Fluorescein shading is associated with the tear film and the patient is asked for that not squint rapidly, and a short time later the time taken for dry spots to occur on the corneal surface is noted. This between time of the time is known as the TBUT., and the break is lessened in patients with dry eyes.
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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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