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Subjective Refraction Test Using a Smartphone for Vision Screening
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Changes in refractive errors in albinism: a longitudinal study over the first decade of life
Anna Schweigert1, Scott Lunos2, John Connett3
1Department of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis.
Summary
Children with albinism experience increasing astigmatism in their first decade. Regular eye exams are crucial for monitoring vision changes and managing refractive errors in albinism.
Area of Science:
- Ophthalmology
- Genetics
- Pediatrics
Background:
- Albinism is a group of genetic disorders characterized by a lack of pigment.
- Ocular findings in albinism include hypopigmentation, foveal hypoplasia, nystagmus, strabismus, and refractive errors.
- Longitudinal data on refractive changes in pediatric albinism are essential for understanding disease progression and optimizing visual management.
Purpose of the Study:
- To analyze longitudinal changes in refraction, specifically astigmatism and spherical equivalent, in patients with albinism.
- To compare refractive outcomes among different subtypes of albinism (OCA1A, OCA1B, OCA2).
Main Methods:
- Retrospective review of medical records of 481 patients with albinism.
- Inclusion criteria: cycloplegic refractions at three age points (0-18 months, 4-6 years, 8-10 years).
- Analysis of 75 patients' right eyes, recording refraction, albinism type, glasses wear, and best-corrected visual acuity (BCVA).
Main Results:
- Mean astigmatism significantly increased from 1.60 D to 2.87 D between the first and third visits (P < 0.0001).
- Spherical equivalent showed no significant change over time (P = 0.0578).
- Patients with OCA1A had significantly worse BCVA (20/104) and higher astigmatism (+4.08 D) compared to OCA1B (20/59, +2.30 D) and OCA2 (20/66, +2.53 D).
Conclusions:
- Astigmatism progression is a significant finding in children with albinism within the first 10 years of life.
- Periodic cycloplegic refractions are necessary for timely detection and management of refractive errors in this population.
- Subtype-specific differences in visual acuity and astigmatism highlight the importance of genetic diagnosis in albinism management.
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