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Eye scans could in the future be used to calculate your risk of dying, researchers have suggested.
Academics claim the retina acts as a 'window' in allowing doctors to take a deeper look at someone's health.
And Australian scientists have now linked a bigger 'retinal age gap' to a heightened risk of death.
The gap is the difference between someone's chronological age and the estimated biological age of their retina.
The latter can be calculated by an AI programme that analyses images taken of the fundus, the internal back surface of the eye. Some high street opticians offer these scans.
People with gaps of a decade were up to 67 per cent more likely to die, according to Australian experts who tracked volunteers for 11 years.
Academics calculated there was a 2 per cent increased risk of death for every year of gap.
Experts analysed retina scans taken from 36,000 Britons, they found those with retinas older than their biological age were at increased risk of death. Each one year gap between a person's retina age and their biological age was associated with a 2 per cent increased risk of death