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

Explanation:
With a high plus lens, the way the lens is shaped to fit a tall frame changes where the material accumulates. When the frame has a large vertical dimension, the surfaces of the lens must bow more at the top and bottom to keep the prescribed optical power aligned with the frame geometry. That additional bending increases the sag in those regions, so more material is needed there, making the top and bottom the thickest parts. The sides don’t experience that same vertical bowing, so they stay comparatively thinner.

With a high plus lens, the way the lens is shaped to fit a tall frame changes where the material accumulates. When the frame has a large vertical dimension, the surfaces of the lens must bow more at the top and bottom to keep the prescribed optical power aligned with the frame geometry. That additional bending increases the sag in those regions, so more material is needed there, making the top and bottom the thickest parts. The sides don’t experience that same vertical bowing, so they stay comparatively thinner.

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