Plastic lenses are lighter than traditional glass lenses but they scratch more easily. Scratch resistant lenses can irritating for the wearer and look ugly. Scratch resistant coating are available to protect against damage and prolong lens life.
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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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