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Objective:To explore the effect of closed skills physical activity with additional dynamic visual task on dynamic visual acuity and static visual acuity for pupils with myopia at grade four at primary school. Methods:In September, 2019, 37 pupils with myopia at grade four in Daicheng Experimental Primary School, Suzhou City were selected. In light of mechanism of refractive system, the intervention of closed-skilled physical activity with dynamic visual task was developed. They were intervened for 16 weeks. The dynamic visual acuity and static visual acuity were measured before intervention, and eight and 16 weeks after intervention. Results:Both dynamic visual acuity and static visual acuity improved significantly in all the pupils with myopia after 16 weeks of intervention (F > 15.933, P < 0.001), both pupils with mild and moderate myopia (|t| > 3.353, P < 0.05). The static visual acuity was better in pupils with moderate myopic than with mild myopia (t = -2.830, P < 0.01). Conclusion:Closed skills physical activity with dynamic visual task could improve the visual acuity of puplis with myopia at grade four at primary school.
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Resumen Presentamos una revisión del tema relativo a la habilidad visual para discriminar detalles sutiles sobre objetos en movimiento (AVD: Agudeza Visual Dinámica), mostrando las diferencias más relevantes, que han sido atribuidas a esta capacidad visual en comparación con la AVE (AV estática). Actualmente, es sabido que la correlación entre AVE y AVD es baja. Además, al medir la AVD no solo evaluamos la mínima separación espacial que el sistema visual puede resolver, sino también la funcionalidad del sistema oculomotor. De este modo, valorar la AVD implica medir la capacidad del ojo como buscador activo de información. Hoy sabemos que la AVD es uno de los mejores indicadores de éxito en ciertas especialidades deportivas (tenis de mesa, baseball, etc.) y que correlaciona negativamente con la siniestralidad en accidentes de tráfico. Entre los factores investigados que producen una reducción significativa de la resolución espacial dinámica destacan: (a) la velocidad del estímulo, afectando tanto a trayectorias verticales como horizontales; (b) el tiempo de exposición del estímulo; (c) la iluminación ambiental; (d) la disminución del contraste y e) la edad del sujeto. Por otra parte, se ha verificado que esta capacidad visual es susceptible de mejorar con el entrenamiento.
Resumo Apresentamos uma revisão do tema referente a habilidade visual para discriminar sutís detalhes diante de objetos em movimento (AVD: Acuidade Visual Dinâmica), mostrando as diferenças mais relevantes, que foram atribuídas a esta capacidade visual em comparação com a AVE (AV estática). Atualmente sabemos que a correlação entre AVE e AVD é baixa. Sendo assim, ao medir a AVD não somente avaliamos a mínima separação espacial que o sistema visual pode resolver, também avaliamos a funcionalidade do sistema oculomotor. Desse modo, para avaliar a AVD requer medir a capacidade do olho como buscador ativo de informação. Hoje sabemos que a AVD é um dos melhores indicadores de êxito em certas especialidades desportivas (tênis de mesa, baseball, etc.) e que se correlaciona negativamente com sinistralidade nos acidentes de trânsito. Entre os fatores investigados que produzem una redução significativa da resolução espacial dinâmica destacam: (a) a velocidade do estímulo, que afeta tanto as trajetórias verticais como horizontais; (b) o tempo de exposição do estímulo; (c) a iluminação ambiental; (d) a diminuição do contraste e (e) a idade do sujeito. Por outro lado, verificou-se que esta capacidade visual é suscetível a melhorar com treinamento.
Abstract We present a review on the visual ability to discriminate fine details of moving objects (DVA: Dynamic Visual Acuity), showing the most relevant differences, which have been attributed to this visual capacity in comparison to SVA (static visual acuity). It is known that the correlation between SVA and DVA is low. Moreover, when DVA is measured, not only the minimum spatial separation that the visual system can resolve is evaluated, but also the functionality of the oculomotor system. Therefore, assessing DVA also involves measuring the ability of the eye to actively seek information. Nowadays, it is known that DVA is one of the best indicators of success in certain sports specialties (table tennis, baseball, etc...) and that it negatively correlates with accident rates in traffic scenarios. The investigated factors that produce a significant reduction in dynamic spatial resolution are: (a) the speed of the stimulus, affecting both vertical and horizontal trajectories; (b) the stimulus exposure time; (c) ambient illumination; (d) reduction in contrast and (e) subject age. Moreover, it has been verified that this visual capacity is likely to improve with training.
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Objective@#Dynamic visual acuity (DVA) is defined as the visual acuity when there are relative movements between subjects and visual targets. The purpose of this study was to discuss the correlation between bedside DVA test and other examinations of vestibular function, and to assess the value of DVA test for clinical diagnosis.@*Methods@#Retrospective analysis of 323 cases with peripheral vestibular disorder, and analyzing the correlation between bedside DVA results and caloric test were performed.@*Results@#Out of these 323 cases, 113 cases showed positive results of DVA.Among these 113 cases with positive DVA test, 109 cases were bilateral or unilateral vestibular function loss according to the results of caloric test or VEMP. The disease with the highest positive rate of DVA was bilateral vestibulopathy(BVP), followed by vestibular neuritis (VN) and profound sudden sensorineural hearing loss (pSSNHL).@*Conclusions@#Bedside DVA is effective to determine the cases with BVP and severe unilateral vestibular function loss.
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Los desórdenes vestibulares como el vértigo con mayor prevalencia en la población afectada pueden diagnosticarse con diferentes herramientas incluido el test de agudeza visual dinámica. Test que a nivel clínico únicamente incluye la monitorización de velocidad de movimiento de rotación de la cabeza sin mayores herramientas que permitan el diagnóstico puntual del canal semicircular horizontal acotado en la dinámica completa del movimiento. En el presente artículo se presenta una herramienta tecnológica completa para el desarrollo del test que permite el sensado de los movimientos de la cabeza en los ejes x, y, z y la interacción con una interfaz gráfica para la evaluación de la agudeza visual con errores encontrados al final de la implementación inferiores al 2% en ángulos de inclinación y flexión y del 4% al 15% para el ángulo máximo de rotación.
Vestibular disorders as the vertigo, with higher prevalence in the affected population, can be diagnosed using different tools including the dynamic vestibular acuity test. Test including at clinical level only the speed motorization of head without more tools to allow the specific diagnose of the horizontal semicircular canal bounded in the complete dynamic of movement. This article present a complete technologic tool to the development of the test, allowing the sensing of head movements in the x, y, z axis and the interaction with a graphical interface to evaluate the visual acuity, with found differences at the end of the implementation lower of 2% in flexion and inclination angles and of 4% to 15% to the maximum rotation angle.
Distúrbios vestibulares como a vertigem, com maior prevalência na população afetada, pode ser diagnosticada através de diferentes ferramentas, incluindo o teste de acuidade vestibular dinâmico. Incluindo o teste a nível clínico somente a motorização velocidade da cabeça sem mais ferramentas para permitir o diagnóstico específico do canal semicircular horizontal delimitada a dinâmica de movimentos. Este artigo apresenta uma ferramenta tecnológica completa para o desenvolvimento do teste, Permitindo que o sensor de movimentos da cabeça nos x, y, eixo z ea interação com uma interface gráfica para avaliar a acuidade visual, com diferenças encontradas no final da Implementação inferior de 2% em ângulos de flexão e de inclinação e de 4% a 15% para o ângulo de rotação máxima.
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Objective To detect the dynamic visual acuity ( DVA) before and after vestibular habituation of subjects in order to optimize the DVA assessment criteria .Methods The vestibular function examination system was applied to the detection of static and dynamic visual function in 16 healthy subjects .Results When the speed of left or right swinging was fast enough , DVA before and after vestibular habituation was different .Conclusion Subjects with vestibular habituation can reduce their sensitivity to the vestibular system , the changes in DVA are better than before habituation , and the vestib-ular function adaptability training may have effect on DVA .
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Background Researches have suggested that the defocus can induce the change of static visual acuity,but whether it produce influence on dynamic visual acuity is not clear.Objective This study was to investigate the impact of myopic defocus on static visual acuity and dynamic visual acuity and explore the essential difierence between static visual acuity and dynamic visual acuity. Methods Forty volunteers were enrolled in this trial.including 20 adults with the age of 27.4±1.64 years and 20 children with the age of 11.70+1.49 years.All the eyes of subjects received regular examined to excluded the eye disease with the best corrected vision of ≥1.0 D,astigmatism of ≤0.75 D and anisometropia ＜1.50 D.+1.00 D,+1.50 D,+2.00 D,+2.50 D slasses were ware respectively for the defocus on the foundation of full correction.Dynamic visual acuity was inspected by using selfmade DVA-I training software.and static visual acuity wag tested by static visual acuity chart (Precision Vision,CAT.NO.2125).This clinical trial complied with the Helsinki Declaration and obtained the approval of Ethic Committee of Wenzhou Medical College.Written informed consent was received from each individual prior to the protocol. Results The dynamic and static visual acuities were gradually decreased with the elevation of defocus (F=506.907,P=0.000).No significant differences were found between static visual acuity and dynamic visual acuity in adult or children at various defocus(P＞0.05).The regression linear analysis showed that a positive correlation between static visual acuity with defoeus(R2=0.819,t=26.72,P=0.000) or dynamic visual acuity with defoeus(R2=0.826,t=27.42,P=0.000).The slope and intercept between defocus with static visual acuity were steeper than that between defocus and dynamic visual acuity (slope:F=34.18,P=0.000;intercept:F=1005.56,P=0.001). Conclusion The effect of defocus on static visual acuity is different from that of dynamic visual acuity.It could be speculated that dynamic visual acuity is related not only to refractive systems but also other factor.