Protecting Your Eyes on the Mountain

When preparing our gear for a day in the mountains, we often think of thermal jackets, gloves, and appropriate boots. However, there's an accessory often underestimated, posing a significant health risk: sunglasses.

Eye protection in the mountains is not merely an aesthetic complement, but crucial defense against ultraviolet (UV) radiation—an invisible yet highly damaging spectrum that intensifies with altitude and multiplies with snow reflection.

Conditions like solar keratitis or "snow blindness" can emerge after just a few hours of direct exposure.

Snow and Sun: A Dangerous Combination

Few realize that snow reflects up to 80% of UV radiation, amplifying its effect on skin and, particularly, on the eyes. And at higher altitudes, the intensity is greater. Unlike visible light, UV radiation isn't perceived, but its effects can be powerfully felt.

Brief but intense exposure can cause what is known as solar keratitis or "snow blindness": acute corneal inflammation caused by excessive radiation. Symptoms—eye pain, photophobia, tearing, redness, and temporary loss of visual acuity—typically appear between 4 and 6 hours after exposure. Though recovery usually occurs within a few days.

Just two hours without adequate eye protection in high mountains can be enough to trigger this condition.

The Risk Isn't Just Immediate

Sun exposure on snow isn't just about short-term effects. UV radiation damage is cumulative, and numerous scientific studies link it to the premature development of cataracts and to diseases like age-related macular degeneration (AMD), a leading cause of vision loss in older individuals.

Eyelids and periorbital skin are also exposed, and their protection is key to preventing premature aging and the appearance of skin carcinomas, especially in areas of intense radiation.

In the case of children and adolescents, extra caution is essential. Their lens has not yet fully developed the natural filter that helps block UV rays, making them especially vulnerable.

Which Glasses Are Suitable?

Not all sunglasses are suitable for skiing. For effective eye protection in snow, it's important to choose glasses that comply with European regulations and feature a UV filter of category 4, the highest on the solar protection scale. These lenses reduce the amount of visible light and effectively block UV rays.

It's also recommended that glasses fully cover the eye socket, prevent lateral light entry, and be made of impact-resistant materials.

Can Snow Blind You?

The name "snow blindness" may seem alarming, but it's important to clarify: it does not involve permanent vision loss. It is a temporary condition. With rest and protection, full recovery usually takes a couple of days.