Figure 7: Typical electroretinogram in enhanced S-cone syndrome. The top row shows the ERG in a normal individual. Second and third rows show ERG of right and left eyes of a 7-year-old male (patient no. 11). The simplified scotopic 3.0 waveform [1^st column] is similar to the photopic 3.0 waveform [2^nd column] as both are dominated by the short-wavelength-sensitive mechanisms. Specific chromatic stimulation shows nearly non-detectable L- and M- cone responses [4^th column] and supernormal S-cone responses [5^th column]. Other features include delayed and reduced 30 Hz flicker[3^rd column]