Objective
To evaluate the risk of and risk factors for retinal neovascularization (NV) in cases of uveitis.
Design
Retrospective cohort study.
Participants
Patients with uveitis at four US academic ocular inflammation subspecialty practices.
Methods
Data were ascertained by standardized chart review. Prevalence data analysis used logistic regression. Incidence data analysis used survival analysis with time-updated covariates where appropriate.
Main Outcome Measures
Prevalence and incidence of NV.
Results
Among uveitic eyes of 8931 patients presenting for initial evaluation, 106/13,810 eyes had NV (prevalence=0.77%, 95% confidence interval (CI): 0.60%–0.90%). Eighty-eight more eyes developed NV over 26,465 eye-years (incidence=0.33%/eye-year, 95% CI: 0.27–0.41%). Factors associated with incident NV include age <35 as compared to >35 years (adjusted hazard ratio (aHR) = 2.4, 95% CI: 1.5–3.9), current cigarette smoking (aHR=1.9, 95% CI: 1.1–3.4), and systemic lupus erythematosus (aHR=3.5, 95% CI: 1.1–11). Recent diagnosis of uveitis was associated with an increased incidence of NV (compared to patients diagnosed >5 years ago, aHR=2.4 (95% CI 1.1–5.0) and aHR=2.6 (95%CI 1.2–6.0) for diagnosis within <1 year vs. 1–5 years respectively). Compared to anterior uveitis, intermediate uveitis (aHR=3.1, 95% CI: 1.5–6.6), posterior uveitis (aHR=5.2, 95% CI: 2.5–11), and panuveitis (aHR=4.3, 95% CI: 2.0–9.3) were associated with a similar degree of increased NV incidence. Active (aHR=2.1, 95%CI: 1.2–3.7) and slightly active (aHR=2.4, 95%CI: 1.3–4.4) inflammation were associated with an increased incidence of NV as compared to inactive inflammation. NV incidence also was increased with retinal vascular occlusions (aHR=10, 95% CI: 3.0–33), retinal vascular sheathing (aHR=2.6, 95% CI: 1.4–4.9), and exudative retinal detachment (aHR=4.1, 95% CI: 1.3–13). Diabetes mellitus was associated with a somewhat increased incidence of retinal NV (aHR=2.3, 95% CI: 1.1–4.9); and systemic hypertension (aHR 1.5; 95% CI:0.89–2.4) was associated with non-significantly increased NV incidence. Results were similar in sensitivity analyses excluding the small minority of patients with diabetes mellitus.
Conclusions
Retinal neovascularization is a rare complication of uveitis, which occurs more frequently in younger patients; smokers; and those with intermediate/posterior/panuveitis, systemic vasculopathy and/or retinal vascular disease; and active inflammation. Inflammation and retinal neovascularization likely are linked; additional studies are needed to further elucidate this connection.