"This study aimed to evaluate the equivalence of a smartphone-based visual acuity chart with a standard 6-m Snellen visual acuity (6SVA) chart." Researchers first reviewed Snellen chart apps that were ...
Verywell Health on MSN
What does it mean to be legally blind?
Medically reviewed by Christine L. Larsen, MD Key Takeaways Being legally blind means having central visual acuity of 20/200 ...
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