A routine eye test could spot signs of Alzheimer’s disease years before symptoms first appear, promising research has suggested.

Experts from City St George’s, University of London say early stage cognitive decline could soon be picked up by an AI tool rolled out in opticians and ophthalmologist offices that measures changes to blood vessels in the back of the eye.

The tool, which is being tested using the health records of more than 500,000 Britons, could help dementia patients be identified and treated before the disease significantly damages their brain.

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