The optic nerve is located approximately ____________ degrees nasally away from fixation.

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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

The optic nerve is located approximately ____________ degrees nasally away from fixation.

Explanation:
The optic nerve head sits on the nasal side of the retina at about 15 degrees away from the fovea, which is where we fixate. This nasal location comes from how retinal nerve fibers converge to form the optic nerve and how the visual field is mapped onto the retina. Because the disc is nasal to the fovea, the corresponding blind spot in the visual field appears roughly 15 degrees temporally from fixation. So the standard, anatomically typical distance is about 15 degrees. Distances like 10, 20, or 25 degrees are less representative of this normal arrangement.

The optic nerve head sits on the nasal side of the retina at about 15 degrees away from the fovea, which is where we fixate. This nasal location comes from how retinal nerve fibers converge to form the optic nerve and how the visual field is mapped onto the retina. Because the disc is nasal to the fovea, the corresponding blind spot in the visual field appears roughly 15 degrees temporally from fixation. So the standard, anatomically typical distance is about 15 degrees. Distances like 10, 20, or 25 degrees are less representative of this normal arrangement.

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