Certified Paraoptometric (CPO) Practice Exam 2025

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What is the advantage of High-Index Lenses?

  1. They are the most durable

  2. They are the least expensive

  3. They provide a better cosmetic appearance for higher prescriptions

  4. They offer the highest scratch resistance

The correct answer is: They provide a better cosmetic appearance for higher prescriptions

High-Index Lenses are designed to be thinner and lighter than standard lenses, particularly beneficial for individuals with higher prescriptions. The advantage of a better cosmetic appearance comes from the fact that, as the prescription strength increases, traditional lenses can become quite thick and heavy, which can be uncomfortable and unappealing. High-Index Lenses reduce this thickness, allowing them to maintain a more aesthetically pleasing profile. This is especially significant for patients who may be self-conscious about the bulkiness of thick lenses, thereby enhancing their overall confidence and comfort when wearing glasses. The other options, while they may have their own benefits in different contexts, do not correctly define the key advantage of High-Index Lenses. For example, durability and scratch resistance vary among lens materials and coatings, and cost-effectiveness is not necessarily a characteristic of high-index materials, which often come at a premium compared to standard options.

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