Radner W, Willinger U, Obermayer W, Mudrich C, Velikay-Parel M, Eisenwort B
Universitätsklinik für Augenheilkunde und Optometrie, Wien, Austria.
Klin Monbl Augenheilkd. 1998 Sep;213(3):174-81. doi: 10.1055/s-2008-1034969.
Reading acuity as well as reading speed are good predictors of everyday visual function. As visual acuity tests are poor predictors of the real-world function, performance-based tests, e.g., reading speed measurements, can be used for the determination of visual function. Thus, a German reading chart was developed in order to evaluate reading acuity as well as reading speed.
Print size is defined as the height of a lower case x and progresses logarithmically from one phrase to another (factor: 1.25). Reading acuity is determined in LogRAD (Reading Acuity Determination). 32 short German phrases were created, comparable concerning grammatical difficulty as well as in number (n = 14), length and position of words. The reading speed parameters measured with a stop-watch in 160 persons (aged: Phi = 21a +/- 3.8a) were calculated in words per minute (w/min). Out of the 32 phrases the 24 most similar ones were selected statistically and used for the reading charts (Radner Reading Charts). With these reading charts a reading acuity score (LogRAD-score) can be calculated considering reading errors in words of different length. Reading speed can be determined at the same time. Reading acuity (LogRAD-Score) was measured in 32 normal eyes of 16 students and compared to the angular visual acuity (LogMAR).
The mean reading speed of the test persons was 211.8 +/- 34.1 w/min. 24 phrases fulfilled the test item criteria for the reading chart: mean +/- 0.25 x SD. The reliability analyses yielded an overall Cronbach's alpha coefficient of 0.98! The mean visual acuity measured in 32 eyes was -0.115 +/- 0.097 LogMAR and the mean reading acuity score was +0.026 +/- 0.091 LogRAD. The mean difference was +0.104 +/- 0.066 and the correlation between LogMAR and LogRAD was good (r = 0.59).
With these reading charts it is for the first time possible to simultaneously determine reading acuity as well as reading speed in German. The high reliability of the 24 phrases and the high correlation between LogMAR and LogRAD leads us to expect a good reproducibility of the reading acuity evaluations. For the "Radner Reading Charts" we have shown that print size is the main reason for changes of reading speed.
阅读敏锐度和阅读速度是日常视觉功能的良好预测指标。由于视力测试对现实世界功能的预测能力较差，基于表现的测试，如阅读速度测量，可用于确定视觉功能。因此，开发了一种德语阅读图表，以评估阅读敏锐度和阅读速度。
字体大小定义为小写字母x的高度，并从一个短语到另一个短语按对数方式递增（系数：1.25）。在LogRAD（阅读敏锐度测定）中确定阅读敏锐度。创建了32个简短的德语短语，在语法难度、数量（n = 14）、单词长度和位置方面具有可比性。用秒表测量160人（年龄：Phi = 21岁±3.8岁）的阅读速度参数，以每分钟单词数（w/min）计算。从32个短语中通过统计学方法选出24个最相似的短语并用于阅读图表（拉德纳阅读图表）。使用这些阅读图表，可以考虑不同长度单词中的阅读错误来计算阅读敏锐度得分（LogRAD得分）。同时可以确定阅读速度。在16名学生的32只正常眼睛中测量阅读敏锐度（LogRAD得分），并与角视力（LogMAR）进行比较。
测试者的平均阅读速度为211.8±34.1 w/min。24个短语符合阅读图表的测试项目标准：平均值±0.25×标准差。可靠性分析得出总体克朗巴哈α系数为0.98！在32只眼睛中测量的平均视力为-0.115±0.097 LogMAR，平均阅读敏锐度得分为+0.026±0.091 LogRAD。平均差异为+0.104±0.066，LogMAR与LogRAD之间的相关性良好（r = 0.59）。
使用这些阅读图表首次能够同时测定德语的阅读敏锐度和阅读速度。24个短语的高可靠性以及LogMAR与LogRAD之间的高相关性使我们预期阅读敏锐度评估具有良好的可重复性。对于“拉德纳阅读图表”，我们已经表明字体大小是阅读速度变化的主要原因。
