Photochromic Lenses

A lens that follows the rhythm of the day: more visual continuity between sun, shade, clouds, and changing light conditions. Ideal for outdoor sports and for anyone who wants a single pair of glasses that is always ready.

Discover Cycling & MTB Models New DCHROM Cat.0–3 Go to the 3 Types

For all athletes, the constant search for materials and new technologies in clothing and accessories is essential to make practicing their favorite sport more enjoyable and to improve their performance.
Choosing a photochromic lens means choosing the highest level of technology currently available on the market when it comes to lenses.

Photochromic lenses are lenses that, when exposed to UV radiation or sunlight in general, trigger a reversible chemical reaction and darken. Once the light irradiation disappears, the lenses gradually return to their initial transparent state.

This “dynamic” behavior is what makes photochromic technology perfect for sports: the lens works while you move, helping you maintain readable vision without interruption, especially when the route alternates between bright stretches and shaded areas (forest, tunnels, changing weather).

photochromic lenses for cycling glasses — Mirrored photochromic lens, the highest level of technology and aesthetics.

Sports glasses with photochromic lenses — In cycling, the photochromic lens is the most technical and convenient option you can choose.

Why photochromic lenses are perfect for sports

Photochromic lenses can be used for every type of sport: outdoor and indoor. In indoor environments (for example: inside an inflatable structure for tennis), the lens protects the eye from artificial light and from possible obstacles that could impact the face, and in terms of vision it also supports prescription lenses when used with an optical insert. Outdoors, they prove to be dynamic lenses able to adapt by lightening and darkening with every change in light. The photochromic lens is recommended for practicing any sport because it allows the athlete to choose a single pair of glasses that can be used in every lighting and weather condition.

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Total protection A photochromic lens is even more effective when the glasses create a barrier against wind, dust, insects, and debris: this keeps vision stable and “clean” even at high intensity.
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Wide vision Coverage (large, wraparound lenses) helps protect the field of view and maintain consistent route reading, especially when light changes quickly.
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Ventilation Design and airflow help reduce condensation and fogging: on climbs or slower sections, moisture management really makes a difference in lens performance.
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Stability Nose pads and temple tips with grip improve hold with sweat and vibrations: fewer micro-movements = more visual continuity while the lens is working.

Photochromic focus: the goal is to avoid changing lenses and maintain continuity between bright and shaded stretches, so performance stays smooth and concentration is not interrupted.

All photochromic lenses in the DEMON line are made of premium first-quality shatter-resistant polycarbonate. There are some essential characteristics to consider when choosing your new glasses. In this article we will focus only on the features related to the lenses:

SHATTER-RESISTANT LENSES: When choosing lenses for your sports glasses, shatter resistance is a fundamental feature. Unexpected impacts or accidental collisions with obstacles during your favorite activity are often underestimated. Choosing an unbreakable polycarbonate lens offers maximum safety for your eyes. In fact, in the event of an accidental impact, the polycarbonate lens distributes the shock across its entire surface, preventing the creation of small fragments that could damage the eye, but instead forming a spiderweb effect that renders the lens unusable. It is no coincidence that polycarbonate remains the safest material on the market for manufacturing sports eyewear lenses.
DECENTERED AND OPTICALLY PERFECT LENSES: Decentering and an optically perfect lens allow the athlete to have perfect depth vision and accurate perception of reference points exactly where they are. In difficult passages or delicate movements, this feature can positively or negatively affect the success of the technical gesture. Using a lens that creates slight depth distortions or point distortion, in addition to causing a dizzy feeling, can reduce performance because of poorer vision.
LIGHTWEIGHT: The polycarbonate used to make photochromic lenses is not only highly impact resistant, but also the lightest material on the market. The best pair of glasses is the one you do not notice you are wearing, and that is why polycarbonate is used to create ultra-lightweight glasses.

In practical terms: safety (impact resistance), optical quality (correct perception of distances and reference points), and comfort (low weight) are the foundation for getting the best out of photochromic technology, because they allow you to wear the glasses for a long time without tiring the eyes or interrupting the action.

The 3 types of DEMON Photochromic Lenses

The DEMON range includes 3 types of photochromic lenses. The main factors that differentiate them are the base tint and the protection category they can reach:

» SMOKE PHOTOCHROMIC LENS: starts from Category 0 and darkens up to Category 2. The lens appears completely transparent at the starting point and can be used indoors as simple protection from artificial light reflections, and for prescription glasses with an optical insert it provides protection for the prescription lens.
Outdoor sports: it is especially recommended for running and mountain biking, because it can be used not only for night rides but also early in the morning and late in the afternoon. The lens transition allows constant adaptation in low-light areas such as dense woods, tunnels, and shaded sections of the route.

If you need a lens that stays very “clear” when light drops (dawn, evening rides, indoor use, long shaded stretches), this is the most practical logic: maximum versatility and continuous transitions without changing glasses.

Smoke photochromic lens category 0-2 — “Cat.0-2” range: ideal transition for variable conditions and low light.

» DCHROM: starts from Category 1 and darkens up to Category 3. The lens starts with a light smoke tint and can be used for every outdoor sport.
Compared to the smoke photochromic lens, the DCHROM lens is not suitable for night rides because the light tint may appear dark in weak artificial lighting.

DCHROM is designed for true outdoor use: when the session is long and light remains intense for hours, the lens aims to maintain comfort and visual relaxation, working progressively up to Category 3.

Mirrored DCHROM photochromic lens category 1-3 — DCHROM: lightly tinted starting color, up to Category 3.

New DCHROM photochromic lenses category 0–3

The new DCHROM Cat.0–3 lenses further expand the versatility of photochromic technology: this version starts completely transparent (Category 0) and, as UV exposure and sunlight increase, reaches up to Category 3 at maximum performance.

Why is this a real advantage? When you start your ride in very low light (dawn, strongly shaded sections, very dense woods), you want a lens that lets as much light through as possible; when you then find yourself in full sun, you want protection and long-lasting comfort. In practice: from transparent to Category 3, for dynamic management of the day and the route.

See DCHROM Cat.0–3 Models How to choose

How do you choose between Cat.0–3 and Cat.1–3? If you want maximum versatility even when light is very low, the Cat.0–3 logic is designed to start completely transparent. If instead your priority is a lens designed for prolonged outdoor use with an already “sporty” base tint, Cat.1–3 remains a benchmark for comfort and protection.

» SMOKE 2-4: starts from Category 2 and reaches Category 4 at maximum performance. It is important to consider that Category 4 is generally reached in high mountain areas with very strong sunlight and very intense UV radiation.
This particular photochromic lens is created for mountaineering and hiking, but it can also be used as a normal lens at lower altitudes by people who are particularly sensitive to light, because in very strong sunlight it is able to exceed the standard darkness of sunglasses.

This is the “high-altitude” choice: when brightness and UV become very intense, you need a wider range to maintain comfort and protection.

Photochromic lenses 2-4 for high mountains — Cat.2–4 range: designed for very intense light conditions.

Quick selection guide

If you want an immediate overview, here is a quick summary (without replacing the full explanations above). The best choice mainly depends on: the most frequent average light, the need to start very clear, and the duration of your outdoor session.

Type	Working range	When to choose it
SMOKE PHOTOCHROMIC LENS	Category 1 → category 2.5	Maximum versatility even in low light (indoor / dawn / evening returns / deep shade) and frequent changes.
DCHROM (incl. new Cat.0–3)	Cat.1 → Cat.3 New: Cat.0 → Cat.3	Prolonged outdoor use with comfort and “visual relaxation.” Cat.0–3 if you want to start fully transparent when light is very low.
SMOKE 2-4	Category 2 → Category 4	High mountains and very intense light/UV conditions, when you need to go beyond the standard darkness of sunglasses.

Go to Cycling & MTB Photochromic Models Back to top

FAQ about photochromic lenses

Quick answers to the most common questions: what to expect in real use, between changing light, heat, and special situations.

Do photochromic lenses always react the same way?

Photochromic technology is a reversible chemical reaction: the lens darkens as UV and sunlight increase and gradually returns to transparency when irradiation decreases. In “extreme” conditions (very hot or very cold), it is normal to notice small variations in speed or intensity.

Can photochromic lenses darken less in hot weather?

Yes, on particularly hot days the lens may darken slightly less or respond differently: this is normal behavior linked to how temperature and photochromism interact during the reaction.

Can they darken fully inside a car?

Darkening depends heavily on UV: with a windshield that filters part of the rays, the photochromic effect may be less noticeable. In a sports context, this is more relevant for those who often switch from outdoor use to driving during a session.

What is the main difference between DCHROM Cat.0–3 and DCHROM Cat.1–3?

Cat.0–3 starts completely transparent to handle very low light as effectively as possible and reaches up to Cat.3 at maximum; Cat.1–3 starts with a lightly tinted base and reaches Cat.3 at maximum performance, with a “sport” setup dedicated to prolonged outdoor use.

What details make a photochromic lens truly effective in sports?

In addition to the darkness range, coverage (wide field of view), stability (grip with sweat and vibrations), and ventilation (reduced condensation/fogging) also matter. When these aspects work together, photochromic technology becomes a real advantage.

Which lens should I choose if I often alternate between sun and shade in woods and tunnels?

If you face frequent changes and often low light, the clearest starting logic is the most comfortable. If instead you do prolonged outdoor activity in intense sun, DCHROM focuses on comfort and protection up to Cat.3, with the new Cat.0–3 option for those who want to start fully transparent.