For veterans without HIV compared to those with HIV with CD4+ ≥ 500, the SCD adjusted risk was 1.03 (95% CI: 0.90–1.18) and with a CD4+ risk measure not reaching a significant level until CD4+ was < 200 for a risk of 1.57 (95% CI: 1.28–1.92). Here, CD4 is linked to Schnyder corneal dystrophy.