Table 4.

Descriptive scale used for evaluation of tear-stain scores.

Scorea	Score descriptiona
0	No signs of any staining
1	Staining is barely detectable and area stained does not extend below the eyelid
2	Staining is obvious and area stained is ~ <50% of total eye area
3	Staining is obvious and area stained is ~50–100% of total eye area
4	Staining is severe, area stained is ~≥100% of total eye area, and area stained does not extend below the mouth line
5	Staining is severe, area stained is >100% of total eye area, and area stained extends below the mouth line

^aThis scoring system was developed previously (15).