Category 3 sunglasses: what it means, when to choose it and 8 frames with dark lenses
Category 3 is the standard dark lens of sunglasses: it lets through 8–18% of light, suits full sun and daytime driving. What changes with category 2 and 4, the link with colour, UV and polarization, how to read the label, and eight pairs of sunglasses with solid dark lenses chosen by OCCHIO!.
Category 3 is not a grade. It is a measurement.
On the label of almost every pair of sunglasses there is a number from 0 to 4: the filter category, i.e. how much light the lens lets through. Category 3 is the one most sunglasses come in, and it is also the one that raises the most questions: is it fine for driving? Does it protect against UV? Is it too dark for the city? Here are the answers, and eight pairs of sunglasses with solid dark lenses chosen from the OCCHIO! selection.
the visible light a category 3 lens lets through: the rest it stops
to daytime driving with category 3; no with category 4, never at night with sun lenses
the value to look for besides the category: it says the ultraviolet protection, which is a different thing
What category 3 means
The European standard for sunglasses (EN ISO 12312-1) divides lenses into five filter categories according to visible light transmission. Category 3 lets through between 8 and 18% of light: a dark lens, designed for full sun. It says nothing about colour, optical quality or UV protection: it only says how much it darkens. It is the category of most sunglasses on the market, the ones bought for summer and worn from May to September.
The five categories
| Category | Light transmitted | When | Driving |
|---|---|---|---|
| 0 | 80–100% | Clear or near-clear lenses, fashion, indoors | Yes |
| 1 | 43–80% | Overcast sky, low light | Yes |
| 2 | 18–43% | City, medium light, spring and autumn | Yes |
| 3 | 8–18% | Full sun, beach, summer, mountains | Yes, in daylight |
| 4 | 3–8% | High mountains, glaciers, extreme light | No |
Filter categories according to EN ISO 12312-1, the standard behind the CE marking of sunglasses sold in Europe. The category is printed on the label and often engraved on the lens or inside the temple.
Category 3 or category 2
This is the real choice. Category 3 is for anyone who wears sunglasses in full sun: sea, beach, boat, mountains in summer, the car on bright days. Category 2 lets through twice as much light and suits the city, spring and autumn, changeable days, and anyone who struggles to readjust when stepping out of shade. A practical sign: if, under an arcade, you find yourself pushing your sunglasses up onto your forehead, that is a category 3 used where a 2 was needed. Many people end up with one of each.
Category 3 and driving
Yes, you can drive with category 3, and it is in fact the most used category at the wheel in daylight: it removes enough light to avoid dazzle without compromising the reading of traffic lights and signs. The limit is category 4, which lets through less than 8% of light and is by law not suitable for driving; category 4 lenses carry a symbol with a crossed-out car. And at night, at dusk or in tunnels you do not drive with any sun lens, whatever the category.
Lens colour
To reach 8–18% a lens has to be dark, and three colours get there without distorting what you see. Grey is neutral: colours stay as they are, the safest choice for driving. Green keeps colours true and adds a little contrast: the historic colour of aviator lenses. Brown warms and raises contrast: the most comfortable under overcast skies and in autumn. Light yellow, orange and pink stay in category 1 or 2 and have other uses. The collections by colour: grey lenses, green lenses, brown lenses.
Category 3, UV and polarization
Three different things that often get confused. The category says how much the lens darkens. UV protection says how much ultraviolet radiation it stops, and reads as “UV 100%” or “UV400”: a light lens can have it in full, a dark one may not. Polarization is a filter that removes glare from water and roads; polarized sun lenses are almost always category 3, but not every category 3 lens is polarized. Polarization has a guide of its own: polarized lenses, when you need them.
How to read the label
Every pair of sunglasses sold in Europe carries a CE marking and an information leaflet with the filter category. The category is often engraved on the lens too, in small print, or printed inside the temple. If you cannot find it, ask your optician: on OCCHIO product pages we state it when the maker declares it, and in the boutique we read it with you on the label and the engraving, on any sunglasses, even ones not bought from us.
Eight pairs of sunglasses with solid dark lenses
Even grey, green or brown: the colours and density typical of category 3. The exact category is in each model's information leaflet.
Lesca Lunetier Ogre XL Ecaille / Green
Solid green is the colour that keeps colours truest when the lens is dark; on a frame as large as the Ogre it shields the sides too. Lesca's best-selling sunglasses.
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Cubitts Cruikshank Black L
Even grey on a black acetate round: the most neutral combination possible, colours stay exactly as they are. Cubitts makes the same model in several sizes: this is the L.
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Peter and May Amy Black
Everyday sunglasses, black on black, with a grey lens that does not alter colour perception: the simplest choice for the city in summer.
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Eyevan Thompson MBK-BK
Matte black Sabae titanium and an even dark lens: twenty grams, full protection, no colour cast. For anyone who wants a dark lens on a frame that weighs nothing.
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VAVA WL0067 Black Matte
Sharp geometry, matte black, grey lens: VAVA builds sunglasses as a design object, and the dark lens is part of it. Compact 39 mm lens.
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Eyevan 7285 1096 902805
Eyevan 7285's small titanium round with a dark grey lens: the lens does all the work, the frame almost disappears. 44 mm lens.
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KameManNen KMN 1232 SG
One of Japan's oldest eyewear houses in a sun version: thin titanium, tortoiseshell details and a dark grey lens. Sunglasses for people who usually only wear their glasses.
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T HENRI Somnia Lucid
A dark green lens on one of T HENRI's micro-productions: 199 pieces per colour, numbered. Green, like grey, does not alter colours; here it also has the depth of old glass.
View the frameIf the lens also needs your prescription
Any sun frame in the selection can take category 3 prescription lenses, in grey, green or brown, single-vision or progressive: the guide to prescription sunglasses explains how to order them from Italy. To choose the shape: the best sunglasses 2026 and which frame for your face shape.
What does category 3 sunglasses mean?
That the lens lets through between 8 and 18% of visible light: it is the third of the five filter categories (0 to 4) defined by the European sunglasses standard. In practice it is the standard dark lens for full sun, the beach and summer, and it is fine for daytime driving.
Category 3 or category 2: which should I choose?
Category 3 if you wear your sunglasses in full sun, at the beach, in the mountains in summer, in the car on bright days. Category 2 if you mostly wear them in the city, in changeable light, or if your eyes adapt slowly to shade. Many people end up with one of each.
Can you drive with category 3 lenses?
Yes, in daylight: category 3 is the most used category for driving, because it removes enough light without compromising the reading of traffic lights. You do not drive with category 4, and at night you do not drive with any sun lens.
Does category 3 protect against UV?
Not necessarily. The category says how dark the lens is; UV protection is a separate value: look for “UV 100%” or “UV400” on the label. On OCCHIO product pages UV protection is stated when the maker declares it.
What colour is a category 3 lens?
Usually solid grey, green or brown, because to reach 8–18% transmission the lens has to be dark. Grey keeps colours neutral, green keeps them true with a little more contrast, brown warms and raises contrast. A gradient lens can be category 3 at the top and lower at the bottom.
Are polarized lenses category 3?
Almost always: the polarizing filter already removes a lot of light, and polarized sun lenses normally come in category 3. There are, however, lighter category 2 polarized lenses for the city.
Can I have category 3 prescription lenses?
Yes: on any sun frame in the selection, single-vision or progressive, in grey, green or brown. Progressives need measurements taken at the boutique in Crema, with the frame on.
The category is read, the lens is tried
In the boutique in Crema we let you compare a category 2 and a 3 on the same face, in real daylight outside the door. Online, write to us on WhatsApp with the model you like: we tell you category, colour and whether it can take your prescription. Worldwide shipping from Italy.