How are people exposed to UV radiation?

Sunlight

Sunlight is the main source of UV radiation. Different types of UV rays reach the ground in different amounts. About 95% of the UV rays from the sun that reach the ground are UVA rays, with the remaining 5% being UVB rays.

The strength of the UV rays reaching the ground depends on:

Time of day: UV rays are strongest between 10 am and 4 pm.

Season of the year: UV rays are stronger during spring and summer months. This is less of a factor near the equator.

Distance from the equator (latitude): UV exposure goes down as you get farther from the equator.

Altitude: More UV rays reach the ground at higher elevations.

Clouds: The effect of clouds can vary, but what's important to know is that UV rays can get through to the ground, even on a cloudy day.

Reflection off surfaces: UV rays can bounce off surfaces like water, sand, snow, pavement, or even grass, leading to an increase in UV exposure.

Contents of the air: Ozone in the upper atmosphere, for example, filters out some UV radiation.

Spin coating is Zinff's independently developed technique for applying thin films to the lens's outer surface. When a solution of a material and a solvent is spun at high speeds, the centripetal force and the surface tension of the liquid together create an even covering.

Zinff's photochromic coating makes the color more stable after the lenses darken by exposure to the UV rays. When the lenses don't darken, the lens color is close to colorless. Besides, the coating makes the lenses darken and fade faster than the other photochromic lenses, even faster than Transition® Photochromic. However, Zinff's photochromic lenses have a longer service life than ordinary photochromic lenses.

Zinff's photochromic lenses are more scratches resistant. The lenses can anti static, glare and UV rays. Besides, the lenses with this type of coating are easy to clean.