Simulating Visibility and Reading Performance in Low Vision.
Simulating Visibility and Reading Performance in Low Vision.
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DOI：
10.3389/fnins.2021.671121
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发表时间：
2021
影响因子：
4.3
通讯作者：
Legge GE
中科院分区：
文献类型：
--
作者：
Xiong YZ;Lei Q;Calabrèse A;Legge GE
视力低下会降低文本可见度并导致阅读困难。有效的低视力模拟可用于评估低视力读者对数字文本的可访问性。我们检查了数字模拟复制低视力个体文本可见性和阅读表现的有效性。低视力能见度通过对比敏感度函数 (CSF) 进行建模，其参数代表降低的敏锐度和对比敏感度。结合这些 CSF 的数字过滤被应用于 Lighthouse Letter 敏锐度图和 Pelli-Robson 对比敏感度图的数字版本。阅读性能（阅读敏锐度、临界打印尺寸和最大阅读速度）通过 MNREAD 阅读敏锐度图表的过滤版本进行评估。三十六名视力正常的年轻人在正常和模拟低视力条件下完成了图表测试。五十八名低视力受试者（三十名患有黄斑病理，二十八名患有非黄斑病理）和十五名视力正常的老年受试者以其习惯性观看完成了图表测试。我们假设视力正常的年轻人在模拟低视力条件下的表现将与实际低视力受试者的相应表现相匹配。当模拟视力优于 1.50 logMAR (Snellen 20/630) 且对比敏感度优于 0.15 log 单位的低视力条件时，模拟将视力正常的年轻受试者的敏锐度和对比敏感度充分降低至所需的低视力水平。当进行模拟低视力的 MNREAD 测试时，视力正常的年轻人的最大阅读速度比非黄斑组和黄斑组更快，平均每分钟分别快 0.07 和 0.12 个对数单词。然而，他们充分复制了两个低视力群体的阅读敏锐度和临界印刷尺寸，高达 2.00 logMAR。基于视敏度和对比敏感度的临床测量的低视力模拟可以为各种低视力条件下的阅读性能和数字文本的可访问性提供良好的估计。
Low vision reduces text visibility and causes difficulties in reading. A valid low-vision simulation could be used to evaluate the accessibility of digital text for readers with low vision. We examined the validity of a digital simulation for replicating the text visibility and reading performance of low-vision individuals. Low-vision visibility was modeled with contrast sensitivity functions (CSFs) with parameters to represent reduced acuity and contrast sensitivity. Digital filtering incorporating these CSFs were applied to digital versions of the Lighthouse Letter Acuity Chart and the Pelli-Robson Contrast Sensitivity Chart. Reading performance (reading acuity, critical print size, and maximum reading speed) was assessed with filtered versions of the MNREAD reading acuity Chart. Thirty-six normally sighted young adults completed chart testing under normal and simulated low-vision conditions. Fifty-eight low-vision subjects (thirty with macular pathology and twenty-eight with non-macular pathology) and fifteen normally sighted older subjects completed chart testing with their habitual viewing. We hypothesized that the performance of the normally sighted young adults under simulated low-vision conditions would match the corresponding performance of actual low-vision subjects. When simulating low-vision conditions with visual acuity better than 1.50 logMAR (Snellen 20/630) and contrast sensitivity better than 0.15 log unit, the simulation adequately reduced the acuity and contrast sensitivity in normally sighted young subjects to the desired low-vision levels. When performing the MNREAD test with simulated low vision, the normally sighted young adults had faster maximum reading speed than both the Non-macular and Macular groups, by an average of 0.07 and 0.12 log word per minute, respectively. However, they adequately replicated the reading acuity as well as the critical print size, up to 2.00 logMAR of both low-vision groups. A low-vision simulation based on clinical measures of visual acuity and contrast sensitivity can provide good estimates of reading performance and the accessibility of digital text for a broad range of low-vision conditions.
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将MNRead Ipad应用程序上的性能与MNRead Acuity图表进行比较。
影响因子：
1.8
作者：
Calabrèse A;To L;He Y;Berkholtz E;Rafian P;Legge GE
通讯作者：
Legge GE
影响因子：
5.5
作者：
CAMPBELL, FW;ROBSON, JG
通讯作者：
ROBSON, JG
影响因子：
3
作者：
Njeru SM;Osman M;Brown AM
通讯作者：
Brown AM
影响因子：
1.8
作者：
LEGGE, GE;RUBIN, GS;SCHLESKE, MM
通讯作者：
SCHLESKE, MM
影响因子：
2.8
作者：
CHYLACK, LT;JAKUBICZ, G;FRIEND, J
通讯作者：
FRIEND, J