For a high minus lens with a large frame difference, where will the lens be thickest?

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Prepare for the Ophthalmic Optics Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

For a high minus lens with a large frame difference, where will the lens be thickest?

Explanation:
For a minus (concave) lens, thickness grows as you move away from the optical center—the center is the thinnest and the periphery gets thicker. If the frame is much wider than tall (a large frame difference), the distance from the center to the left and right edges is greater than the distance to the top and bottom edges. Since thickness increases with that radius, the sides (the horizontal edges) become the thickest part of the lens. The center is the thinnest, and the top/bottom are not as thick as the sides in this situation.

For a minus (concave) lens, thickness grows as you move away from the optical center—the center is the thinnest and the periphery gets thicker. If the frame is much wider than tall (a large frame difference), the distance from the center to the left and right edges is greater than the distance to the top and bottom edges. Since thickness increases with that radius, the sides (the horizontal edges) become the thickest part of the lens. The center is the thinnest, and the top/bottom are not as thick as the sides in this situation.

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