American Board of Opticianry (ABO) Practice Test

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Where is the add power etched on a lens?

  1. On the temporal side of the lens

  2. The point where lines that bisect the horizontal and vertical measurements of the lens in the boxing system intersect

  3. Colmascope

  4. Provides approximately 43 diopters of power to an eye's refractive system

The correct answer is: On the temporal side of the lens

The correct answer is on the temporal side of the lens. The add power, which is the additional power needed for close-up vision in a bifocal or progressive lens, is typically etched or marked on the temporal side of the lens. This makes it easily visible for the optician or wearer when determining the correct lens to use for near vision tasks. Option B refers to the boxing system for marking lenses, which is not directly related to the location of the add power on the lens. Option C (Colmascope) is a device used to analyze lens prescriptions and not related to marking add power. Option D mentioning 43 diopters of power is not relevant to the location of the add power on the lens.

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