Certified Paraoptometric (CPO) Practice Exam

SPF in the context of sunglasses indeed indicates the level of UV protection that the lenses offer. While SPF is commonly associated with sunscreen, its principle applies to sunglasses as well. Sunglasses with a higher SPF rating are designed to block a greater percentage of harmful ultraviolet (UV) rays from the sun, reducing the risk of eye damage and conditions such as cataracts. This means that the higher the SPF, the more effective the sunglasses are at providing protection against UV radiation.

The other options address unrelated or irrelevant aspects of sunglasses. The color of the lenses may influence vision comfort and aesthetics but does not correlate to UV protection levels. Similarly, the weight of the glasses and the style of the frame pertain to comfort and fashion but have no bearing on the UV safety offered by the sunglasses. Thus, understanding that SPF specifically relates to UV protection is crucial for ensuring eye health while enjoying outdoor activities.