Raymond J E, Ogden N A, Fagan J E, Kaplan B J
Faculty of Social Sciences, University of Calgary, Alberta, Canada.
Am J Optom Physiol Opt. 1988 Mar;65(3):174-81. doi: 10.1097/00006324-198803000-00006.
Fixational stability and saccadic eye movements were measured in 9- to 13-year-old dyslexics with signs of subtle cerebellar dysfunction and in a group of age-matched normal readers. This group of dyslexics was specifically chosen because cerebellar disorders are often associated with ocular motor dysfunction. Dyslexic children were found to exhibit significantly greater fixational instability than controls while viewing a simple, stationary stimulus. Although both groups of children showed disruption of fixational stability when viewing stationary targets against optokinetic backgrounds, gaze stability of dyslexics was more degraded than that of controls. However, latency and accuracy of saccadic eye movements of dyslexic children were not different from those of normal readers. The results suggest that poor maintenance of gaze stability, rather than inadequate control over saccadic eye movements, characterizes the ocular motor problems that may contribute to reading difficulties in this subgroup of dyslexics.
对9至13岁有轻微小脑功能障碍迹象的阅读障碍者以及一组年龄匹配的正常阅读者进行了注视稳定性和眼跳运动测量。之所以特别挑选这组阅读障碍者，是因为小脑疾病常与眼动功能障碍相关。结果发现，阅读障碍儿童在观看简单静止刺激物时，注视稳定性明显比对照组差。尽管两组儿童在观看静止目标与视动背景时注视稳定性均受到干扰，但阅读障碍者的注视稳定性比对照组下降得更厉害。然而，阅读障碍儿童的眼跳运动潜伏期和准确性与正常阅读者并无差异。结果表明，注视稳定性维持不佳而非眼跳运动控制不足，是导致这一亚组阅读障碍者阅读困难的眼动问题特征。
