Fig. 16. Dark adaptation curve for an individual with congenital stationary night blindness (filled circles). The dark adaptation curve for normals is shown below. Note the absence of the cone-rod break near 10 minutes. (Carr RE. Congenital stationary nightblindness. In Heckenlively JR, Arden GB [eds]: Principles and Practices of Clinical Electrophysiology of Vision, p 713. St Louis: Mosby, 1991.)