For a 5D hyperope wearing -5D contact lenses, what is the distal point?

Prepare for the NBEO Physiological Optics Test with flashcards and multiple choice questions, each offering hints and explanations. Equip yourself for your exam!

Multiple Choice

For a 5D hyperope wearing -5D contact lenses, what is the distal point?

Explanation:
Distal point refers to the location in space from which light must appear to come so that the eye, with relaxed accommodation, forms a sharp image on the retina. When a hyperope is corrected with a -5D contact lens, the overall optical power for distant objects becomes zero, effectively making the eye emmetropic for distance. With the eye relaxed, distant objects focus at infinity, so the distal point is at infinity. In other words, the correction neutralizes the hyperopia and aligns the eye’s relaxed focal point with infinity, making infinity the correct distal point.

Distal point refers to the location in space from which light must appear to come so that the eye, with relaxed accommodation, forms a sharp image on the retina. When a hyperope is corrected with a -5D contact lens, the overall optical power for distant objects becomes zero, effectively making the eye emmetropic for distance. With the eye relaxed, distant objects focus at infinity, so the distal point is at infinity. In other words, the correction neutralizes the hyperopia and aligns the eye’s relaxed focal point with infinity, making infinity the correct distal point.

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