The visual correlates of dyslexia are the subject of controversy, and much evidence suggests that they may include some aspects of binocular and accommodative function. These factors were investigated in 43 control and 39 dyslexic children, who were matched for age, sex and performance intelligence quotient. The dyslexic group exhibited significantly lower positive and negative vergence reserves, and vergence instability when the eyes were dissociated at near. Their amplitudes of accommodation also were significantly reduced. However, other measures including dissociated and associated heterophoria and accommodative lag and facility were similar in both groups. The stability of motor ocular dominance, as assessed with a modified Dunlop test, was similar in both groups. The results of a simulated reading visual search task suggested that the vergence and accommodative dysfunction were not a major cause of the dyslexia. Further analyses, using reading-age matched groups, suggested that these ocular motor correlates were not attributable to the better reading performance in the control group. The most likely remaining explanation is that they are, in most cases, non-causal correlates of the dyslexia.

译文

:阅读障碍的视觉相关性是一个有争议的主题,许多证据表明它们可能包括双眼和调节功能的某些方面。在43名对照和39名阅读障碍儿童中对这些因素进行了调查,这些儿童的年龄,性别和表现智力商均匹配。诵读困难的人群表现出明显较低的正和负散度储备,并且当眼睛在附近分离时散度不稳定。他们的住宿幅度也大大降低。但是,两组的其他指标,包括解离和相关的异方波,适应性滞后和适应性,均相似。改良的Dunlop检验评估的运动眼优势的稳定性在两组中相似。模拟阅读视觉搜索任务的结果表明,阅读障碍和适应性功能障碍不是阅读障碍的主要原因。使用阅读年龄匹配组的进一步分析表明,这些眼动相关性并不归因于对照组中更好的阅读性能。剩下的最可能的解释是,在大多数情况下,它们是阅读障碍的非因果关系。

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