Sodium‐glucose co‐transporter‐2 inhibition and ocular outcomes in patients with type 2 diabetes: A systematic review and meta‐analysis

Sodium-glucose co-transporter-2 (SGLT2) inhibitors are effective for the treatment of macrovascular complications and nephropathy in type 2 diabetes, but effects on microvascular eye outcomes are unclear. We conducted a systematic review and meta-analysis of randomized placebo-controlled trials to evaluate the effect of SGLT2 inhibition on total ocular events and retinopathy in patients with type 2 diabetes. We searched MEDLINE and Embase for the period from database inception date to October 11, 2019. Two reviewers working independently extracted relevant data. Random-effects models with inverse variance weighting were selected to estimate summary risk ratios (RRs) and 95% confidence intervals (CIs). We included nine studies, involving 39 982 patients with a mean follow-up of 2.8 years. There were 1414 total ocular events, of which 624 were retinopathy events. SGLT2 inhibition was not associated with a change in the risk of total ocular events (RR 0.97, 95% CI 0.85, 1.11) or retinopathy (RR 0.98, 95% CI 0.84, 1.16), with consistent effects across studies (P for heterogeneity = 0.35 and 0.45, respectively). The effects of SGLT2 inhibition on eye disease in individuals with type 2 diabetes are probably null, although the available data cannot exclude small to moderate benefits or harms.