Most plastic frames are made of Zylonite, cellulose propionate or polyamide. The Metal frames are usually made from nickel silver and Monel. Titanium frames have high tensile strength and ultra lightweight and impressive corrosion resistance . But it is expensive.
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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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