How much UV is absorbed by a clear crown glass lens?

Clear crown glass lenses are designed to have minimal optical interference and are used widely in applications such as eyeglasses and optical instruments. One of their characteristics is their ability to transmit visible light while absorbing a certain amount of ultraviolet (UV) radiation.

The correct choice highlights that clear crown glass lenses absorb approximately 9% of UV radiation. This absorption is particularly important because UV radiation is known to have harmful effects on the eyes, such as contributing to cataract formation and other ocular conditions. By absorbing a portion of UV light, clear crown glass lenses provide some level of protection against these risks while still allowing for clear visibility and minimal distortion in the areas of the visible spectrum. Understanding this absorption can help users select appropriate eyewear for UV protection, particularly when engaging in outdoor activities or in environments with high UV exposure.

While other percentages are given as options, they either overstate or understate the typical absorption capability of clear crown glass, as most studies and optical testing indicate 9% is a reliable figure for the UV absorption of this type of lens.