The Snellen Eye Chart & 20/20 Vision - Looking Glass Optical
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By A Mystery Man Writer
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4.8(483)
Product Description
You may have seen the familiar chart in your doctor's office. Here’s a look at the history of the Snellen Eye Chart and how it's used to test your eyesight.
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A double-sided Standard Snellen Chart for testing at 20 ft and 10 ft based on a visual angle of one minute. The front side has a 20 ft Snellen Chart