Photoreceptor function in heterozygotes with insertion or deletion mutations in the RDS gene.

Heterozygotes with these different peripherin/RDS gene mutations showed variation in clinical presentation but a similar pattern of receptor abnormalities. Results of visual function tests were consistent with a normal amount of rod and cone outer segment membrane in early disease, progressing to reduced outer segments at later stages. There was an equal effect on rod and cone photoreceptor function at all stages of disease. This functional phenotype may represent the human analogue of the rds/+ mouse.