_:n474629b903bc41d3808507360fbdb95cxb2
<http://schema.org/text>
"A dry eye evaluation by your eye doctor begins with questions about your family health history, general health and any previous eye problems. The eye doctor may evaluate tear production using the Schirmer Test, which involves placing small pieces of blotting paper under your lower eyelids for five minutes and measuring the amount of tears. The phenol red thread test is similar to the Schirmer Test, but uses a thread soaked with PH-sensitive dye rather than blotting paper."
<https://www.southerneyecare2020.com/2022/02/28/is-your-covid-mask-causing-dry-eyes/>