Ygge J, Lennerstrand G, Axelsson I, Rydberg A
Department of Ophthalmology, Karolinska Institutet, Huddinge University Hospital, Sweden.
Acta Ophthalmol (Copenh). 1993 Feb;71(1):1-9. doi: 10.1111/j.1755-3768.1993.tb04952.x.
Eighty-six 9-year old dyslexic children were carefully matched to controls with regard to age, sex, class in school, and intelligence and thorough visual functions tests and eye examinations were performed. As a group the dyslexic pupils exhibited a lower distance as well as near visual acuity both with monocular and binocular viewing. Furthermore, the dyslexic pupils had a lower contrast sensitivity at the lower and higher spatial frequencies. These differences were all statistically significant. However, no statistically significant differences between the two groups could be observed regarding refractive errors or contrast sensitivity in the middle spatial frequency range. Although some eyes were amblyopic, any severe eye anomalies or diseases were not found in any of the investigated children.
86名9岁的诵读困难儿童在年龄、性别、在校年级和智力方面与对照组进行了仔细匹配，并进行了全面的视觉功能测试和眼部检查。作为一个群体，诵读困难的学生在单眼和双眼观察时，远视力和近视力都较低。此外，诵读困难的学生在较低和较高空间频率下的对比敏感度也较低。这些差异均具有统计学意义。然而，在屈光不正或中间空间频率范围内的对比敏感度方面，两组之间未观察到统计学上的显著差异。虽然有些眼睛存在弱视，但在任何被调查的儿童中均未发现任何严重的眼部异常或疾病。
