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Snellen chart - Wikipedia
How the Snellen Eye Chart Is Used to Test Both of Your Eyes
All About the Snellen Eye Chart - All About Vision
Visual Acuity Testing (Snellen Chart) - MDCalc
Visual Acuity Test: Types, Procedure & Interpreting Results
Visual Acuity Score: Tests, Charts & Scores Explained - Vision Center
Snellen Chart - StatPearls - NCBI Bookshelf - National Center for ...
Visual Acuity - American Academy of Ophthalmology
Visual Acuity Test and the Snellen Eye Chart - Verywell Health