These lenses react to light so that indoors or in dull condition they they have a light tint, and in bright light they darken to eliminate glare and protect the eyes from uv rays. They have two colors photo grey and photo brown.
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Advantages: The chart is familiar Inexpensive, quick and easy to use and interpret Disadvantages: Snellen chart has only one 6/60 lette...
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Preferences: Similarly quantities of letters per line. Consistently separating amongst lines and letters. Uniform movement ...
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Don't take your eyes for granted. Take these easy steps to keep your peepers healthy.
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