Certified Paraoptometric (CPO) Practice Exam 2025

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What factors significantly impact the comfort of a contact lens?

  1. Color and design of the lens

  2. The edge thickness of a contact lens

  3. The brand of the contact lens

  4. The lens diameter

The correct answer is: The edge thickness of a contact lens

The edge thickness of a contact lens is a crucial factor influencing wearer comfort. Thinner edges are generally more comfortable as they create less awareness of the lens in the eye and reduce potential irritation. A lens with a thicker edge may cause discomfort due to increased friction with the eyelid during blinking. While color and design, brand, and lens diameter can affect various aspects of lens performance and aesthetics, they do not play as significant a role in overall comfort compared to the edge thickness. The design might affect how the lens fits or how it looks, the brand may relate to quality or materials used, and the diameter can influence fit but not directly comfort in the same way that edge thickness does. Edge thickness is about the physical properties that directly interact with the eyelids and the eye itself during normal wear, making it the most critical factor in ensuring comfort.

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