Rods to cones in the retina are numerically distributed as roughly which ratio?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Rods to cones in the retina are numerically distributed as roughly which ratio?

Explanation:
Rods are far more numerous than cones in the retina. Overall counts are about 120 million rods and 6 million cones, giving a ratio of roughly 20:1. This supports peripheral light sensitivity and night vision (rods) while central, high-acuity color vision relies on cones concentrated in the fovea. The other options don’t fit the actual numbers: 1:1 and 2:1 understate the rod predominance, and 100:1 would require many more rods than are present.

Rods are far more numerous than cones in the retina. Overall counts are about 120 million rods and 6 million cones, giving a ratio of roughly 20:1. This supports peripheral light sensitivity and night vision (rods) while central, high-acuity color vision relies on cones concentrated in the fovea. The other options don’t fit the actual numbers: 1:1 and 2:1 understate the rod predominance, and 100:1 would require many more rods than are present.

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