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Cone-rod dystrophy

Cone-rod dystrophy is less common than rod-cone dystrophy with an incidence of approximately 1 in 80,000.

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Gyrate Atrophy

This very rare condition is associated with a deficiency in the enzyme ornithineaminotransferase.

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Refsum syndrome

In Refsum syndrome, visual impairment is accompanied by hearing loss, neurological problems, heart problems, dry or flaky skin, loss of sense of smell, and oddly shaped red blood cells.

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NARP syndrome

People with NARP (Neuropathy, Ataxia and Retinitis Pigmentosa) syndrome have neurological (muscle weakness, epilepsy and memory problems) and balance problems in addition to retinitis pigmentosa.

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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).

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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).