Is UV 400 the same as polarized?
Polycarbonate lenses tend to be the best choice for sunglasses because they are lightweight and significantly more impact resistant than lenses made of glass or other materials. ‘UV400’ refers to UV rays at the top end of the UV spectrum, up to the 400-nanometre wavelength. Sunglasses with this level of protection block a straight wider spectrum than the CE and British Standard models, making them the ultimate protection for your eyes.
Excessive and ongoing exposure to UV light is linked to diseases like cataracts, glaucoma, and age-related macular degeneration. While UV-rated lenses shield your eyes from the harmful rays on sunny days, whereas polarized sunglasses reduce glare that causes discomfort. If those sunglasses with dark lenses don’t include UV protection, those darker shades are in fact worse for your eyes than not wearing any protective eyewear at all.
UV protection on your glasses and sunglasses lenses may help avoid the damage UV radiation can do to your eyes. UV coating can be applied to any plastic or glass lenses for maximized protection. Mountain climbing or traveling across glaciers or snowfields requires above-average eye protection, because sunlight is more intense in higher altitudes, and snow and ice reflect additional light.
- In 1913, Crookes lenses were introduced, created from glass containing cerium, which completely blocked ultraviolet light.
- I’m not just discussing polarized lenses and UV shielding.
- So the lenses don’t get activated when you’re in a car.
- Simultaneously, sunglasses began to be used as aids for pilots and also produced for the gaining aviation sector, eventually adding to sunglasses as cultural icons and to their popularity.
Popular glasses because of this use are a type called glacier glasses or glacier goggles. They typically have very dark round lenses and leather blinders at the sides, which protect the eyes by blocking natural sunlight around the edges of the lenses. Lenses of fixed tint are graded according to the optical density of the tint; in the UK sunglasses should be labelled and show the filter category number.
- While polarized lenses work to shield your eyes against glare and harmful Ultra violet rays, blue light filter lenses exceed just polarization.
- The UV protection is made into the lens, so it won’t fade or disappear as time passes.
- Polarizing lenses are a choice on all of Knockaround’s best sellers and custom frames.
for direct viewing of sunlight. This kind of eyewear can filter UV radiation bad for the eyes. This is not correct because the color of the sunglasses lenses gives no indication of the sunlight filtering.
Nylon frames are usually used in sports because they’re lightweight and flexible. They are able to bend slightly and go back to their original shape instead of breaking when pressure is put on them. This flex can also help the glasses grip better on the wearer’s face. Metal frames are often more rigid than nylon frames, thus they may be more easily damaged once the wearer participates in sport activities, but this is not to say that they cannot be useful for such activities. Because metal frames tend to be more rigid, some models have spring loaded hinges to help them grip the wearer’s face better.
