Effect of long-term topical antiglaucoma medication use on the ocular surface

Abstract

Purpose: The purpose of this study was to describe the prevalence and pattern of ocular surface disease (OSD) in glaucoma patients using preserved topical antiglaucoma medications in a Nigerian population. Methodology: A comparative study of patients who had used topical preserved antiglaucoma medications for 6 months or more with age‑ and sex‑matched individuals who were not on any other form of topical eye medication was carried out using fluorescein tear breakup time (FTBUT), Schirmer I test, and ocular surface staining with fluorescein and lissamine green. The right eyes of 103 eligible patients with primary open‑angle glaucoma and that of 103 age‑ and sex‑matched individuals (controls) were included in the study. Results: The prevalence of OSD among users of preserved topical antiglaucoma medications was significantly higher than among nonusers as assessed by FTBUT (83.5% vs. 57.3%; P < 0.001), Schirmer I (30.1% vs. 17.5%; P = 0.033), and ocular surface staining (62.1% vs. 31.1%; P < 0.001). Users of preserved topical antiglaucoma medications also had worse grades of OSD evaluated by FTBUT (P = 0.001), Schirmer I (P = 0.023), and ocular surface staining (P < 0.001). Conclusion: The prevalence of subjective OSD was significantly higher among users of topical antiglaucoma medications than nonusers. Hence, preserved topical medication use is a serious concern for increased ocular surface morbidity among glaucoma patients. This calls for more attention to be paid to the consequences of OSD among glaucoma patients on topical medications.