Study on Prevention and Treatment of Dry Eye in Patients Using Glaucoma Drops

Inclusion criteria

• ✓. Subjective symptoms (required): dryness, foreign body sensation, fatigue and discomfort;
• ✓. The instability of tear film (required): tear break up time (TBUT);
• ✓. Lacrimal secretion: Schirmer I test;
• ✓. The ocular surface damage (strengthen diagnosis): fluorescein staining (FL); in the mentioned in ①+②（TBUT≤5s) or ①+②（TBUT≤10s)+③（\<10mm）/④（FL+）。