ALL YOU NEED TO KNOW ABOUT PHOTOCHROMIC SUNGLASSES

WHAT IS A PHOTOCHROMIC LENS?

A photochromic lens is a smart lens that reacts to UV rays from the sun: the more UV exposure, the darker the lens becomes—and vice versa. In other words, this type of lens changes tint according to the intensity of light. The goal is to improve visual comfort as lighting conditions fluctuate.

> You can also read: Photochromic ski goggles, what are the benefits?

HOW DO PHOTOCHROMIC SUNGLASSES WORK?

Photochromic sunglasses contain molecules—such as chloride, silver halide, and/or oxazine—embedded in or on the lens surface. When these molecules are exposed to UV light, a chemical reaction occurs: the molecular bonds break, allowing them to move freely and absorb light, causing the lens to darken. Once UV exposure decreases, the bonds reform, and the lenses become clear again.

WHAT ARE THE ADVANTAGES OF PHOTOCHROMIC SUNGLASSES?

Photochromic sunglasses are efficient, practical, and cost-effective. Key benefits include:

• High protection, filtering all UV rays and reducing glare from intense brightness—ensuring better safety on every outing ;
• Smart investment, offering a 2-in-1 solution for both low-light and high-light conditions, which means you don’t need a second pair of sunglasses;
• Versatility, as they can be used for a variety of outdoor sports (trail running, hiking, cycling, etc.);
• Convenience, as the lenses shift quickly from dark to light, providing continuous visual comfort.

Good to know:
Photochromic sunglasses are not ideal for driving, as most windshields are designed to block UV rays. This can prevent the lenses from darkening, even in bright sunlight.

> You can also read : Cycling sunglasses – how to choose the right pair?

WHY USE PHOTOCHROMIC SUNGLASSES?

Photochromic sunglasses are particularly suited to sports where light conditions change frequently, such as wooded trails, open fields, or mountainous terrain. For example, during a trail run, you may pass through dense forest with low sunlight—where the lenses lighten—before emerging into sunny, exposed plains—where the lenses darken to protect your eyes from UV rays and glare. The same applies to mountain biking, running, or road cycling.

> You can also read:Which sunglasses for which sport?

CHOOSE PHANTOM, BOLLÉ'S PHOTOCHROMIC TECHNOLOGY

At Bollé, we support your performance with Phantom, our cutting-edge photochromic lens technology. Phantom lenses are made from NXT®—one of the lightest lens materials, even lighter than polycarbonate. Beyond their light weight and comfort, Phantom photochromic lenses stand out thanks to:

• 100% UV protection;
• Outstanding optical clarity and sharp definition;
• Excellent impact resistance;
• High performance, with a tint range from Category 0 to 3 in under 30 seconds, adapting to any weather—even extreme conditions (from -10°C to 20°C);
• High contrast, thanks to a contrast-enhancing filter on our summer sunglasses range that boosts colors and optimizes vision;
• Prescription-ready for 99% of visual needs, because every eyesight is unique;
• Enhanced durability, with photochromic technology built into the lens material—not just surface-coated;
• Wide light coverage, as Phantom lenses adapt from Category 0 to 3.

Discover our full range of photochromic sunglasses