Nystagmus is a condition which causes constant movement of the eyes which you can’t control.
This can be in a side to side, an up and down, or a circular motion, or a combination of these. This uncontrolled movement can affect how clearly you can see. Most people with nystagmus have reduced vision.
Nystagmus is caused by a problem with the way the eye sends messages back to the brain or how parts of the brain which deal with eye movement make sense of the information.
The RNIB have created an Understanding Nystagmus guide, which is accredited by the Royal College of Ophthalmologists:
You can also download Understanding Nystagmus in Word.
Image taken from uk.optelec.com