Criteria to detect minimal expressivity within families with autosomal dominant aniridia.

Autosomal dominant aniridia with complete penetrance without Wilms' tumor in five generations with 27 affected family members has been reassigned from chromosome 2p25 to chromosome 11p13. Clinically, aniridia was obvious in affected individuals with variable expressivity when they had rudimentary iris stumps, typical or atypical iris colobomata, or round, eccentric pupils. However, iris and retinal fluorescein angiography was required to detect abnormal vascular remodeling that resulted in incomplete iris collarettes and decreased retinal foveal avascular zones in 27 family members at risk with round, central pupils. These angiograms distinguished five affected and 22 unaffected individuals, and were the critical criteria required to detect minimal expressivity of aniridia in family members with round, central pupils.