H55-H59: Other disorders of eye and adnexa

H55: Nystagmus and other irregular eye movements

These movements may only occur on one side or with both eyes. There may be various reasons why the eyes move involuntarily. These eye movements may be from birth or caused by another condition, for example.

The movements can be jerky and go in different directions. The eyes can involuntarily move to the side or upwards or downwards, for example.