Department of Psychology, University of Minnesota, Minneapolis, Minnesota, United States.
Laboratoire de Psychologie Cognitive, Aix-Marseille University, Marseille, France.
Invest Ophthalmol Vis Sci. 2018 Oct 1;59(12):4798-4803. doi: 10.1167/iovs.18-24716.
Most people with low vision experience difficulty with reading. Reading assessment can provide guidance for prescription of reading aids and strategies for reading rehabilitation. Here we investigate the effectiveness of letter acuity (LA) and reading acuity (RA) as predictors of low-vision reading performance.
Low-vision subjects (n = 58), young control subjects (n = 52), and older control subjects (n = 14) participated in this study. The low-vision subjects were separated into a Macular group (n = 30) and a Nonmacular group (n = 28) based on whether the diagnoses primarily affected the macular area. LA was measured with the Lighthouse Distance Visual Acuity Chart and RA with the MNREAD Acuity Chart. Reading speeds were obtained across a range of print sizes from the MNREAD test. The MNREAD data were used to estimate required print sizes for three functionally important types of reading for each subject: spot reading (40 words/min [wpm]), fluent reading (80 wpm), and critical print size (required to achieve maximum reading speed).
For equal values of LA, the Macular group had significantly worse RA than the Nonmacular group. The differences between vision groups, as well as individual variations within groups, were largely explained by the differences in RA. RA is a better predictor than LA for spot reading size, fluent reading size, and critical print size.
RA may provide more accurate assessment of reading performance than LA for purposes of low-vision reading rehabilitation.
大多数低视力人群在阅读方面存在困难。阅读评估可以为阅读辅助器具的处方和阅读康复策略提供指导。在这里，我们研究了字母视力（LA）和阅读视力（RA）作为低视力阅读表现预测因子的有效性。
低视力受试者（n=58）、年轻对照组受试者（n=52）和老年对照组受试者（n=14）参与了这项研究。低视力受试者根据诊断是否主要影响黄斑区域，分为黄斑组（n=30）和非黄斑组（n=28）。LA 用灯塔远视力表测量，RA 用 MNREAD 视力表测量。MNREAD 测试获得了一系列不同大小的印刷品的阅读速度。MNREAD 数据用于估计每位受试者三种功能重要的阅读类型所需的印刷品大小：点读（40 个单词/分钟[wpm]）、流畅阅读（80 wpm）和临界印刷尺寸（获得最大阅读速度所需的尺寸）。
对于相等的 LA 值，黄斑组的 RA 明显低于非黄斑组。视力组之间的差异以及组内个体差异在很大程度上可以用 RA 的差异来解释。RA 是点读尺寸、流畅阅读尺寸和临界印刷尺寸的更好预测因子。
RA 可能比 LA 更能准确评估低视力阅读康复的阅读表现。
