When You Understand The Math Behind Eye Charts, You Can Test Someone's Vision From Two Miles Away

When You Understand The Math Behind Eye Charts, You Can Test Someone's Vision From Two Miles Away
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Calculating a person's visual acuity requires some extremely precise measurements — but once you have the math down, you can have some fun with vision tests.
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Fecha: May 8, 2018 at 02:54PM
via Digg Histories: http://digg.com/video/eye-chart-math-history?utm_source=ifttt

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