Nystagmus is a complex eye condition, characterised by involuntary eye movements, from side to side, up and down or round and round. This affects the ability to focus, see the world in three dimensions and recognise faces.
There are some treatments which can help with nystagmus. There are surgical options and drug therapies, though these are not suitable or effective in every case. Eye drops, prisms in glasses and other aids can also help.