Any isolated microphthalmia in which the cause of the disease is a mutation in the GDF3 gene. The disease is MONDO_0013377 (isolated microphthalmia 7). Also known as: GDF3 isolated microphthalmia, MCOP7, isolated microphthalmia caused by mutation in GDF3, isolated microphthalmia type 7, microphthalmia, isolated type 7.