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Why wasn’t the common eye chart to test the subjects’ vision?

April 26, 2017chart common eye Test vision

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Why wasn’t the common eye chart to test the subjects’ vision?

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The Snellen Chart, which is the eye chart with the large “E” that most patients are familiar and which was developed in the 1800’s, measures distance vision only. The PRIO tester, a much newer medical device, simulates a computer screen and measures the near power needed to work at the computer.