Final answer:
Goggles made from polycarbonate or plastic lenses can effectively block UV rays, with polycarbonate providing the most protection. Sunscreens with an SPF of 30 filter up to 97% of UVB rays, as recommended by health organizations. Proper eye and skin protection is essential in preventing cataract formation and protecting immune system health.
Step-by-step explanation:
Protective eyewear, such as goggles, can block UV rays to varying degrees, depending on the materials used. Ordinary prescription glasses provide some level of protection, but most plastic lenses offer more UV protection than glass lenses. Polycarbonate lenses are especially effective, often blocking most UV radiation. Similarly, most contact lenses are designed to absorb UV radiation, aiding in the protection of the retina. It is also worth noting that wearing UV protective clothing, identified by its UPF rating, can complement eye protection by guarding against both UVA and UVB rays.
The efficiency of sunglasses in blocking UV rays can vary widely. For instance, a sun protection factor (SPF) is used to measure the protection offered by sunscreens against UVB rays, but it does not measure protection from UVA radiation. The American Academy of Dermatology recommends using sunscreen products with at least SPF 30, which can filter out up to 97% of UVB rays. It is important to consider both types of UV radiation when looking at protection since exposure may lead to serious eye health issues like cataracts, which can be prevented with effective eyewear.