If an ERG has a d-wave, is it scotopic or photopic?

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Multiple Choice

If an ERG has a d-wave, is it scotopic or photopic?

Explanation:
A d-wave is the cone-driven OFF response seen in photopic ERGs. It arises when the cone pathway, emphasized under light-adapted (cone) conditions, responds to the offset of a light stimulus. Rod-dominated, scotopic recordings do not produce a prominent d-wave, since they are driven mainly by rod activity. So seeing a d-wave indicates cone involvement, i.e., a photopic condition. The other choices don’t fit because scotopic ERGs are dominated by rod responses with little to no d-wave, and “both” or “neither” would not match the cone-specific OFF response reflected by the d-wave.

A d-wave is the cone-driven OFF response seen in photopic ERGs. It arises when the cone pathway, emphasized under light-adapted (cone) conditions, responds to the offset of a light stimulus. Rod-dominated, scotopic recordings do not produce a prominent d-wave, since they are driven mainly by rod activity. So seeing a d-wave indicates cone involvement, i.e., a photopic condition. The other choices don’t fit because scotopic ERGs are dominated by rod responses with little to no d-wave, and “both” or “neither” would not match the cone-specific OFF response reflected by the d-wave.

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