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What is the rule for the Snellen chart?
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Open Sep 19, 2025 - 03:04 AM
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Sep 19, 2025 - 03:04 AM
The rule for the Snellen chart is that it measures visual acuity by having the patient read letters of decreasing size from a specific distance, usually 20 feet (6 meters). The smallest line of letters that the patient can read accurately determines their visual acuity, recorded as a fraction such as 20/20.
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