bras. oftalmol ; 77(5): 268-271, set.-out. 2018. graf
Article in Portuguese | LILACS | ID: biblio-977865


Resumo Objetivos: Medir o ângulo lâmbda (AL) em indivíduos no pré-operatório de facectomias, correlacionando a sua presença com o comprimento axial e o esférico dos olhos. Sugerir condutas para o implante de LIO multifocal de acordo com a presença do ângulo lâmbda. Métodos: Estudo transversal em 128 olhos de 74 indivíduos candidatos à cirurgia de catarata para registrar a equivalente presença do ângulo lâmbda. Resultados: Avaliando o ângulo lâmbda observou-se uma correlação positiva (r= 0,559 / p= 0,000) para o tamanho desse ângulo comparando-se os dois olhos. Não houve correlação entre o tamanho do ângulo lâmbda e o equivalente esférico no olho direito (r= -0,027 / p= 0,840), mas foi verificada correlação positiva para o olho esquerdo (r= 0,313 / p= 0,013). A presença da hipermetropia correlacionou com os comprimentos axiais pequenos, assim como a miopia com os grandes. Observou-se correlação negativa entre o tamanho do ângulo lâmbda e o comprimento axial para os dois olhos, sendo de r= -0,249 para o olho direito (p= 0,042) e r= -0,281 para o olho esquerdo (p= 0,018) Conclusões: Houve correlação entre a presença de ângulo lâmbda maior e comprimentos axiais menores para os dois olhos. Para o equivalente esférico hipermétrope houve correlação com a presença de um ângulo lâmbda maior apenas para o olho esquerdo. Esse trabalho sugere parcimônia nos implantes de LIO multifocal na presença de ângulo lâmbda significativo, baseado na teoria que a presença desse ângulo é reguladora do equilíbrio entre as aberrações da superfície corneana versus cristalineanas.

Abstract Objectives: To measure the labral angle (LA) in individuals in the preoperative period of facectomies, correlating their presence with axial length and spherical equivalent of the eyes. Suggest conduits for the implantation of multifocal IOL according to the presence of the lambda angle. Methods: A cross-sectional study of 128 eyes of 74 individuals who were candidates for cataract surgery to record the presence of the lambda angle. Results: A positive correlation (r = 0.559 / p = 0.000) was observed for the angle of this angle by comparing the two eyes. There was no correlation between the size of the lambda angle and the spherical equivalent in the right eye (r = -0.027 / p = 0.840), but a positive correlation was observed for the left eye (r = 0.313 / p = 0.013). The presence of hyperopia correlated with small axial lengths, as did myopia with large ones. There was a negative correlation between the angle of the tongue and the axial length of the two eyes, with r = -0.249 for the right eye (p = 0.042) and = 0.281 for the left eye (p = 0.018). Conclusions: There was a correlation between the presence of a larger lambda angle and smaller axial lengths for both eyes. For the spherical hypermétrope equivalent, there was a correlation with the presence of a larger blunt angle only for the left eye. This work suggests parsimony in multifocal IOL implants in the presence of a significant lamella angle, based on the theory that the presence of this angle regulates the balance between corneal versus crystaline surface aberrations.

Humans , Male , Female , Adult , Middle Aged , Aged , Aged, 80 and over , Pupil/physiology , Corneal Topography/methods , Lens Implantation, Intraocular , Axial Length, Eye , Multifocal Intraocular Lenses , Lighting , Cataract Extraction/statistics & numerical data , Cross-Sectional Studies , Biometry/instrumentation , Biometry/methods , Preoperative Period , Fixation, Ocular , Ocular Physiological Phenomena
Rev. Hosp. El Cruce ; (22): 46-51, 20180613. ilus
Article in Spanish | LILACS, BINACIS | ID: biblio-914954


La mayoría de los microscopios ópticos del Hospital, tienen un sistema de iluminación que utiliza una lámpara halógena, tecnología que es ampliamente superada (en varios aspectos) en la actualidad por la iluminación LED. Debido a que los proveedores de microscopios manifestaron no realizar la actualización de los equipos ya instalados y el costo de renovación del equipamiento es excesivo, se planteó un diseño propio para actualizar los equipos con los que cuenta el HEC.

Most of the hospital optical microscopes have a lighting system which uses halogen lamps, a technology widely overcome (in several respects) by the LED system. Since microscope providers said they would not upgrade the equipment already installed and the renewal costs are excessive, a design of its own was proposed to upgrade the equipment the HEC have.

Equipment and Supplies , Lighting , Microscopy
Article in English | WPRIM | ID: wpr-716801


BACKGROUND: To investigate the influence of nocturnal ambient light on visual function and ocular fatigue. METHODS: Sixty healthy subjects (30 men and 30 women) aged 19 through 29 years with no history of ocular disease were recruited. All subjects spent 3 consecutive nights in the sleep laboratory. During the first and second nights, the subjects were not exposed to light during sleep, but during the third night, they were exposed to ambient light, measuring 5 or 10 lux at the eye level, which was randomly allocated with 30 subjects each. The visual function and ocular fatigue were assessed at 7 a.m. on the 3rd and 4th mornings, using best-corrected visual acuity, refractive error, conjunctival hyperemia, tear break-up time, maximal blinking interval, ocular surface temperature, and subjective symptoms reported on a questionnaire. RESULTS: Three men and three women subjects failed to complete the study (4 in the 5 lux; 2 from the 10 lux). For the entire 54 subjects, tear break-up time and maximal blinking interval decreased (P = 0.015; 0.010, respectively), and nasal and temporal conjunctival hyperemia increased significantly after sleep under any ambient light (P < 0.001; 0.021, respectively). Eye tiredness and soreness also increased (P = 0.004; 0.024, respectively). After sleep under 5 lux light, only nasal conjunctival hyperemia increased significantly (P = 0.008). After sleep under 10 lux light, nasal and temporal conjunctival hyperemia, eye tiredness, soreness, difficulty in focusing, and ocular discomfort increased significantly (P < 0.05). CONCLUSION: Nocturnal ambient light exposure increases ocular fatigue. Avoiding ambient light during sleep could be recommended to prevent ocular fatigue.

Asthenopia , Blinking , Dry Eye Syndromes , Fatigue , Female , Healthy Volunteers , Humans , Hyperemia , Lighting , Male , Refractive Errors , Tears , Visual Acuity
Article in English | WPRIM | ID: wpr-762492


BACKGROUND: Lighting is one of the environmental factors affecting the performance of the control room operators. Therefore, the aim of this study was to compare the control room operators’ visual performance in two different illumination conditions at a combined cycle power plant through field-work. METHODS: Sixteen operators in day shift were evaluated with the Freiburg Visual Acuity test (FrACT) software at two lighting systems with different intensities. It includes the first phase with fluorescent illumination system (Power: 40 W, Color Temperature: 4000 Kelvin, Luminous Flux: 2780 Lumen and Model: Pars Shahab) and the second phase with a combined illumination system includes fluorescent and LED (Power: 48 W, Color Temperature: 4000 Kelvin, Luminous Flux: 5400 Lumen and Model: Mazinoor). RESULTS: Based on the results, visual performance index and visual acuity significantly increased after the intervention (p < 0.001). As to contrast, more lighting significantly reduced the percentage of recognized contrast (p < 0.001) and increased the contrast performance index (p < 0.001). CONCLUSIONS: The results of this study showed that increasing the intensity of light from the values below the allowable limit to the values above the allowable limit would increase the visual indicators in individuals.

Lighting , Power Plants , Visual Acuity
Article in English | WPRIM | ID: wpr-714259


Dry socket, also termed fibrinolytic osteitis or alveolar osteitis, is a complication of tooth exodontia. A dry socket lesion is a post-extraction socket that exhibits exposed bone that is not covered by a blood clot or healing epithelium and exists inside or around the perimeter of the socket or alveolus for days after the extraction procedure. This article describes dry socket lesions; reviews the basic clinical techniques of treating different manifestations of dry socket lesions; and shows how microscope level loupe magnification of 6× to 8× or greater, combined with co-axial illumination or a dental operating microscope, facilitate more precise treatment of dry socket lesions. The author examines the scientific validity of the proposed causes of dry socket lesions (such as bacteria, inflammation, fibrinolysis, or traumatic extractions) and the scientific validity of different terminologies used to describe dry socket lesions. This article also presents an alternative model of what causes dry socket lesions, based on evidence from dental literature. Although the clinical techniques for treating dry socket lesions seem empirically correct, more evidence is required to determine the causes of dry socket lesions.

Bacteria , Diagnosis , Dry Socket , Epithelium , Fibrinolysis , Inflammation , Lighting , Osteitis , Tooth
Article in English | WPRIM | ID: wpr-713844


PURPOSE: To investigate the outcomes of scleral buckling surgery performed under a slit-lamp illumination system (Visulux) with a contact wide-angle viewing lens (Mini Quad) in patients with rhegmatogenous retinal detachment (RRD) and to compare these outcomes with those of surgery performed under an indirect ophthalmoscope. METHODS: By retrospective review of electronic medical records, patients with RRD who had undergone scleral buckling surgery were identified. Scleral buckling surgeries were performed with two illumination instruments, a slit-lamp (SL group) and an indirect ophthalmoscope (IO group). Subretinal fluid drainage, cryopexy, and intravitreal gas injection were performed optionally. At 6 months after surgery, anatomical and functional outcomes were evaluated and compared between the two groups. Operation time was also compared between the two groups. RESULTS: Of the 45 total patients (45 eyes), 28 were included in the SL group, and 17 were included in the IO group. In the SL and IO groups, the primary anatomical success rate was 89.3% and 88.2%, respectively (p = 0.92). The logarithm of the minimal angle of resolution change, which reflects improvement in best-corrected visual acuity after surgery, was −0.19 ± 0.38 in the SL group and −0.21 ± 0.63 in the IO group; this difference was not statistically significant (p = 0.91). The mean operation time was significantly shorter in the SL group (78.9 ± 11.8 minutes) than in the IO group (100.0 ± 13.9 minutes, p < 0.001), especially for patients who underwent additional procedures such as subretinal fluid drainage and cryopexy (81.4 ± 12.9 and 103.5 ± 12.3 minutes, respectively, p < 0.001). CONCLUSIONS: Scleral buckling surgery performed under a slit-lamp illumination system yielded a similar anatomical success rate and similar functional improvement in RRD compared with surgery performed under an indirect ophthalmoscope. The slit-lamp system could save time, especially in bullous RRD, which requires additional subretinal fluid drainage.

Drainage , Electronic Health Records , Humans , Jupiter , Lighting , Ophthalmoscopes , Retinal Detachment , Retrospective Studies , Scleral Buckling , Slit Lamp , Subretinal Fluid , Visual Acuity
Rev Rene (Online) ; 19: e3478, jan. - dez. 2018.
Article in Portuguese | LILACS, BDENF | ID: biblio-946632


Objetivo: analisar as fontes estressoras em pacientes de unidade de terapia intensiva neonatal. Métodos: estudo transversal, desenvolvido em maternidade pública de referência, com 60 profissionais de enfermagem que prestaram cuidados aos 24 recém-nascidos internados. Para coleta de dados, foi utilizado questionário sociodemográfico e Escala de Estressores em Unidades de Terapia Intensiva, esta para identificação dos fatores estressores. Foi adotado valor de p<0,05 para os testes. Resultados: do total de profissionais, 18 (30,0%) eram enfermeiros. A maior parte dos recém-nascidos era prematuro-moderado, com tempo de internação entre oito e 15 dias. Ser furado por agulhas foi o fator de maior estresse e silenciar alarmes a principal ação mencionada como estratégia de redução de fatores estressores. Conclusão: as 15 fontes estressoras avaliadas apresentaram escores médios elevados, mostrando que a unidade de terapia intensiva neonatal se configura como ambiente que varia entre estressante e muito estressante para recém-nascidos. (AU)

Humans , Infant, Newborn , Infant, Newborn , Intensive Care Units, Neonatal , Lighting , Noise , Stress, Mechanical
Rev. bras. oftalmol ; 76(3): 144-149, maio-jun. 2017. tab
Article in English | LILACS | ID: biblio-899055


Abstract Purpose: This study aimed to determine the presence of the symptoms of computer vision syndrome (CVS) accounting office employees. Methods: The research tools used were a questionnaire based on the set of symptoms of CVS rated by Likert scale (1-5) and workplace observations based on Ergonomic Workplace Analysis (EWA). Results: The participants who worked with a viewing angle of less than 10º relative to the screen had more symptoms, particularly of pain in the back of the neck and back (p = 0.0460). The participants who used lighting other than 450 and 699 lux reported significant headache (p = 0.0045) and dry eye (p = 0.0329) symptoms. Younger workers had more headaches (p = 0.0182), and workers with fewer years of employment had more headaches and dry eyes symptoms (p = 0.0164 and p = 0.0479, respectively). A total of 37% of the participants reported a lack of guidance regarding prevention and painful symptoms in the back of the neck and back (p = 0.0936). Conclusion: Younger participants with fewer years of employment, who had not received information regarding proper computer use, who did not use lighting between 450 and 699 lux or who worked with viewing angles of less than 10º had more computer vision syndrome symptoms.

Resumo Objetivo: Este trabalho objetivou averiguar a presença dos sintomas da Síndrome Visual dos Computadores (SVC) trabalhadores de escritórios de contabilidade. Métodos: Como instrumentos de pesquisa utilizou-se um questionário baseado no conjunto de sintomas da SVC, avaliado por Escala Likert (1-5), e foram realizadas observações no local de trabalho baseadas na Avaliação Ergonômica de Postos de Trabalho. Resultados: Os participantes que trabalhavam com o ângulo de visão menor do que 10º em relação à tela foram os que apresentaram mais sintomas sobretudo de dor na parte posterior do pescoço e nas costas (p=0,0460). Aqueles que usavam iluminação diferente de 450 e 699 lux reportaram sintomas significativos para dor de cabeça (p=0,0045) e ressecamento ocular (p=0,0329). Os mais jovens apresentaram mais dor de cabeça (p=0,0182) e aqueles com menor tempo de trabalho mais sintomas de dor de cabeça e ressecamento ocular (respectivamente p=0,0164 e p=0,0479). A falta de recebimento de orientações sobre prevenção foi confirmada por 37% participantes que referiram mais sintomas de dor na parte posterior do pescoço e nas costas (p=0,0936). Conclusão: Os participantes mais jovens, com menor tempo de trabalho, que não haviam recebido informações sobre o uso de computador, não utilizavam iluminação entre 450 e 699 lux ou trabalhavam com o ângulo de visão menor do que 10º apresentaram mais sintomas da síndrome visual do computador.

Humans , Male , Female , Adolescent , Adult , Middle Aged , Aged , Eye Health , Computer Terminals , Ergonomics , Vision Disorders , Working Environment , Attitude to Computers , Lighting , Surveys and Questionnaires , Occupational Health , Workplace , Occupational Diseases
Acta cir. bras ; 32(3): 251-262, Mar. 2017.
Article in English | LILACS | ID: biblio-837693


Abstract Purpose: To identify the most relevant flaws in standardization in husbandry practices and lack of transparency to report them. This review proposes some measures in order to improve transparency, reproducibility and eventually external validity in experimental surgery experiments with rat model. Methods: We performed a search of scientific articles in PUBMED data base. The survey was conducted from august 2016 to January 2017. The keywords used were "reproducibility", "external validity", "rat model", "rat husbandry", "rat housing", and the time frame was up to January 2017. Articles discarded were the ones which the abstract or the key words did not imply that the authors would discuss any relationship of husbandry and housing with the reproducibility and transparency of reporting animal experiment. Reviews and papers that discussed specifically reproducibility and data reporting transparency were laboriously explored, including references for other articles that could fulfil the inclusion criteria. A total of 246 articles were initially found but only 44 were selected. Results: Lack of transparency is the rule and not the exception when reporting results with rat model. This results in poor reproducibility and low external validity with the consequence of considerable loss of time and financial resources. There are still much to be done to improve compliance and adherence of researchers, editors and reviewers to adopt guidelines to mitigate some of the challenges that can impair reproducibility and external validity. Conclusions: Authors and reviewers should avoid pitfalls of absent, insufficient or inaccurate description of relevant information the rat model used. This information should be correctly published or reported on another source easily available for readers. Environmental conditions are well known by laboratory animal personnel and are well controlled in housing facilities, but usually neglected in experimental laboratories when the rat model is a novelty for the researcher.

Animals , Rats , Research Design/standards , Models, Animal , Animal Experimentation/standards , Housing, Animal/standards , Animal Husbandry/standards , Reference Standards , Lighting , Adaptation, Physiological , Sex Factors , Reproducibility of Results , Age Factors , Environment , Acclimatization , Intestines/microbiology , Animal Feed