American Board of Opticianry (ABO) Practice Test

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Prepare for the ABO (American Board of Opticianry) Test with interactive flashcards and hundreds of multiple choice questions. Updated for 2024 to help you excel on exam day

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What is the optical center of a lens?

  1. the speed of light in air divided by the speed of light in the material

  2. the single point on an optical lens through which light may pass without being deviated

  3. an eye which requires a different correction in different meridians can be corrected with these type of lenses

  4. the total power of the lens

The correct answer is: the single point on an optical lens through which light may pass without being deviated

The optical center of a lens refers to a single point on the lens through which light can pass without being deviated. This is what allows light to be properly focused and creates clear images. Option A is incorrect because the ratio of the speed of light in air and in the material does not determine the optical center. Option C is incorrect because it describes a different type of lens used for correcting vision in individuals with different needs in different directions. Option D is incorrect because the total power of the lens does not determine the location of the optical center. Only option B correctly describes the concept of the optical center of a lens.

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