Definition: Nystagmus is an involuntary movement of the eyes, sometimes leading to visual impairments. It can be acquired, but is more frequently present at birth. The eyes may move up and down, side to side, or around. It is caused by a weakness in the part of the brain that controls eye movement. For more information, visit the site of the American Nystagmus Network.
Also Known As: congenital nystagmus, CN, latent/manifest latent nystagmus, LMLN, dancing eyes
