What are sunglasses hev?
The best quality sunglasses today block virtually all ultraviolet (UV) rays, but many scientists now believe that rays in a row almost UV can also cause eye damage over time. The range of almost UV is called visible high -energy (HEV) because it includes visible blue/purple light. Hev sunglasses filter out much of this spectrum. Macular degeneration is a retinal condition that causes a loss of fine detail in vision. This is a chronic condition without drug. Eye protection from light almost UV with sunglasses HeV can help prevent potential problems later. If damage has already been damaged, HEV sunglasses can minimize future exposure, which reduces damage.
UV spectrum is divided into subcategories by wavelengths measured by nanometers (Nm). One nanometer is one billion meter (3.3 feet). HEV series incl.
Specifications for sunglasses hev noticed that they block almost uv light, blue light or hev light. All three terms apply to the same thing. Specifications can also indicate the threshold, for example "blocks blue light on 450 nm".
HEV sunglasses with yellow clarified lenses block complete spectrum and distort color perception of color completely eliminating blue. This could be difficult, for example, for artists who work outdoors or for people who can have a heavy resolution of traffic lights. Many people also simply prefer some blue light and find yellow lenses rough. To stay closer to the true perception of colors, you may want to choose HEV sunglasses with amber or melanin lenses, the other offering the most true perception of colors between HEV sunglasses.
In addition to filtering although blue light, sunglasses Hev should block 100% UV-A and UV-B beams. SpecificationsThey can also mention the UV-C rays, but this form does not penetrate the Earth's atmosphere, so protection is somewhat irritated.
baby eyes are particularly sensitive to the hev and UV rays, because the lens of the eye has not yet developed natural protection that blocks at least some UV and hev light. The ocean, sand, pools, sidewalks and snowy landscapes reflect and intensify the exposure to HEV and UV. Children's sunglasses HEV with 100% UV-A and UV-B protection can protect the child's eyes and potentially reduce the chance of later-related eye diseases. The images should fit comfortably around the face in the style of wrapping so that sunlight can not enter the eyes of unfiltered.
Although high -quality branded sunglasses are available from companies such as Oakley, Maui Jim, Uvex and Revo, there are also many quality brands name that are not protection of HeV. The IS price is not an indicator or dark lens. If sunglasses are blocking a significant part of the spectrum of HEV, this will be marked together with “100% UV protectionou ". Eye protection (EPF) assessment (EPF) also publishes how much light of HEV is blocked.
Today there is no reason to risk vision by buying sunglasses with less than 100% UV protection and significant HEV filtering. HEV sunglasses are available wherever fine sunglasses are sold. For cruise, skiing, skiing, climbing and other outdoor activities where the reflection is a problem, there are also polarized HEV sunglasses.