Focusing of Light in the Eye
Photoreceptors and Visual Pathways
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Updated: Jun 6, 2026

Subjective Refraction Test Using a Smartphone for Vision Screening
Published on: October 18, 2024
Josephine O Ibironke1, David S Friedman, Michael X Repka
1Dana Center for Prevention Ophthalmology, Wilmer Eye Institute, Johns Hopkins School of Medicine, Baltimore, Maryland, USA.
Parental concerns about child development may indicate significant refractive errors like astigmatism and anisometropia in young children. Early eye exams are recommended for children with developmental concerns to rule out vision problems.
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