Peripheral corneal opacification in the line of closure of the embryonic fissure associated with hyperopic astigmatism and anisometropic amblyopia was identified in two eyes of two members of a family with isolated autosomal dominant coloboma-microphthalmos. A review of the literature disclosed no previously reported cases. It would appear that the gene for isolated coloboma-microphthalmos can affect the growth and differentiation of mesenchymal cells of neural crest origin, as well as the neuroectodermal tissues of the embryonic fissure.