These lenses are curved more in one direction than other. All the cylindrical lenses have axis. The axis refers to the orientation of the cylindrical area of the lens.The axis can be anywhere from 0 to 180 degrees, with 90 being the vertical meridian.
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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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