Thousands of people with a debilitating eye disorder that causes involuntary blinking could be spared painful injections thanks to a simple device that clips on to spectacles.

The condition is known as blepharospasm and in sufferers the motor cortex – the part of the brain that controls voluntary muscle activity such as blinking – becomes ‘over-excited’.

Signals travel down nerve pathways in the temples, prompting the muscle that surrounds the eye to close uncontrollably.

Current treatment includes Botox jabs around the eyes to weaken the muscles.

Now experts at John Radcliffe Hospital, Oxford, are testing a device called Pressop, which clips on to a patient’s glasses and puts pressure on the temple to block the faulty nerve impulses.

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