How to evaluate tear film with evaluation with the help of slit
lamp?
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In testing for TBUT, sodium fluorescein dye is added to the eye and the tear film is observed under the slit lamp while the patient avoids blinking until tiny dry spots develop. Generally, >10 seconds is thought to be normal,(10, 11, 12) 5 to 10 seconds, marginal, and < 5 seconds is considered low.
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