The Snellen chart is a common test of visual acuity that requires that person to read rows of letters of diminishing size until he or she can no longer distinguish them.

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Quizplus · Accepted Answer

The Snellen chart is indeed used to measure visual acuity by having individuals read rows of letters that decrease in size, to determine the smallest size they can clearly distinguish.

The Snellen Chart Is a Common Test of Visual Acuity