Keyhole bridge looks like the keyhole in the door. The bridge out line isn't continuous, it has small cut out section on either side. This means the nose doesn't make continuous contact with the front of the frame in the area called nasal crest.
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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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