Where is the main electrode placed during an ERG recording?

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Multiple Choice

Where is the main electrode placed during an ERG recording?

Explanation:
In an ERG recording, the active electrode should sit right on the cornea because you want the sensor as close as possible to the retina to pick up the retinal electrical response with low impedance. A corneal contact lens or similar corneal electrode directly near the retina captures the strongest, clearest signal from the photoreceptors and downstream retinal neurons. The iris and lens are internal structures and not accessible for effective recording, while the conjunctiva sits on the eye’s surface away from the retina, producing weaker signals and more noise. So the cornea is the optimal site for the main electrode.

In an ERG recording, the active electrode should sit right on the cornea because you want the sensor as close as possible to the retina to pick up the retinal electrical response with low impedance. A corneal contact lens or similar corneal electrode directly near the retina captures the strongest, clearest signal from the photoreceptors and downstream retinal neurons. The iris and lens are internal structures and not accessible for effective recording, while the conjunctiva sits on the eye’s surface away from the retina, producing weaker signals and more noise. So the cornea is the optimal site for the main electrode.

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