BACKGROUND: Achromatopsia is a congenital, autosomal recessively inherited condition
in which cones are either defective or absent. Complete achromatopsia results from having
only rods as functioning photoreceptors. Many people with achromatopsia have small
amounts of residual cone function that may provide minimal color vision under special
circumstances. Clinical findings associated with the condition include reduced visual acuity,
nystagmus, a greater than normal incidence of high ametropia, and severe photophobia …