Certified Paraoptometric (CPO) Practice Exam 2025

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What does the base curve radius (BCR) refer to in contact lenses?

The thickness of the lens
The primary curve on the lens's surface
The diameter of the lens
The overall weight of the lens

The correct answer is: The primary curve on the lens's surface

The base curve radius (BCR) refers to the primary curve on the lens's surface, which is crucial for determining how the contact lens fits on the cornea. The base curve is essentially the curvature of the back surface of the lens; it plays a vital role in the lens's overall comfort and effectiveness in correcting vision. A well-fitted base curve aligns with the natural curvature of the eye, allowing for proper positioning of the lens and optimal vision correction. Understanding the base curve radius helps in fitting contact lenses properly, ensuring that they do not move excessively on the eye, which could cause discomfort or vision disturbances. This aspect is particularly important in managing a variety of corneal shapes and sizes among patients. The options related to thickness, diameter, and overall weight do not directly pertain to the curvature relevant to fitting in this context, making them less relevant when discussing the BCR in contact lenses.