Rod density is greatest approximately how many millimeters from the fovea?

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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

Rod density is greatest approximately how many millimeters from the fovea?

Explanation:
Rods peak outside the fovea in a parafoveal region. The fovea is dominated by cones and has very few rods, so the greatest rod density occurs a short distance away. In practical terms, about 5 millimeters from the fovea corresponds to the peak rod density (roughly aligned with about 20 degrees of visual angle). Closer than that, rods are scarce; farther out, density falls off. So the best answer is around 5 mm from the fovea.

Rods peak outside the fovea in a parafoveal region. The fovea is dominated by cones and has very few rods, so the greatest rod density occurs a short distance away. In practical terms, about 5 millimeters from the fovea corresponds to the peak rod density (roughly aligned with about 20 degrees of visual angle). Closer than that, rods are scarce; farther out, density falls off. So the best answer is around 5 mm from the fovea.

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