Fujita Kyoko, Naruse Mutsuko, Oda Kouichi, Yuzawa Mitsuko
Department of Ophthalmology, Surugadai Hospital of Nihon University, Tokyo, Japan.
Nippon Ganka Gakkai Zasshi. 2005 Feb;109(2):83-7.
To evaluate reading performance in patients with age-related macular degeneration (AMD).
Six normal subjects over 50 years of age and 40 patients with AMD were evaluated. Near visual acuity, critical print size, and maximum reading speed were tested to compare the data from normal subjects with those from AMD patients. Scanning laser ophthalmoscope (SLO) microperimetry was performed to observe fixation in AMD patients.
The mean critical print size for normal subjects was 0.15 logarithm of the minimum angle of resolution (log MAR) and the mean maximum reading speed was 307 characters/min. There was a plateau area in reading function where reading speed did not rise and stayed constant even though print size increased. The mean critical print size for AMD patients was 0.97 log MAR, and the mean maximum reading speed was 140 characters/min. The critical print size and maximum reading speed differed significantly between normal and AMD subjects. Eleven of the 40 patients with AMD did not have the character size and reading speed relationship, which means they manifested a plateau as seen in normal subjects. Eight of the 11 patients did not show stable fixation with SLO microperimetry.
The reading performance of AMD patients was remarkably impaired, especially in those with poorer visual function and no fixation.
评估年龄相关性黄斑变性（AMD）患者的阅读能力。
对6名50岁以上的正常受试者和40名AMD患者进行评估。测试近视力、临界印刷字体大小和最大阅读速度，以比较正常受试者和AMD患者的数据。对AMD患者进行扫描激光检眼镜（SLO）微视野检查以观察注视情况。
正常受试者的平均临界印刷字体大小为0.15最小分辨角对数（log MAR），平均最大阅读速度为307个字符/分钟。阅读功能存在一个平稳区域，在此区域内，即使印刷字体大小增加，阅读速度也不会提高且保持恒定。AMD患者的平均临界印刷字体大小为0.97 log MAR，平均最大阅读速度为140个字符/分钟。正常受试者和AMD患者之间的临界印刷字体大小和最大阅读速度存在显著差异。40名AMD患者中有11名不存在字符大小与阅读速度的关系，这意味着他们表现出了与正常受试者相同的平稳状态。11名患者中有8名在SLO微视野检查中未表现出稳定的注视。
AMD患者的阅读能力显著受损，尤其是那些视力较差且无注视功能的患者。
