Tehran University of Medical Sciences

Science Communicator Platform

Stay connected! Follow us on X network (Twitter):
Share this content! On (X network) By
Visual Function Deficits in Dyslexic Children: A Case-Control Study Publisher Pubmed



Darvishi A1 ; Sangsefidi N2, 3 ; Shandiz JH4, 5 ; Rad DS6 ; Narooienoori F7 ; Khorraminejad M7, 8
Authors
Show Affiliations
Authors Affiliations
  1. 1. Contact Lens and Visual Optics Laboratory, Centre for Vision and Eye Research, Optometry and Vision Science, Queensland University of Technology, Brisbane, 4059, Australia
  2. 2. Department of Biostatistics, School of Health, Mashhad University of Medical Sciences, Mashhad, Iran
  3. 3. Student Research Committee, Mashhad University of Medical Sciences, Mashhad, Iran
  4. 4. Refractive Errors Research Center, school of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
  5. 5. Department of Optometry, school of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
  6. 6. Department of Speech Therapy, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
  7. 7. School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran
  8. 8. Optical Techniques Department, College of Health and Medical Techniques, Al-Mustaqbal University, Babylon, 51001, Iraq

Source: BMC Ophthalmology Published:2025


Abstract

Purpose: To compare the ophthalmic findings between dyslexic and non-dyslexic children aged 7–10 years. Methods: 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). Results: 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). Conclusion: 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. © The Author(s) 2025.
Related Docs
1. Accommodation, Convergence, and Stereopsis in Dyslexic Schoolchildren, Middle East African Journal of Ophthalmology (2018)
2. Psychophysical Evidence for Impaired Magno, Parvo, and Konio-Cellular Pathways in Dyslexic Children, Journal of Ophthalmic and Vision Research (2015)
3. The Effect of Online Visual Games on Visual Perception, Oculomotor, and Balance Skills of Children With Developmental Dyslexia During the Covid-19 Pandemic, International Ophthalmology (2023)
Experts (# of related papers)
View all Related Experts
Hamid Dalvand (1)
Majid Akrami (1)