The alternate cover test is useful to measure total deviation. It doesn't separate phoria from tropia. During alternate cover test, the cover is placed alternately infront of each eye rapidly in order to break the fusion.
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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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