Population-based retrospective cohort study on risk of age-related macular degeneration in people with chronic obstructive pulmonary disease

Chronic obstructive pulmonary disease (COPD) and age-related macular degeneration (AMD) are both common diseases of the elderly people. COPD induced systemic inflammation and hypoxia may have an impact on the development of AMD. This study investigated the possible association between COPD and subsequent risk of AMD. A retrospective cohort study was conducted based on the data from the National Health Insurance Research Database in Taiwan. The COPD cohort comprised 24,625 adult patients newly diagnosed during 2000–2012, whereas age-, gender-, and the year of diagnosis-matched non-COPD cohort comprised 49,250 individuals. Incident AMD was monitored to the end of 2013. A Cox proportional hazards model was applied to evaluate the risk of AMD. The COPD cohort showed 1.25 times higher AMD incidence than the non-COPD cohort (4.80 versus 3.83 per 1000 person-years, adjusted hazard ratio (HR) = 1.20 [95% confident interval (CI) = 1.10–1.32]). Stratified analyses for age, gender, and presence of comorbidity resulted in significant adjusted HRs in most subgroups. Further analysis revealed that the COPD group had an increased risk of both the exudative and non-exudative types of AMD (adjusted HRs = 1.49 [95% CI = 1.13–1.96] and 1.15 [95% CI = 1.05–1.26], respectively). COPD patients have an increased risk for AMD development. Clinicians should provide adequate care for the ocular health to these patients.