UV-A

Some Class 2 lenses beat the standard: Avaira, for example, block at least 75% of UV-A radiation and 99% of UV-B radiation, according to the package insert.

Contacts Let In Sun, But Block UV Rays Laura Johannes 2011

Only a limited number meet Food and Drug Administration standards for "Class 1" protection, in which 90% of UV-A radiation is blocked and 99% of UV-B radiation is blocked.

Contacts Let In Sun, But Block UV Rays Laura Johannes 2011

A number of other lenses on the market—including Cooper Companies Inc.'s Avaira and ClearSight product lines—meet Class 2 standards, in which 70% of UV-A and 95% of UV-B is blocked.

Contacts Let In Sun, But Block UV Rays Laura Johannes 2011

The thing is, those creams don't offer long-lasting protection against Ultraviolet-A rays (UV-A).

Jesse Kornbluth: Does The Sunscreen You Use On Your Face Contain Mexoryl? French Sunscreen Does. We Swear By It. 2010

Look for ones that block 99-100% of UV-A and UV-B rays.

Dr Luisa Dillner's guide to … hot weather 2010

Sunscreen will also protect you from UV-A rays, which are also linked to skin cancer.

Dr Luisa Dillner's guide to . . . applying sunscreen Dr Luisa Dillner 2010

As shown below, white ice (ice with air inclusions) has a strong attenuating = effect on PAR (visible light) and an even greater effect on UV-A and UV-B radiation.

Ultraviolet radiation effects on freshwater ecosystems in the Arctic 2009

Exposure to UV-A (315 – 400 nm) radiation induced some of the same negative effects on the immune system [31].

Effects of changes in ultraviolet radiation in the Arctic 2009

Derivation of UV-A irradiance from pyranometer measurements.

Long-term change and variability in surface UV irradiance in the Arctic 2009

These compounds absorb UV-A and UV-B radiation and short-wavelength visible light, and in high concentrations such as in arctic rivers they stain the water yellow or brown.

Ultraviolet radiation effects on freshwater ecosystems in the Arctic 2009