What is the effect of UV protective coating on lenses?

The effect of UV protective coating on lenses is primarily to protect the eyes from harmful ultraviolet (UV) rays. This coating helps to block a significant amount of UV radiation that can lead to various eye health issues, such as cataracts and sun-related eye conditions. By filtering out these harmful rays, the coating plays a crucial role in safeguarding visual health, especially during prolonged outdoor exposure to sunlight.

While the other options present various aspects of lens functions, they do not accurately describe the primary function of UV protective coatings. Enhancing vision in bright environments typically involves anti-reflective or polarized coatings rather than just UV protection. Preventing fading of the lens material may relate to other protective coatings but is not the main purpose of UV protection. Similarly, the thickness of the lens is dictated by the lens prescription and material rather than the presence of a UV coating. The primary focus of UV protective coatings is the protection they offer to the eyes from harmful UV rays.