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首页> 外文期刊>Optometry and vision science: official publication of the American Academy of Optometry >Glaucoma and reading: Exploring the effects of contrast lowering of text
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Glaucoma and reading: Exploring the effects of contrast lowering of text

机译：青光眼与阅读：探讨降低文本对比度的效果

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PURPOSE.: Past research has not fully ascertained the extent to which people with glaucoma have difficulties with reading. This study measures change in reading speed when letter contrast is reduced, to test the hypothesis that patients with glaucoma are more sensitive to letter contrast than age-similar visually healthy people. METHODS.: Fifty-three patients with glaucoma [mean age: 66 years (standard deviation: 9)] with bilateral visual field (VF) defects and 40 age-similar visually healthy control subjects [mean age: 69 (standard deviation: 8) years] had reading speeds measured using sets of fixed size, non-scrolling texts on a computer setup that incorporated an eye tracking device. All participants had visual acuity ≥6/9, and they underwent standard tests of visual function including Humphrey 24-2 and 10-2 VFs. Potential non-visual confounders were also tested, including cognitive ability (Middlesex Elderly Assessment of Mental Status Test) and general reading ability. Individual average raw reading speeds were calculated from 8 trials (different passages of text) at both 100% and 20% letter contrast. RESULTS.: Patients had an average 24-2 VF MD of -6.5 (range: 0.7 to -17.3) dB in the better eye. The overall median reduction in reading speed due to decreasing the contrast of the text in the patients was 20%, but with considerable between-individual variation (interquartile range, 8%-44%). This reduction was significantly greater (p = 0.01) than the controls [median: 11% (interquartile range, 6%-17%)]. Patients and controls had similar average performance on Middlesex Elderly Assessment of Mental Status Test (p = 0.71), a modified Burt Reading ability test (p = 0.33), and a computer-based lexical decision task (p = 0.53) and had similar self-reported day-to-day reading frequency (p = 0.12). CONCLUSIONS.: Average reduction in reading speed caused by a difference in letter contrast between 100% and 20% is significantly more apparent in patients with glaucoma when compared with visually healthy people with a similar age and similar cognitive/reading ability.
机译：目的：过去的研究尚未完全确定青光眼患者阅读困难的程度。这项研究测量了字母对比度降低时阅读速度的变化，以检验一种假设，即青光眼患者比年龄相近的视觉健康人群对字母对比度更敏感。方法：53例青光眼[平均年龄：66岁（标准差：9）]伴有双侧视野（VF）缺陷和40名年龄相似的视觉健康对照者[平均年龄：69（标准差：8）年]的阅读速度是在装有眼动仪的计算机设置上使用固定大小的非滚动文本进行测量的。所有参与者的视力≥6/ 9，并接受了包括汉弗莱24-2和10-2 VF在内的视觉功能标准测试。还测试了潜在的非视觉混杂因素，包括认知能力（Middlesex精神状态老年人评估测试）和一般阅读能力。分别从8个试验（文本的不同段落）以100％和20％的字母对比度计算出个人平均原始阅读速度。结果：患者的好眼平均24-2 VF MD为-6.5 dB（范围：0.7至-17.3）。由于患者文本对比度的降低，阅读速度的总体中位数降低为20％，但个体间差异却很大（四分位间距为8％-44％）。与对照组相比，该降低幅度明显更大（p = 0.01）[中位数：11％（四分位间距，6％-17％）]。患者和对照者在Middlesex老年人心理状态评估（p = 0.71），改良的Burt阅读能力测验（p = 0.33）和基于计算机的词汇决策任务（p = 0.53）上的平均表现相似，并且自我相似-报告的日常阅读频率（p = 0.12）。结论：与具有相似年龄和类似认知/阅读能力的视觉健康人群相比，青光眼患者的字母对比差异在100％和20％之间引起的平均阅读速度下降明显。

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