Frontonasal Dysplasia 3, also known as frontonasal dysplasia - severe microphthalmia - severe facial clefting syndrome, is related to frontonasal dysplasia 1 and microphthalmia. An important gene associated with Frontonasal Dysplasia 3 is ALX1 (ALX Homeobox 1). Affiliated tissues include bone and skin, and related phenotypes are agenesis of corpus callosum and ptosis