Microphthalmia, Isolated 4, also known as isolated microphthalmia 4, is related to microphthalmia, isolated 2 and microphthalmia, syndromic 9. An important gene associated with Microphthalmia, Isolated 4 is GDF6 (Growth Differentiation Factor 6). Affiliated tissues include eye and retina, and related phenotypes are microphthalmia and coloboma