Ski Goggles and Sunglasses
These are your best protection against snow and cold. They really are essential when it's snowing heavily and some people find they need them in cold winds even when it's not snowing. They are also more secure than sunglasses - lots of skiers and boarders wear them all of the time, regardless of the conditions. Considering how quickly weather conditions can change in the mountains, it is worth keeping a pair on you at all times.
Double-lensed goggles should not mist up as readily as the single-lensed variety. You should also make sure that they are well ventilated. Anti-mist fluid can be applied to help control misting. However, the best advice for avoiding misted lenses is to keep the goggles in place, even when you are on a lift. Try to avoid lifting them off or placing them on your forehead - mist forms when there is a large difference/change in the temperature on the outside and inside of the lens.
Some of the top ski and snowboard goggles brands are: Anon, Bolle, Cebe, Dakine, Oakley, Sinner, Smith, Spy and UVEX.
Goggles from Snow and Rock
Whether the sun is out or not, a good pair of glasses is crucial. They will help protect your eyes from UV rays and the glare of the sun on the snow - which can cause snow blindness. Think about protecting the whole of your eye from potentially harmful rays - choose 'wrap-arounds' or glasses with protective side-panels.
You should check that the glasses are well suited to the contours of your face - there is nothing worse than the feeling of the frames gradually sliding down your nose as you are cruising/racing along. If you are a champion bumps skier, jump specialist or just extremely accident prone then it may be an idea in invest in a pair of glasses that attach themselves securely to your head - either by wrapping around your ears or with a band around the back of your head. You should never skimp on glasses - you only have one pair of eyes.
For more tips and advice on learning to ski: Ski boots | Skis | Snowboards | Ski wear | Extra gear | Ski fitness