What Does Electroretinography Measure

What does electroretinography measure?

A) A fluorescein dye is injected intravenously (IV) into a vein in the arm, and the retina is observed as the dye circulates.
B) Electrodes are placed on the scalp, each eye is stimulated, and retinal activity is assessed.
C) A small plunger is used to apply pressure on the sclera while the retinal vessels are evaluated.
D) A contact lens electrode is placed on the eye and exposed to flashes of light to evaluate the retinal response.

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