Bradyopsia

Bradyopsia, also known as "prolonged electro-retinal response suppression" is a visual condition in which the photoreceptor cells in the retina have a slower-than-normal recovery of light sensitivity after exposure to light. It is inherited as an autosomal recessive disease. It is uncommon with only a few dozen patients described in the medical literature as of 2025.

Because of the subtle nature of the symptoms, because many ophthalmologists and optometrists are unaware of it, and because non-standard electroretinogram (ERG) testing is needed to confirm the diagnosis, many cases are likely to be undiagnosed.