Darvishi Azam, Sangsefidi Negar, Shandiz Javad Heravian, Rad Davood Sobhani, Narooie-Noori Foroozan, Khorrami-Nejad Masoud
Contact Lens and Visual Optics Laboratory, Centre for Vision and Eye Research, Optometry and Vision Science, Queensland University of Technology, Brisbane, 4059, Australia.
Department of Biostatistics, School of Health, Mashhad University of Medical Sciences, Mashhad, Iran.
BMC Ophthalmol. 2025 Mar 18;25(1):144. doi: 10.1186/s12886-025-03959-3.
To compare the ophthalmic findings between dyslexic and non-dyslexic children aged 7-10 years.
A matched case-control study was conducted on 32 dyslexic children as a case group and 32 non-dyslexics as a control group. Both groups underwent complete ophthalmic examinations to measure corrected distance visual acuity, refractive errors, latent and manifest deviations, stereoacuity, near point of accommodation (NPA), and contrast sensitivity (CS).
The mean age of the participants in our study was 8.1 ± 0.8 (range 7-10) years. Both dyslexic and non-dyslexic groups consisted of 17(53.1%) boys and 15(46.9%) girls. There was no significant difference in visual functions (P > 0.05) except for stereoacuity and contrast sensitivity between the two groups. Contrast sensitivity (CS) was decreased and aggravated in dyslexics versus controls. The mean score of binocular CS in the case and control group was 115.8 ± 40.6 and 175.6 ± 44.3 cycle per degree, respectively (P < 0.001). Notably, stereoacuity was increased in dyslexics versus controls (94.2 ± 73.6 vs. 60.94 ± 12.01 s/arc, P = 0.017).
Dyslexic children exhibited decreased contrast sensitivity and impaired stereoacuity compared to controls. These findings support the theory of magnocellular system deficits in dyslexia. Further research is required to elucidate the role of contrast sensitivity and its impact on dyslexic vision.
比较7至10岁诵读困难儿童与非诵读困难儿童的眼科检查结果。
进行了一项匹配病例对照研究，以32名诵读困难儿童作为病例组，32名非诵读困难儿童作为对照组。两组均接受了全面的眼科检查，以测量矫正远视力、屈光不正、潜在和显性斜视、立体视锐度、调节近点（NPA）和对比敏感度（CS）。
本研究参与者的平均年龄为8.1±0.8（范围7至10）岁。诵读困难组和非诵读困难组均由17名（53.1%）男孩和15名（46.9%）女孩组成。除两组之间的立体视锐度和对比敏感度外，视觉功能无显著差异（P>0.05）。与对照组相比，诵读困难者的对比敏感度（CS）降低且加重。病例组和对照组双眼CS的平均得分分别为每度115.8±40.6和175.6±44.3周期（P<0.001）。值得注意的是，与对照组相比，诵读困难者的立体视锐度增加（94.2±73.6对60.94±12.01秒/弧，P=0.017）。
与对照组相比，诵读困难儿童表现出对比敏感度降低和立体视锐度受损。这些发现支持了诵读困难中大细胞系统缺陷的理论。需要进一步研究以阐明对比敏感度的作用及其对诵读困难视力的影响。
