Certified Ophthalmic Assistant Practice Exam

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What is the reading portion of a bifocal prescription known as?

Segment
Transition
Segment line
Addition

The correct answer is: Addition

The reading portion of a bifocal prescription is known as the "Addition." This is because the addition is the extra power that is added to the lower part of the prescription to help with near vision tasks. The segment, transition, and segment line are not terms used to describe the reading portion of a bifocal prescription.