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COMPLICATIONS diabetes (DoD) and poor glycemic control (2). Genetic factors are also implicated, with heritability of 52% for proliferative DR (PDR) (3,4). Several candidate gene and genome-wide association studies (GWAS) have been conducted (5-11). Although several polymorphisms have been suggested to be associated with DR, few have been convincingly replicated (10,12-15). There are several reasons why studies have not yielded consistent findings. The genetic effects are likely modest, and identification requires large sample sizes. Previous studies have not consistently accounted for the strongest two covariates, DoD and glycemic control. Liability threshold (LT) modeling is one way to incorporate these covariates while also increasing statistical power (16). Finally,

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