CNGA1 and retinitis pigmentosa 1: Exome sequencing was done for 13 patients in the typical RP group, and revealed EYS (2 patients, c.4957dupA homozygous and c.4957dupA/c.8805C>A), RHO (1 patient, c.44A>G), CEP164 (1 patient, c.452G>A homozygous) and CNGA1 (1 patient, c.398delG/c.1196A>G) as causative genes.