Which of the following is NOT one of the five standard ERG tests?

• A. Weak flash
• B. Strong flash to dark adapted eye
• C. Oscillatory potentials
• D. Color flicker test

Answer: (D)

In ERG testing, there is a standardized battery of responses that probe different retinal pathways: a dim flash in dark adaptation to isolate rod activity, a bright flash in dark adaptation to evoke the maximal scotopic (rod) response, a photopic single flash to test cone-driven function, a photopic 30 Hz flicker to assess cone function with rapid stimulation, and oscillatory potentials that reflect inner retinal activity. A color flicker test isn’t part of this ISCEV-standard set; it would assess chromatic or color processing rather than the retina’s electrical responses to luminance changes. The other options correspond to the actual standard tests: dim flash for rods, strong dark-adapted flash for the maximal response, oscillatory potentials, and the photopic 30 Hz flicker.