If a plus aspheric lens has a decreased center thickness compared with the equivalent plus spherical lens, which other properties change?

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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

If a plus aspheric lens has a decreased center thickness compared with the equivalent plus spherical lens, which other properties change?

Explanation:
When a plus aspheric lens is made thinner at the center compared with the equivalent plus spherical lens, the overall amount of material in the lens is reduced. Since lens weight is tied to its volume (with constant material density), a reduction in center thickness lowers the total volume and thus the weight. The optical power can be kept the same by reshaping the surfaces, redistributing material without changing the focal outcome. So the lens is lighter and less voluminous.

When a plus aspheric lens is made thinner at the center compared with the equivalent plus spherical lens, the overall amount of material in the lens is reduced. Since lens weight is tied to its volume (with constant material density), a reduction in center thickness lowers the total volume and thus the weight. The optical power can be kept the same by reshaping the surfaces, redistributing material without changing the focal outcome. So the lens is lighter and less voluminous.

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