Certified Paraoptometric (CPO) Practice Exam 2025

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the Certified Paraoptometric Exam with our comprehensive quiz featuring multiple-choice questions. Each question is accompanied by hints and explanations, helping you build your knowledge and confidence. Get ready to excel in your career!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the measurement from edge to edge of a lens called?

Overall Diameter
Lens Width
Frame Size
Lens Height

The correct answer is: Overall Diameter

The term that refers to the measurement from edge to edge of a lens is commonly known as overall diameter. This measurement is crucial in the fitting of lenses into frames and ensures that the lenses match the designed specifications for optimal vision correction and aesthetic appeal. In contrast, lens width specifically pertains to the horizontal measurement of a lens, which is crucial for understanding how the lens will fit within the frame but does not cover the complete span from edge to edge. Frame size typically refers to the overall dimensions of the eyewear frame, which includes the lenses but is broader in context. Lastly, lens height measures the vertical distance of the lens and is important for progressive lenses but does not represent the edge-to-edge measurement. Understanding these distinctions is vital in the field of optometry and when dealing with corrective eyewear.