Cancer-associated retinopathy. A and B, Fundus photographs show mild arteriolar attenuation and findings of macular drusen and trace epiretinal membrane in the left eye. C–G: Full-field electroretinography testing is not recordable under scotopic conditions, and the maximum combined response is nearly extinguished. C, Dark-adapted, rod-specific response. D, Dark-adapted, mixed rod–cone response. E, Oscillatory potentials. F, Light-adapted, photopic single flash. G, Light-adapted, photopic flicker.