Familial Exudative Vitreoretinopathies
A group of inherited disorders characterized by incomplete development of the retinal vasculature. Its severity can vary from complete blindness in infancy, to mild or no visual problems, where small areas of vascular defects are observable only by FLUORESCEIN ANGIOGRAPHY. Exudative vitreoretinopathy 1 is associated with mutations in the FZD4 gene.