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.

Which of the following refers to air spaces within the bones?

Macula
Sinuses
Cones
Rods

The correct answer is: Sinuses

The correct answer is sinuses. Sinuses are air-filled cavities located within certain bones of the skull, specifically the facial bones and cranial bones. These spaces help reduce the overall weight of the skull, contribute to sound resonance, and assist with the regulation of temperature and humidity in the air we breathe. The other terms listed do not refer to air spaces within bones. Macula refers to a specific area in the retina responsible for central vision. Cones are photoreceptor cells in the retina that function in color vision and visual acuity. Rods are another type of photoreceptor in the retina that are primarily responsible for vision in low-light conditions. Each of these choices pertains to components of the visual system, rather than to anatomical structures related to air spaces in bones.