Eye protection is crucial when hiking in the mountains and climbing at high altitudes. Sunglasses not only help improve visibility, but also protect against UV rays, wind, dust and the sun's glare on snow. Here's why they're essential and how to choose the right model.

Importance of Sunglasses in the Mountains

1. UV protection:
• Ultraviolet (UV) rays are much more intense at high altitudes because of the thinner atmosphere. Prolonged exposure without adequate protection can result in serious damage, such as cataracts or photokeratitis (snow blindness).

2. Glare reduction:
• Snow reflects up to 80% of UV rays, significantly increasing the risk of glare, which can make navigation dangerous and uncomfortable.

3. Protection against wind and debris:
• In the mountains, strong winds can stir up sand and small rock particles. Sunglasses protect the eyes from these elements as well as from the dryness caused by the wind.

Criteria for Choosing Sunglasses for Hiking and Mountaineering

1. UV protection:
• Choose glasses that offer 100% protection against UVA and UVB. This is non-negotiable for the safety of your eyes in the high mountains.

2. Protection categories:
• Glasses are classified from 0 to 4 according to their visible light filtering capacity. For high mountains, opt for categories 3 or 4, which offer adequate protection against intense light.

3. Coverage and adjustment:
• Goggles should provide full coverage and fit snugly against your face to block wind, snow, and UV rays. Models with side shields or a “mask” style are preferred.

4. Quality of the glasses:
• Polycarbonate lenses are impact resistant and lighter, making them ideal for mountain activities. Some lenses are also treated with anti-scratch and anti-fog coatings.

5. Comfort and durability:
• Make sure the glasses are comfortable to wear, especially when used with a helmet or hat. The temples and nose should be padded to avoid pressure points.

6. Color of the lenses:
• Grey or brown lenses are excellent for high mountain conditions as they minimise colour distortion. Polarised lenses are also beneficial for reducing glare on snow.

7. Polarization and photochromics:
• Polarized lenses reduce glare from reflections on snow and wet surfaces, which is crucial in high mountain environments.
• Photochromic lenses adapt to changes in light, which can be useful on extended climbs where light conditions vary.

In conclusion, choosing the right sunglasses is essential to ensure the safety and comfort of your eyes during hikes and climbs in the high mountains. Do not neglect this equipment and opt for quality models that meet the specific requirements of mountaineering.