Glass is most stable, scratch resistant material which provide the best optical quality of all lens materials. Glass is easy to break than other lens materials and hence the lenses made of glass must be tempered or heat treated to give them more strength and make them safer to wear. Glass is available in a number of indices of refraction.
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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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ReplyDeleteOn account of delicate toric single vision focal points for astigmatism, the focal point must be held back from pivoting in the eye, as there are various forces for various meridians. Zombie contact lenses
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