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Amsler grid

Amsler grid
When people with wet age-related macular degeneration (AMD) look at straight lines, the lines actually look bent or wavy. Doctors often test people's vision by asking them to look at a grid of straight lines like this one.
Reproduced from: Age-Related Macular Degeneration: What You Should Know. U.S. Department of Health and Human Services. Available at: http://www.nei.nih.gov/health/maculardegen/nei_wysk_amd.PDF.
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