Researchers are about to recruit almost 1,000 patients onto a study to establish which is the most effective diagnostic test for glaucoma.

It is estimated that around 4,000 people are registered blind or partially sighted in the UK each year because of the eye disorder.

Diagnosing glaucoma can be difficult but new diagnostic tests are available and easy to perform.

However there is a need for robust evidence to guide how best to use these tests which could be potentially very useful, particularly as eye clinicians are already dealing with high numbers of patients.