A high street eye scan could detect signs of Parkinson's up to seven years before a diagnosis, research suggests.High-resolution images of the retina are now a routine part of eye care — in particular, a type of 3D scan known as 'optical coherence tomography' (OCT) which is widely used in high-street opticians.In less than a minute, an OCT scan produces a cross-section of the retina - the back of the eye - in incredible detail, down to a thousandth of a millimetre.
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