Granular corneal dystrophy has two types: Granular corneal dystrophy is diagnosed during an eye examination by an ophthalmologist or optometrist.

[citation needed] Granular corneal dystrophy is caused by a mutation in the TGFBI gene, located on chromosome 5q31.

The gene TGFBI encodes the protein keratoepithelin.

[5] Corneal transplant is not needed except in very severe and late cases.

Light sensitivity may be overcome by wearing tinted glasses.