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Charles Bonnet syndrome

Charles Bonnet syndrome (CBS) causes people who have lost a lot of sight to see things that aren’t real (hallucinations).

A man looking into an eye examination device

Bassen-Kornweig syndrome

In this condition, retinitis pigmentosa is accompanied by progressive neurological problems, abnormal red blood cells (acanthocytosis) and defective bowel absorption of fat, leading to very low blood levels of cholesterol and absent beta lipoprotein (Abetalipoproteinaemia).