Oligocone trichromacy: clinical and molecular genetic investigations.

Purpose: To describe the phenotype and genotype of patients with a diagnosis of oligocone trichromacy (OT).

Methods: Six unrelated patients had a detailed ophthalmic examination including color vision testing, a Goldmann visual field test, fundus photography, and full-field electroretinography (ffERG). Five patients also underwent multifocal (mf)ERG, autofluorescence recording, and optical coherence tomography (OCT).