A strong flash delivered to a dark-adapted eye reflects activity of which photoreceptors?

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Multiple Choice

A strong flash delivered to a dark-adapted eye reflects activity of which photoreceptors?

Explanation:
A strong flash in a dark-adapted eye engages both types of photoreceptors. Rods are incredibly sensitive and drive vision in low light, but when the light is bright enough, cones also respond. So, the response to a powerful flash reflects input from both rods and cones, not just one type. Amacrine cells are inner-retina neurons and are not photoreceptors, so they don’t reflect photoreceptor activity. This overlap—rods handling low light and cones kicking in with bright stimuli—explains why both contribute to the flash response.

A strong flash in a dark-adapted eye engages both types of photoreceptors. Rods are incredibly sensitive and drive vision in low light, but when the light is bright enough, cones also respond. So, the response to a powerful flash reflects input from both rods and cones, not just one type. Amacrine cells are inner-retina neurons and are not photoreceptors, so they don’t reflect photoreceptor activity. This overlap—rods handling low light and cones kicking in with bright stimuli—explains why both contribute to the flash response.

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