Certified Ophthalmic Assistant Practice Exam

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What is the reading portion of a bifocal prescription referred to as?

Addition
Correction
Segment
Index

The correct answer is: Addition

The reading portion of a bifocal prescription is accurately referred to as the addition. This term signifies the additional lens power that is needed to assist with near vision, complementing the distance prescription. Bifocals are designed to help individuals who have difficulty seeing both far and near, typically due to presbyopia. The addition is calculated based on the difference in prescription strengths required for distance versus near vision. The reading segment itself is part of the design of bifocals, which physically incorporates the necessary power for close-up tasks. Meanwhile, correction generally refers to the overall improvement in vision provided by the lenses, rather than specifically identifying the reading portion. The index pertains to the refractive index of the lens material and does not specifically refer to the reading portion in a bifocal context. Therefore, the term "addition" is the most accurate in describing the additional power needed for near vision in bifocal lenses.