PURPOSEududDyslexia is the most common developmental reading disorder that affects language skills. Latent strabismus (heterophoria) has been suspected to be causally involved. Even though phoria correction in dyslexic children is commonly applied, the evidence in support of a benefit is poor. In order to provide experimental evidence on this issue, we simulated phoria in healthy readers by modifying the vergence tone required to maintain binocular alignment.ududMETHODSududVergence tone was altered with prisms that were placed in front of one eye in 16 healthy subjects to induce exophoria, esophoria, or vertical phoria. Subjects were to read one paragraph for each condition, from which reading speed was determined. Text comprehension was tested with a forced multiple choice test. Eye movements were recorded during reading and subsequently analyzed for saccadic amplitudes, saccades per 10 letters, percentage of regressive (backward) saccades, average fixation duration, first fixation duration on a word, and gaze duration.ududRESULTSududAcute change of horizontal and vertical vergence tone does neither significantly affect reading performance nor reading associated eye movements.ududCONCLUSIONududPrisms in healthy subjects fail to induce a significant change of reading performance. This finding is not compatible with a role of phoria in dyslexia. Our results contrast the proposal for correcting small angle heterophorias in dyslexic children.
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机译：目的 ud ud阅读障碍是影响语言技能的最常见的发育性阅读障碍。怀疑有潜在的斜视（异位症）。即使在阅读障碍儿童中普遍使用了矫正隐喻，支持这种益处的证据仍然很少。为了提供有关此问题的实验证据，我们通过修改保持双眼对齐所需的聚散度来模拟健康读者中的验光。 ud udMETHODS ud ud用16枚置于一只眼前的棱镜更改了聚散度健康受试者会诱发出色，食道或垂直性隐斜。对于每种情况，受试者应阅读一段，由此确定阅读速度。文本理解已通过强制选择题测试进行了测试。在阅读过程中记录眼动，然后分析其跳动幅度，每10个字母的扫视次数，倒退（向后）扫视的百分比，平均注视持续时间，单词的第一次注视持续时间和注视持续时间。 ud udRESULTS ud ud水平和垂直发散音调既不会显着影响阅读性能也不影响阅读相关的眼球运动。 ud ud结论 ud ud健康受试者中的棱镜无法引起阅读性能的显着变化。这一发现与诵读困难在阅读障碍中的作用不兼容。我们的结果与纠正阅读障碍儿童小角度异形症的建议形成对比。
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