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A jury heard his optometrist Honey Rose failed to notice that the boy, from Suffolk, had swollen optic discs, an abnormality which is a symptom of hydrocephalus - fluid on the brain.

The optic disc is the area where the nerves carrying visual information connect to the brain.

Using photographs of the optic disc and other diagnostic techniques, they recorded instances of glaucoma in 2005 and 2006, and correlated them with reports of beverage consumption over the previous year.

The case centred around Rose's failure to detect swollen optic discs while working as a locum at the Boots store and her failure to refer Vinnie for further investigation.

The optic disc appeared somewhat cloudy, with very evident venous pulsation.