Related Experiment Video
Updated: May 11, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
Published on: April 11, 2025
Preventable visual impairment in children with nonprofound intellectual disability
Lokman Aslan1, Murat Aslankurt, Adnan Aksoy
1Ophthalmolgy Department, Faculty of Medicine, Sutcu Imam University, Kahramanmaras¸ - Turkey. lokaslan46@yahoo.com
Children with intellectual disability (ID) have a high rate of preventable vision problems like refractive errors and strabismus. Early eye screenings are crucial for managing these conditions and improving their quality of life.
Area of Science:
- Ophthalmology
- Pediatrics
- Genetics
Background:
- Intellectual disability (ID) affects a significant pediatric population.
- Visual impairments can negatively impact development and quality of life in children with ID.
- Early detection and management of ocular conditions are essential for this vulnerable group.
Purpose of the Study:
- To evaluate the prevalence of preventable visual impairments in children with nonprofound intellectual disability.
- To compare ocular findings between children with Down syndrome (DS) and other forms of nonprofound ID.
- To identify specific ophthalmic conditions requiring intervention in pediatric ID.
Main Methods:
- Ophthalmologic examinations were conducted on 215 children with ID (90 with DS, 125 with other ID) and 116 healthy controls.
- Comprehensive eye assessments included cycloplegic refraction, ocular motility evaluation, strabismus screening, slit-lamp biomicroscopy, funduscopy, and intraocular pressure measurement.
- Statistical analysis was performed to compare findings across groups.
Main Results:
- Refractive errors were the most common finding (61.1% in DS, 45.6% in other ID) compared to controls (11.2%).
- Strabismus was significantly more prevalent in children with DS (33.2%) and other ID (15.2%) than in controls (3.5%).
- Cataracts and nystagmus were observed in children with ID but not in the control group.
Conclusions:
- Children with intellectual disability exhibit a high prevalence of visually impairing conditions, including refractive errors, strabismus, and cataracts.
- Down syndrome is associated with a higher frequency of strabismus and specific refractive errors like hyperopia.
- Routine ophthalmic screenings are vital for early detection and management to enhance the quality of life for children with ID.
Related Concept Videos
Photoreceptors and Visual Pathways
Intellectual Disability
Diabetic Retinopathy
Focusing of Light in the Eye
Glaucoma: Overview
Visual Agnosia

