Which term describes a lens with both surfaces convex?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Which term describes a lens with both surfaces convex?

Explanation:
A lens with both surfaces convex is described as bioconvex. The word bioconvex literally means two outward-curving (convex) surfaces, which make this type of lens converge light rays to a focal point and behave as a positive (converging) lens. In ophthalmic terms, it thickens at the center and is used to correct hyperopia (farsightedness). If a lens had one flat surface, the other side convex, that would be plano convex. If both surfaces curved inward, it would be bioconcave, a diverging lens. A meniscus lens has one surface that is more curved than the other, with one side concave and the other convex, so it isn’t two convex surfaces.

A lens with both surfaces convex is described as bioconvex. The word bioconvex literally means two outward-curving (convex) surfaces, which make this type of lens converge light rays to a focal point and behave as a positive (converging) lens. In ophthalmic terms, it thickens at the center and is used to correct hyperopia (farsightedness).

If a lens had one flat surface, the other side convex, that would be plano convex. If both surfaces curved inward, it would be bioconcave, a diverging lens. A meniscus lens has one surface that is more curved than the other, with one side concave and the other convex, so it isn’t two convex surfaces.

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