Views:2 Author:Site Editor Publish Time: 09-16-2019 Origin:Site
A low VLT number such as 15 percent means less eye fatigue on sunny days. And a high VLT number such as 70 percent means better color and depth perception on low-light days.
In low light and fog, yellow, gold and amber lenses filter out blue light, emphasizing shadows in the snow so you can see bumps better. They also work well in moderate and variable light conditions.
Light rose and rose copper lenses are also excellent on low-light days.
In bright light, dark tints such as copper, dark brown, dark gray and dark green will keep your eyes more comfortable while they increase contrast. Gray lenses are also good for letting you see true colors.
A mirror (or "flash") coating enhances the effectiveness of tinted lenses by reflecting sunlight so it doesn't penetrate the lens. This lowers the VLT of the lens and makes it a great choice for bright, sunny days.
For sunset and nighttime, use only clear lenses, since they have the highest VLT, allowing the most light to come into your eyes.
Consider goggles with photochromic lenses, which become lighter or darker automatically, as the light changes. Usually they are available in either gray or brown.
Interchangeable lenses are becoming more common in ski goggles and sports sunglasses. They let you switch lenses when light conditions change.
Polarized lenses reduce glare from sunlight reflecting off the slopes and are great when it's bright out. But they may not be ideal near the end of the day when long shadows appear in the snow, because they usually are made with a darker tint than most sun lenses.
UVA and UVB are the most important rays to guard against. Too much exposure to UV on a short-term basis can give you a painful sunburn on your eyes, called photokeratitis. Long-term, UV rays can damage your eyes permanently and may lead to cataracts and other eye diseases. Look for goggles and sunglasses that block 100 percent of these rays, which bounce off the snow and into your eyes even on cloudy days.
Newer, lower-profile styles fit better with a helmet and look cooler than traditional styles with large lenses. But if you choose the low-profile look, make sure you have enough peripheral (side) vision — some goggles skimp out on that.
Ideally, you should be able to see 180 degrees from side to side, to help you avoid skiers and riders. If you prefer sunglasses, choose a wrap style with the least amount of distortion at the sides that you can find.
Take the time to adjust the strap to your head. If the strap is a complete pain to adjust, or if the buckle doesn't stay in adjustment, move on.
Make sure they will fit with or without a helmet. Even if you don't use one now, you may in the future.
Some styles have softer, more rubbery buckles that won't dig into your scalp. Wider bands are more comfortable than narrower ones. And foam inserts keep out wind, ice and dirt. The foam should be thick enough to help cushion your face if you fall, but not so dense that it encourages fogging. The salesperson should be able to help you make this judgment.