The essential things that requires for performing cover test are :
Good central fixation and patient should not miss the target as he have shown by observer.
Patient should be good cooperative.
No ocular motility restrictions.
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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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