title: The precorneal tear film: breakup time and location in normal subjects.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003315:Cornea / Q000502:physiology; D005452:Fluoresceins; D006801:Humans; D008297:Male; D008875:Middle Aged; D013666:Tears / Q000502:physiology; D013997:Time Factors
chemical_list: D005452:Fluoresceins