The average power of the crystalline lens is approximately how many diopters?

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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

The average power of the crystalline lens is approximately how many diopters?

Explanation:
The lens adds a substantial but smaller portion of the eye’s total focusing power, with an average around +18 diopters. In a typical, relaxed (unaccommodated) eye, the cornea contributes about +40 D and the crystalline lens about +18 D, giving a total near +60 D for the eye’s refractive power. The lens can increase its power when accommodating, but the standard resting value is about +18 D, which is why this option is the best choice. The other values are either too low or too high for the lens alone in the unaccommodated state.

The lens adds a substantial but smaller portion of the eye’s total focusing power, with an average around +18 diopters. In a typical, relaxed (unaccommodated) eye, the cornea contributes about +40 D and the crystalline lens about +18 D, giving a total near +60 D for the eye’s refractive power. The lens can increase its power when accommodating, but the standard resting value is about +18 D, which is why this option is the best choice. The other values are either too low or too high for the lens alone in the unaccommodated state.

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