The endothelial (posterior) corneal dystrophies (see Table 1[3-9]), which result from primary endothelial dysfunction, include Fuchs endothelial dystrophy (FECD1 – MIM136800; FECD2 – MIM610158), posterior polymorphous dystrophy (PPCD1 – MIM122000; PPCD2 – MIM609140; PPCD3 – MIM609141) and congenital hereditary endothelial dystrophy (CHED: CHED1 – MIM121700 and CHED2 – MIM217700). Here, OVOL2 is linked to endothelial dysfunction.