Bifocal lenses contains two optical corrections with a distinct dividing line between the two parts. The most common use of bifocals is for presbyopia.
The upper part of the lens corrects distance vision the lower half is for near vision.
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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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