In ERG testing, what does a weak flash in a dark-adapted eye primarily assess?

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Multiple Choice

In ERG testing, what does a weak flash in a dark-adapted eye primarily assess?

Explanation:
In ERG testing, a weak flash given to a dark-adapted eye primarily assesses the rod system. Rods are highly sensitive and mediate vision in very dim light, so after dark adaptation they respond to faint stimuli while cones stay relatively inactive. This makes the scotopic ERG waveform largely driven by rod photoreceptors and the downstream bipolar cells they feed. A brighter flash would recruit cones and blur the rod-specific response, whereas the weak stimulus keeps the response dominated by rods.

In ERG testing, a weak flash given to a dark-adapted eye primarily assesses the rod system. Rods are highly sensitive and mediate vision in very dim light, so after dark adaptation they respond to faint stimuli while cones stay relatively inactive. This makes the scotopic ERG waveform largely driven by rod photoreceptors and the downstream bipolar cells they feed. A brighter flash would recruit cones and blur the rod-specific response, whereas the weak stimulus keeps the response dominated by rods.

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