Latent nystagmus is reported in one of two identical 5-year-old male twins. There were no other abnormal ocular findings and both children were orthophoric. The presence of latent nystagmus in only one of two identical twins implies that there is no genetic defect in this disorder. The twin with latent nystagmus had suffered a febrile convulsion at the age of 9 months and it is suggested that latent nystagmus may be caused by postnatal insults to the central nervous system.
Abramson DH. Latent Nystagmus in Identical Twins. Arch Ophthalmol. 1973;89(3):256-257. doi:10.1001/archopht.1973.01000040258017