Microphthalmia, Syndromic 13, also known as x-linked colobomatous microphthalmia-microcephaly-intellectual disability-short stature syndrome, is related to microphthalmia, syndromic 1 and microphthalmia. An important gene associated with Microphthalmia, Syndromic 13 is HMGB3 (High Mobility Group Box 3). Affiliated tissues include eye and retina, and related phenotypes are intellectual disability and ptosis