Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 1.194
Filter
1.
J Therm Biol ; 121: 103867, 2024 Apr.
Article in English | MEDLINE | ID: mdl-38744026

ABSTRACT

Infrared thermography (IRT) has become more accessible due to technological advancements, making thermal cameras more affordable. Infrared thermal cameras capture the infrared rays emitted by objects and convert it into temperature representations. IRT has emerged as a promising and non-invasive approach for examining the human eye. Ocular surface temperature assessment based on IRT is vital for the diagnosis and monitoring of various eye conditions like dry eye, diabetic retinopathy, glaucoma, allergic conjunctivitis, and inflammatory diseases. A collective sum of 192 articles was sourced from various databases, and through adherence to the PRISMA guidelines, 29 articles were ultimately chosen for systematic analysis. This systematic review article seeks to provide readers with a thorough understanding of IRT's applications, advantages, limitations, and recent developments in the context of eye examinations. It covers various aspects of IRT-based eye analysis, including image acquisition, processing techniques, ocular surface temperature measurement, three different approaches to identifying abnormalities, and different evaluation metrics used. Our review also delves into recent advancements, particularly the integration of machine learning and deep learning algorithms into IRT-based eye examinations. Our systematic review not only sheds light on the current state of research but also outlines promising future prospects for the integration of infrared thermography in advancing eye health diagnostics and care.


Subject(s)
Eye Diseases , Infrared Rays , Thermography , Humans , Thermography/methods , Eye Diseases/diagnosis , Eye Diseases/diagnostic imaging , Eye/diagnostic imaging , Machine Learning , Body Temperature
2.
Sensors (Basel) ; 24(9)2024 Apr 24.
Article in English | MEDLINE | ID: mdl-38732804

ABSTRACT

In general, it is difficult to visualize internal ocular structure and detect a lesion such as a cataract or glaucoma using the current ultrasound brightness-mode (B-mode) imaging. This is because the internal structure of the eye is rich in moisture, resulting in a lack of contrast between tissues in the B-mode image, and the penetration depth is low due to the attenuation of the ultrasound wave. In this study, the entire internal ocular structure of a bovine eye was visualized in an ex vivo environment using the compound acoustic radiation force impulse (CARFI) imaging scheme based on the phase-inverted ultrasound transducer (PIUT). In the proposed method, the aperture of the PIUT is divided into four sections, and the PIUT is driven by the out-of-phase input signal capable of generating split-focusing at the same time. Subsequently, the compound imaging technique was employed to increase signal-to-noise ratio (SNR) and to reduce displacement error. The experimental results demonstrated that the proposed technique could provide an acoustic radiation force impulse (ARFI) image of the bovine eye with a broader depth-of-field (DOF) and about 80% increased SNR compared to the conventional ARFI image obtained using the in-phase input signal. Therefore, the proposed technique can be one of the useful techniques capable of providing the image of the entire ocular structure to diagnose various eye diseases.


Subject(s)
Elasticity Imaging Techniques , Eye , Signal-To-Noise Ratio , Transducers , Animals , Cattle , Eye/diagnostic imaging , Elasticity Imaging Techniques/methods , Ultrasonography/methods
3.
J Craniofac Surg ; 35(4): 1143-1145, 2024 Jun 01.
Article in English | MEDLINE | ID: mdl-38709070

ABSTRACT

INTRODUCTION: It is important to generate predictable statistical models by increasing the number of variables on the human skeletal and soft tissue structures on the face to increase the accuracy of human facial reconstructions. The purpose of this study was to determine mouth width 3-dimensionally based on statistical regression model. MATERIAL AND METHODS: Cone-beam computed tomography scan data from 130 individuals were used to measure the horizontal and vertical dimensions of orbital and nasal structures and intercanine width. The correlation between these hard tissue variables and the mouth width was evaluated using the statistical regression model. RESULTS: Orbital width, nasal width, and intercanine width were found to be strong predictors of the mouth width determination and were used to generate the regression formulae to find the most approximate position of the mouth. CONCLUSION: These specific variables may contribute to improving the accuracy of mouth width determination for oral and maxillofacial reconstructions.


Subject(s)
Face , Mandibular Reconstruction , Mouth , Regression Analysis , Mouth/anatomy & histology , Mouth/diagnostic imaging , Face/anatomy & histology , Face/diagnostic imaging , Tooth/anatomy & histology , Tooth/diagnostic imaging , Eye/anatomy & histology , Eye/diagnostic imaging , Nose/anatomy & histology , Nose/diagnostic imaging , Cone-Beam Computed Tomography , Humans
4.
Sci Rep ; 14(1): 9952, 2024 04 30.
Article in English | MEDLINE | ID: mdl-38688983

ABSTRACT

We investigated three-dimensional (3D) eyeball protrusion and its association with the offset between the lamina cribrosa (LC) and Bruch's membrane opening (BMO). 3D-MRI scans were taken from 93 subjects (186 eyes). An ellipsoid was fitted along the posterior 2/3 contour of each eyeball. Eyeball asymmetry with focal bulging was determined by the existence of an adjacent outward protrusion/reciprocal inward depression pair, and the angular deviation of the outermost protruded point (OPP) was measured from the nasal side of the fovea-BMO axis. The LC/BMO offset was evaluated by measuring the central retinal vascular trunk (CRVT) location from the BMO center: (1) the angular deviation and (2) the offset index as the ratio between the CRVT-BMO center distance and the BMO radius in the same direction. Seventy-nine eyes (42%) were classified as having eyeball asymmetry, which had a more superior LC/BMO offset (P < 0.001) and a larger offset index (P = 0.002). In those eyes, the angular deviation of the OPP showed a significant correlation with that of the LC/BMO offset (r = -0.724, P < 0.001), as did protrusion depth with the offset index (r = 0.291, P = 0.009). The presence of eyeball asymmetry was associated with superior LC/BMO offset (P = 0.004) and larger offset index (P = 0.009). Superior LC/BMO offset was associated with older age (P < 0.001), shorter axial length (P < 0.001) and inferior location of OPP (P < 0.001). The location and extent of focal bulging were closely associated with those of LC/BMO offset. This indicates that focal bulging during expansion might be associated with diverse directionality of LC/BMO offset.


Subject(s)
Optic Disk , Humans , Male , Female , Middle Aged , Optic Disk/diagnostic imaging , Adult , Aged , Magnetic Resonance Imaging , Eye/diagnostic imaging , Eye/pathology , Bruch Membrane/pathology , Imaging, Three-Dimensional , Young Adult , Tomography, Optical Coherence/methods
5.
Exp Eye Res ; 243: 109914, 2024 Jun.
Article in English | MEDLINE | ID: mdl-38685338

ABSTRACT

A-scan ultrasonography enables precise measurement of internal ocular structures. Historically, its use has underpinned fundamental studies of eye development and aberrant eye growth in animal models of myopia; however, the procedure typically requires anaesthesia. Since anaesthesia affects intra-ocular pressure (IOP), we investigated changes in internal ocular structures with isoflurane exposure and compared measurements with those taken in awake animals using optical coherence tomography (OCT). Continuous A-scan ultrasonography was undertaken in tri-coloured guinea pigs aged 21 (n = 5), 90 (n = 5) or 160 (n = 5) days while anaesthetised (up to 36 min) with isoflurane (5% in 1.5L/min O2). Peaks were selected from ultrasound traces corresponding to the boundaries of the cornea, crystalline lens, retina, choroid and sclera. OCT scans (Zeiss Cirrus Photo 800) of the posterior eye layers were taken in 28-day-old animals (n = 19) and compared with ultrasound traces, with choroid and scleral thickness adjusted for the duration of anaesthesia based on the changes modelled in 21-day-old animals. Ultrasound traces recorded sequentially in left and right eyes in 14-day-old animals (n = 30) were compared, with each adjusted for anaesthesia duration. The thickness of the cornea was measured in enucleated eyes (n = 5) using OCT following the application of ultrasound gel (up to 20 min). Retinal thickness was the only ultrasound internal measure unaffected by anaesthesia. All other internal distances rapidly changed and were well fitted by exponential functions (either rise-to-max or decay). After 10 and 20 min of anaesthesia, the thickness of the cornea, crystalline lens and sclera increased by 17.1% and 23.3%, 0.4% and 0.6%, and 5.2% and 6.5% respectively, whilst the anterior chamber, vitreous chamber and choroid decreased by 4.4% and 6.1%, 0.7% and 1.1%, and 10.7% and 11.8% respectively. In enucleated eyes, prolonged contact of the cornea with ultrasound gel resulted in an increase in thickness of 9.3% after 10 min, accounting for approximately half of the expansion observed in live animals. At the back of the eye, ultrasound measurements of the thickness of the retina, choroid and sclera were highly correlated with those from posterior segment OCT images (R2 = 0.92, p = 1.2 × 10-13, R2 = 0.55, p = 4.0 × 10-4, R2 = 0.72, p = 5.0 × 10-6 respectively). Furthermore, ultrasound measures for all ocular components were highly correlated in left and right eyes measured sequentially, when each was adjusted for anaesthetic depth. This study shows that the depth of ocular components can change dramatically with anaesthesia. Researchers should therefore be wary of these concomitant effects and should employ adjustments to better render 'true' values.


Subject(s)
Anesthetics, Inhalation , Isoflurane , Tomography, Optical Coherence , Ultrasonography , Animals , Tomography, Optical Coherence/methods , Guinea Pigs , Isoflurane/pharmacology , Anesthetics, Inhalation/pharmacology , Choroid/drug effects , Choroid/diagnostic imaging , Aging/physiology , Intraocular Pressure/drug effects , Intraocular Pressure/physiology , Cornea/drug effects , Cornea/diagnostic imaging , Retina/drug effects , Retina/diagnostic imaging , Sclera/drug effects , Sclera/diagnostic imaging , Time Factors , Eye/diagnostic imaging , Eye/drug effects , Disease Models, Animal , Lens, Crystalline/diagnostic imaging , Lens, Crystalline/drug effects
6.
Sci Rep ; 14(1): 6787, 2024 03 21.
Article in English | MEDLINE | ID: mdl-38514709

ABSTRACT

The aim of this study was to investigate the anatomical and physiological ocular parameters in adolescents with myopia and to examine the relations between refractive error (SER), ocular biometry, body size and flexibility parameters in myopic adolescents. A cross-sectional study of 184 myopic adolescents, aged 15 to 19 years was conducted. Refractive error and corneal curvature measures of the eye were evaluated using an autorefractometer under cycloplegia. Central corneal thickness was determined by contact pachymetry. The ocular axial length, anterior and vitreous chamber depth, and lens thickness were measured using A-scan biometry ultrasonography. Height and body weight were measured according to a standardized protocol. Body mass index (BMI) was subsequently calculated. Beighton scale was used to measure joint flexibility. Body stature was positively correlated with ocular axial length (r = 0.39, p < 0.001) and vitreous chamber depth (r = 0.37, p < 0.001). There was a negative correlation between height and SER (r = - 0.46; p < 0.001). Beighton score and body weight had weak positive correlations with axial length and vitreous chamber depth, and a weak negative correlation with SER. A significantly more negative SER was observed in the increased joint mobility group (p < 0.05; U = 5065.5) as compared to normal joint mobility group: mean - 4.37 ± 1.85 D (median - 4.25; IQR - 6.25 to - 3.25 D) and mean - 3.72 ± 1.66 D (median - 3.50; IQR - 4.75 to - 2.25 D) respectively. There was a strong association between height and axial length, as well as SER. Higher degree of myopia significantly correlated with greater Beighton score (increased joint mobility).


Subject(s)
Myopia , Refractive Errors , Adolescent , Humans , Cross-Sectional Studies , Eye/diagnostic imaging , Biometry , Body Weight , Anterior Eye Segment , Refraction, Ocular , Anterior Chamber/diagnostic imaging , Anterior Chamber/anatomy & histology , Axial Length, Eye/diagnostic imaging
7.
J Biophotonics ; 17(5): e202300562, 2024 May.
Article in English | MEDLINE | ID: mdl-38348513

ABSTRACT

Dispersion mismatch of optical coherence tomography (OCT), caused by inherent dispersion of biological sample, leads to axial resolution degradation and image blurring. However, the dispersion of biological samples may carry characteristic information of itself. Therefore, it is useful and important to extract dispersion as an additional parameter of biological samples. Here, we study and compare five categories of conventional OCT dispersion extraction methods first. The results show that the iterative method has the best accuracy and stability. Furthermore, we propose an improved iterative method, which achieves higher accuracy and stability in simulation compared with conventional methods. Then, the dispersion values of optical glasses are extracted experimentally utilizing the proposed method. The extracted values are consistent well with reference values. Furthermore, we apply the proposed method for extracting the dispersion characteristics of zebrafish eye. With the proposed method, OCT-based analysis of dispersion characteristics could be a powerful tool in clinical practice.


Subject(s)
Image Processing, Computer-Assisted , Tomography, Optical Coherence , Zebrafish , Tomography, Optical Coherence/methods , Animals , Image Processing, Computer-Assisted/methods , Eye/diagnostic imaging
8.
J Vet Med Sci ; 86(3): 308-311, 2024 Mar 16.
Article in English | MEDLINE | ID: mdl-38171740

ABSTRACT

This study aimed to describe the computed tomographic (CT) dimensions and the contrast attenuation of the eye in Jeju horses and Thoroughbreds. We evaluated the CT images of 10 Jeju horses and 6 Thoroughbreds without ocular abnormalities to assess the ocular dimensions and contrast attenuation. The following measurements showed significant differences between Jeju horses and Thoroughbreds (P<0.05): the diameters of the lens, globe, posterior segment, orbital fossa, and lateromedial distance of the anterior chamber; and the Hounsfield units of the vitreous body. This study describes the CT anatomical characteristics of Jeju horses and Thoroughbreds and the differences between the two breeds and provides useful information for understanding and evaluating of the eyes of Jeju horses through a CT scan.


Subject(s)
Anterior Chamber , Vitreous Body , Animals , Horses , Tomography, X-Ray Computed/veterinary , Eye/diagnostic imaging
9.
Biomed Tech (Berl) ; 69(3): 307-315, 2024 Jun 25.
Article in English | MEDLINE | ID: mdl-38178615

ABSTRACT

OBJECTIVES: Optical coherence tomography (OCT) is a new imaging technology that uses an optical analog of ultrasound imaging for biological tissues. Image segmentation plays an important role in dealing with quantitative analysis of medical images. METHODS: We have proposed a novel framework to deal with the low intensity problem, based on the labeled patches and Bayesian classification (LPBC) model. The proposed method includes training and testing phases. During the training phase, firstly, we manually select the sub-images of background and Region of Interest (ROI) from the training image, and then extract features by patches. Finally, we train the Bayesian model with the features. The segmentation threshold of each patch is computed by the learned Bayesian model. RESULTS: In addition, we have collected a new dataset of mouse eyes in vivo with OCT, named MEVOCT, which can be found at URL https://17861318579.github.io/LPBC. MEVOCT consists of 20 high-resolution images. The resolution of every image is 2048 × 2048 pixels. CONCLUSIONS: The experimental results demonstrate the effectiveness of the LPBC method on the new MEVOCT dataset. The ROI segmentation is of great importance for the distortion correction.


Subject(s)
Bayes Theorem , Tomography, Optical Coherence , Tomography, Optical Coherence/methods , Animals , Mice , Algorithms , Image Processing, Computer-Assisted/methods , Eye/diagnostic imaging
10.
Comput Biol Med ; 168: 107771, 2024 01.
Article in English | MEDLINE | ID: mdl-38070200

ABSTRACT

Thyroid-associated ophthalmopathy (TAO) is an organ-specific autoimmune disease that seriously affects patient's life and health. However, the early diagnosis of TAO is highly dependent on the physician's subjective experience. Moreover, the currently proposed deep learning networks for eye diseases do not provide robust interpretability concerning feature learning paradigm, model structure, and the number of neurons. But the mentioned components are very important for model interpretability and are key factors that severely affect the transparency of the model. Therefore, a robust interpretable multi-orientation visual recognition network (IMoVR-Net) for TAO multi-ocular lesion recognition is proposed in this paper. Firstly, a multi-orientation visual cascaded encoder composed of the DenseGabor module and the dilated Gabor convolution group is proposed to achieve the fine extraction of multi-directional TAO lesion features by using a novel feature learning paradigm called alternating filtering. Besides, combining information theory and topology tool, an optimization rule based on topological energy entropy is proposed to provide a solid interpretable theory for determining the model structure. Finally, a clustering correlation analysis method is developed to accomplish the determination of the number of convolutional hidden neurons, providing robust interpretability for the selection of the number of neurons. Compared to other advanced models, the IMoVR-Net achieved state-of-the-art performance on different TAO ocular datasets with an average accuracy, sensitivity, precision, and F1 score of 0.878, 87.27 %, 0.875, and 87.39 %, respectively. The IMoVR-Net has good clinical application prospects due to its strong recognition ability and robust interpretability in feature extraction paradigm, model structure, and number of convolutional neurons.


Subject(s)
Autoimmune Diseases , Graves Ophthalmopathy , Humans , Eye/diagnostic imaging , Face , Cluster Analysis
11.
Invest Ophthalmol Vis Sci ; 64(15): 41, 2023 Dec 01.
Article in English | MEDLINE | ID: mdl-38153751

ABSTRACT

Purpose: The purpose of this study was to determine the association between eye shape and volume measured with magnetic resonance imaging (MRI) and optical biometry and with spherical equivalent (SE) in children. Methods: For this study, there were 3637 10-year-old children from a population-based birth-cohort study that underwent optical biometry (IOL-master 500) and T2-weighted MRI scanning (height, width, and volume). Cycloplegic refractive error was determined by automated refraction. The MRI images of the eyes were segmented using an automated algorithm combining atlas registration with voxel classification. Associations among optical biometry, anthropometry, MRI measurements, and RE were tested using Pearson correlation. Differences between refractive error groups were tested using ANOVA. Results: The mean volume of the posterior segment was 6350 (±680) mm3. Myopic eyes (SE ≤ -0.5 diopters [D]) had 470 mm3 (P < 0.001) and 970 mm3 (P < 0.001) larger posterior segment volume than emmetropic and hyperopic eyes (SE ≥ +2.0D), respectively. The majority of eyes (77.1%) had an oblate shape, but 47.4% of myopic eyes had a prolate shape versus 3.9% of hyperopic eyes. The correlation between SE and MRI-derived posterior segment length (r -0.51, P < 0.001) was stronger than the correlation with height (r -0.30, P < 0.001) or width of the eye (r -0.10, P < 0.001). Conclusions: In this study, eye shape at 10 years of age was predominantly oblate, even in eyes with myopia. Of all MRI measurements, posterior segment length was most prominently associated with SE. Whether eye shape predicts future myopia development or progression should be investigated in longitudinal studies.


Subject(s)
Hyperopia , Myopia , Refractive Errors , Child , Humans , Cohort Studies , Eye/diagnostic imaging , Magnetic Resonance Imaging , Myopia/diagnosis
12.
Emerg Med J ; 40(12): 825-859, 2023 Nov 28.
Article in English | MEDLINE | ID: mdl-38016724
13.
Invest Ophthalmol Vis Sci ; 64(12): 8, 2023 09 01.
Article in English | MEDLINE | ID: mdl-37669062

ABSTRACT

Purpose: The purpose of this study was to investigate the relation among hyperautofluorescent ring patterns, visual acuity (VA), and optical coherence tomography (OCT) features in patients with retinitis pigmentosa (RP), and to describe its modifications over time. Methods: This was a retrospective, longitudinal, and observational study. Clinical and imaging data from the first and last available visits of patients with a clinical diagnosis of RP were reviewed. The ellipsoid zone (EZ) width was measured on OCT acquisitions. Short-wavelength autofluorescence (SW-AF) images were classified based on the hyperautofluorescent ring pattern as absent, regular, and irregular, and their modifications over the follow-up were described. The VA, EZ width, and progression rate were compared among the three groups. Results: One hundred eight eyes from 54 subjects were included in the study. The hyperautofluorescent ring was not present in 28 eyes (25.9%), appeared regular in 45 eyes (41.7%), and had an irregular pattern in 35 eyes (32.4%). The three groups differed in terms of age, VA, and EZ width (all P < 0.05). Additionally, the absence of a hyperautofluorescent ring indicated a faster rate of progression (P < 0.001). Throughout the follow-up period, 17 eyes (15.7%) experienced a change in the AF pattern, with irregular rings being more commonly affected. Conclusions: The hyperautofluorescent ring is a useful tool to frame patients based on their EZ width and VA. We described its possible modifications over time, the knowledge of which can aid clinicians in the interpretation of imaging finding changes of their patients.


Subject(s)
Eye , Retinitis Pigmentosa , Tomography, Optical Coherence , Humans , Eye/diagnostic imaging , Longitudinal Studies , Retinitis Pigmentosa/diagnosis , Retrospective Studies , Tomography, Optical Coherence/methods , Visual Acuity , Male , Female , Adult
15.
West J Emerg Med ; 24(3): 622-628, 2023 May 05.
Article in English | MEDLINE | ID: mdl-37278794

ABSTRACT

INTRODUCTION: Point-of-care ultrasound (POCUS) plays a pivotal role in evaluating ocular complaints in the emergency department (ED). The rapid and non-invasive nature of ocular POCUS makes it a safe and informative imaging modality. Previous studies have investigated using ocular POCUS to diagnose posterior vitreous detachment (PVD), vitreous hemorrhage (VH), and retinal detachment (RD); however, there are few studies that assess image optimization techniques and how they impact the overall accuracy of ocular POCUS. METHODS: We performed a retrospective review of ED patients who received ocular POCUS examinations and ophthalmology consultations as part of their evaluation for eye complaints at our urban, Level I trauma center ED from November 2017-January 2021. Of 706 exams, 383 qualified for the study. In this study we primarily investigated how stratified gain levels impact the accuracy of ocular POCUS for detection of any posterior chamber pathology and, secondarily, whether stratified gain levels impact the accuracy of detecting RD, VH, and PVD specifically. RESULTS: The images were found to have an overall sensitivity of 81% (76-86%), specificity of 82% (76-88%), positive predictive value (PPV) of 86% (81-91%), and negative predictive value (NPV) of 77% (70-83%). Images acquired with a gain of (25, 50] had a sensitivity of 71% (61-80%), specificity of 95% (85-99%), PPV of 96% (88-99%), and NPV of 68% (56-78%). Images acquired with a gain of (50, 75] had a sensitivity of 85% (73-93%), specificity of 85% (72-93%), PPV of 86% (75-94%), and NPV of 83% (70-92%). Images acquired with a high gain (75, 100] had a sensitivity of 91% (82-97%), specificity of 67% (53-79%), PPV of 78% (68-86%), and NPV of 86% (72-95%). CONCLUSION: In the ED setting, high (75, 100] gain on ocular POCUS scanning has a higher degree of sensitivity for detecting any posterior chamber abnormality, as compared to low (25, 50] gain levels. Thus, incorporating the use of high gain for ocular POCUS exams produces a more effective tool for ocular pathologies in acute care settings and may be particularly valuable in resource-limited settings.


Subject(s)
Retinal Detachment , Vitreous Detachment , Humans , Point-of-Care Systems , Sensitivity and Specificity , Ultrasonography/methods , Eye/diagnostic imaging , Retinal Detachment/diagnostic imaging , Emergency Service, Hospital
16.
Arch. Soc. Esp. Oftalmol ; 98(6): 329-337, jun. 2023. ilus
Article in Spanish | IBECS | ID: ibc-221224

ABSTRACT

Antecedentes y objetivo El objetivo es analizar la densidad vascular (DV) coroidea en individuos sanos y compararla con el grosor coroideo (GC). Materiales y métodos Estudio transversal incluyendo individuos entre 18 y 35 años, caucásicos y con longitud axial (LA) 21-26 mm. Se estudió la coroides con tomografía de coherencia óptica-angiografía (OCTA) Triton DRI (Topcon) y se obtuvo un cubo macular de 6x6 mm. El software dio los valores de GC automáticamente. Los valores de DV se obtuvieron mediante codificación en números de los colores de los mapas de DV. Resultados Se analizaron 102 ojos (51 pacientes). La edad media fue 27,32 ± 3,94 años, la presión intraocular media fue 18,07 ± 2,38 mmHg, y la LA media fue 23,71 ± 0,66 mm. El GC fue mayor en el eje vertical y menor al acercarse a los lados nasal y temporal. El mayor GC se encontró en la mácula superior. La mayor DV coroidea fue en la fóvea y en la región yuxtapapilar. La menor DV coroidea se halló en la mácula superior e inferior. Se encontraron correlaciones moderadas inversas entre GC y DV coroidea en las regiones yuxtapapilar e inferior. Conclusiones La coroides tiene un patrón de grosor diferente del de la retina. Los vasos coroideos representan un porcentaje muy alto de la coroides en las regiones peripapilar y fóvea. Por el contrario, la mácula superior e inferior muestra valores bajos de DV (AU)


Background and purpose The purpose is to analyze choroidal vascular density (VD) in healthy individuals and to compare it with choroidal thickness (CT). Materials and methods Cross-sectional study enrolling healthy individuals between 18 and 35 years old of Caucasian race and with an axial length (AL) 21–26 mm. Choroid was imaged with swept-source optical coherence tomography angiography (OCTA) Triton DRI (Topcon) and a macular cube of 6 mm × 6 mm was obtained. CT values were automatically given by the software. VD values were obtained through codifying colors of the VD map into numbers. Results One hundred and two (51 patients) were analyzed. Mean age was 27.32 ± 3.94 years old, mean intraocular pressure was 18.07 ± 2.38 mmHg, and mean AL was 23.71 ± 0.66 mm. CT was higher in the vertical axis and lower when approaching nasal and temporal sides. The highest CT was in superior macula. The highest choroidal VD were in the fovea and in the juxtapapillary region. The lowest choroidal VD were found in superior and inferior macular areas. Moderate inverse correlations between CT and choroidal VD were found in the juxtapapillary and inferior regions. Conclusions The choroid has a thickness pattern that differs from retina. Choroidal vessels represent a very high percentage of choroid in the peripapillary region and in the fovea. On the contrary, superior and inferior macula reveals low values of VD (AU)


Subject(s)
Humans , Male , Female , Adolescent , Young Adult , Adult , Choroid/anatomy & histology , Choroid/diagnostic imaging , Eye/blood supply , Eye/diagnostic imaging , Tomography, Optical Coherence , Healthy Volunteers , Reference Values
17.
Biomed Eng Online ; 22(1): 49, 2023 May 19.
Article in English | MEDLINE | ID: mdl-37208715

ABSTRACT

PURPOSE: To provide a summary of the research advances on ocular images-based artificial intelligence on systemic diseases. METHODS: Narrative literature review. RESULTS: Ocular images-based artificial intelligence has been used in a variety of systemic diseases, including endocrine, cardiovascular, neurological, renal, autoimmune, and hematological diseases, and many others. However, the studies are still at an early stage. The majority of studies have used AI only for diseases diagnosis, and the specific mechanisms linking systemic diseases to ocular images are still unclear. In addition, there are many limitations to the research, such as the number of images, the interpretability of artificial intelligence, rare diseases, and ethical and legal issues. CONCLUSION: While ocular images-based artificial intelligence is widely used, the relationship between the eye and the whole body should be more clearly elucidated.


Subject(s)
Artificial Intelligence , Deep Learning , Eye/diagnostic imaging , Face , Kidney
18.
Exp Biol Med (Maywood) ; 248(5): 371-379, 2023 05.
Article in English | MEDLINE | ID: mdl-37212384

ABSTRACT

Due to its accessibility and ability for real-time image acquisition of ocular structures, ultrasound has high utility in the visualization of the eye, especially in ocular oncology. In this minireview, we summarize the technical rationale and applications of ultrasound modalities, A-scan, B-scan, high-frequency ultrasound biomicroscopy (UBM), and Doppler measurement. A-scan ultrasound uses a transducer of 7-11 MHz, making it useful for determining the echogenicity of ocular tumors (7-8 MHz) and measuring the axial length of the eye (10-11 MHz). B-scan ultrasound operates at 10-20 MHz, which can be used for measuring posterior ocular tumors while UBM operates at 40-100 MHz to evaluate anterior ocular structures. Doppler ultrasonography allows for the detection of tumor vascularization. While ultrasonography has numerous clinical applications due to its favorable penetration compared with optical coherence tomography, it is still limited by its relatively lower resolution. Ultrasound also requires an experienced sonographer due to the need for accurate probe localization to areas of interest.


Subject(s)
Eye Diseases , Neoplasms , Humans , Eye/diagnostic imaging , Ultrasonography , Eye Diseases/diagnostic imaging , Tomography, Optical Coherence
19.
Childs Nerv Syst ; 39(12): 3551-3560, 2023 Dec.
Article in English | MEDLINE | ID: mdl-37010582

ABSTRACT

BACKGROUND: Optic nerve sheath diameter (ONSD) measurement is a noninvasive method that can be used for intracranial pressure monitoring. Several studies have investigated normal ONSD values in children, but no general consensus has been reached yet. OBJECTIVES: The aim of our study was to reveal normal ONSD, eyeball transverse diameter (ETD), and ONSD/ETD values on brain computed tomography (CT) in healthy children aged 1 month to 18 years. METHODS: Children admitted to the emergency department with minor head trauma and had normal brain CT were included in the study. The demographic characteristics of the patients (age and sex) were recorded, and the patients were divided into four age groups: 1 month to 2 years, 2 to 4 years, 4 to 10 years, and 10 to 18 years. RESULTS: The images of 332 patients were analyzed. When the median values of all measurement parameters (right and left ONSD, ETD, and ONSD/ETD) were compared between the right and left eyes, no statistically significant differences were found. When the same parameters were compared according to age group, the ONSD and ETD values differed significantly (values of males were found to be higher), but the ONSD proximal/ETD and ONSD middle/ETD values did not differ significantly. CONCLUSION: In our study, normal ONSD, ETD, and ONSD/ETD values were determined according to age and sex in healthy children. As the ONSD/ETD index did not statistically significantly differ according to age and sex, diagnostic studies for traumatic brain injuries can be performed using the index.


Subject(s)
Brain Injuries, Traumatic , Intracranial Hypertension , Male , Humans , Child , Intracranial Pressure/physiology , Optic Nerve/diagnostic imaging , Eye/diagnostic imaging , Brain Injuries, Traumatic/diagnostic imaging , Tomography, X-Ray Computed , Ultrasonography
20.
Vet Res Commun ; 47(3): 1479-1491, 2023 Sep.
Article in English | MEDLINE | ID: mdl-36941479

ABSTRACT

There is a lack of reports describing ultrasonographic and histopathologic features of ocular diseases in donkeys. The present study aimed to document ultrasonographic and histopathologic changes associated with common ocular diseases in donkeys. The study included 45 donkeys (64 eyes) with ocular diseases that had reached the end of their working lives and requested to be used for educational and research purposes. Complete clinical, ophthalmic, ultrasonographic, gross pathologic and histopathologic examinations were included. Ocular abnormalities were documented, tabulated, and analyzed. Seventy-five ocular abnormalities were diagnosed with multiple involvements within the same eye including anterior uveitis (n = 13; 22.8%), cataract (n = 57; 76%), retinal detachment (n = 3; 4%), lens and phthisis bulbi (n = 2; 2.6%). Descriptive ultrasonographic findings of ocular abnormalities were included. Gross pathologic and histopathology findings confirmed the ultrasonography findings. Ultrasonography provided a clinically useful tool offering insight into detailed intraocular structures especially with opacification of the dioptric structures of the eye.


Subject(s)
Equidae , Horse Diseases , Animals , Horses , Eye/diagnostic imaging , Ultrasonography/veterinary
SELECTION OF CITATIONS
SEARCH DETAIL
...