Subramanian Ahalya, Pardhan Shahina
Department of Optometry and Visual Science, City University, London, UK.
Optom Vis Sci. 2006 Aug;83(8):572-6. doi: 10.1097/01.opx.0000232225.00311.53.
The purposes of this study are to establish the repeatability of the MNREAD acuity charts in a normal adult population and to determine the coefficient of repeatability for reading acuity, reading speed, and critical print size. The study also investigates how changing the working distance affects these parameters.
Thirty normal young adults (mean age, 23.3 years) participated. Test-retest repeatability was assessed at 40 cm over two sessions by the same examiner using MNREAD charts 1 and 2. Additional measurements were also carried out at 24 cm and 52 cm working distances. The distance and the version of the chart used were randomized.
The coefficient of repeatability was found to be +/- 0.05 logarithm of the minimum angle of resolution (logMAR) for reading acuity, +/- 0.12 logMAR for critical print size, and +/- 8.6 words per minute for reading speed. Reading acuity and critical print size changed significantly with testing distance (p = 0.001). No changes were found in the reading speed at the different test distances (p = 0.27).
The MNREAD acuity charts can be used reliably to measure reading acuity, reading speed, and critical print size in a normal adult population.
本研究的目的是确定MNREAD视力表在正常成年人群中的可重复性，并确定视力、阅读速度和临界印刷字体大小的可重复性系数。本研究还调查了改变工作距离如何影响这些参数。
30名正常年轻成年人（平均年龄23.3岁）参与研究。由同一名检查者在两个测试环节中于40厘米处使用MNREAD视力表1和2评估重测可重复性。还在24厘米和52厘米的工作距离处进行了额外测量。使用的视力表的距离和版本是随机的。
发现视力的可重复性系数为±0.05最小分辨角对数（logMAR），临界印刷字体大小的可重复性系数为±0.12 logMAR，阅读速度的可重复性系数为±每分钟8.6个单词。视力和临界印刷字体大小随测试距离的变化显著（p = 0.001）。在不同测试距离下阅读速度未发现变化（p = 0.27）。
MNREAD视力表可可靠地用于测量正常成年人群的视力、阅读速度和临界印刷字体大小。
