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Bradyopsia is characterised by prolonged electroretinal response suppression leading to difficulties adjusting to changes in luminance, normal to subnormal acuity and photophobia.
ORPHA:75374Classification level: Disorder
It has been described in five unrelated patients with symptoms present since childhood.
The disorder is caused by recessive mutations in the RGS9 (chromosome 17q23-q24) or R9AP (chromosome 19q13.11) genes.