Ophthalmology Diseases of orbit, Lids and lacrimal apparatus 9141d364

Phenol red thread test is used for dry eye. This test-

Requires topical anaesthetic agent

Volume of tears isn't measured as it changes color on contact with tears

If the color changes to blue, it depicts surface mucin deficiency

Requiras pH meter for reading result

High-Yield Explanation

*Phenol red dye test measures the production of tears without topical anesthesia, as the dye changes its color to red on contact with tears. It doesn't require pH meter for reading the result. Ref: Ophthalmology Yanoff and Duker 4th/e p.277

Phenol red thread test is used for dry eye. This test-

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