Polycarbonate is the same material used for bulletproof glasses. It is the most impact of lens material. Polycarbonate is the material of choice for safety glasses and for children. With an index of 1.59, polycarbonate also produces thinner, lighter lenses than glass or plastic. Polycarbonate has ability to give uv protection.
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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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