Figure 4. Electroretinography and S-Cone ERG findings in case 2. A: ERG findings in case 2. ERG shows severely reduced rod specific responses, response to standard flash was delayed with low amplitude waveform under photopic and scotopic conditions, the 30 Hz flicker was delayed and of lower amplitude. B: S-Cone ERG with blue flash and orange background showing abnormally large, delayed, simplified waveform as enhanced S cone ERG responses.