How much UV radiation do safety goggles block?

Safety goggles are specifically designed to provide protection to the eyes from harmful UV radiation. The effectiveness of safety goggles in blocking UV radiation is quantified by their ability to block both UVA and UVB rays.

The correct choice indicates that safety goggles block 99% of UVA rays and 99.9% of UVB rays. This high level of protection is crucial because both UVA and UVB rays can cause significant harm to the eyes, leading to conditions like cataracts or other forms of damage over time.

UVB rays are primarily responsible for sunburn and can also contribute to eye damage, while UVA rays can penetrate deeper into the skin and eyes. The design and materials used in safety goggles are specifically engineered to provide maximum coverage and block a significant percentage of these harmful rays.

In comparison to the other options, it is clear that only option A reflects the level of UV protection typically achieved by high-quality safety goggles. The other choices suggest lower levels of protection or inaccurate combinations of UVA and UVB blocking capabilities, which do not align with the protective characteristics of standard safety eyewear.