What percentage of UV light can a typical clear plastic lens block?

A typical clear plastic lens blocks approximately 10% of UV light. This means that while they do offer some level of protection against harmful ultraviolet rays, the majority of UV light can still penetrate through. This is significant to understand, especially when considering eye protection and the potential risks associated with prolonged exposure to UV radiation, such as cataracts and other eye conditions. Clear plastic lenses are not specifically designed to provide UV protection, which is why the percentage blocked is relatively low. In contrast, lenses that are labeled UV-blocking or that have special coatings can provide much greater protection against UV light. This distinction underscores the importance of selecting appropriate eyewear for effective UV protection.