We report the first case of a unilateral microcystic Meesmann's epithe
lial dystrophy, observed in the left cornea of a 43-year-old patient.
The diagnosis was verified histologically by the unilateral occurrence
of a 'peculiar substance' within epithelial cysts and within the cyto
plasm of the corneal epithelial cells. In an attempt to resolve the pa
tient's frequent corneal erosions, we performed an autologous stem cel
l transplantation from the non-involved right eye. The results are, so
far, satisfactory.