Nystagmus is characterised by involuntary movement of the eyes, symptomatic of problems with the visual pathway. It causes varying degrees of sight impairment. Nystagmus is often a genetic condition and may be associated with albinism, but can also be caused by a number of medical conditions such as cataracts, glaucoma or aniridia. report this ad Wobbly Wednesday is your opportunity to learn more about this limiting condition. Nystagmus affects 1 in 1,000 people. It is a form of visual impairment and can occur at any time of life. It is the most common form of visual impairment in school-aged children in the UK. People affected by nystagmus encounter visual problems throughout their lives and need support in education and employment.