Sunglass Lens Colours: What Do Grey, Brown, Green and Gradient Lenses Do?

Sunglass lens colours are not just a matter of looks: each colour affects the colours and contrast you see in a different way. Grey leaves colours as they are, brown increases contrast, green sits between the two, and a gradient lens reduces in darkness from top to bottom. The right colour is chosen according to where you will wear the glasses most.

What do sunglass lens colours change?

Lens colour changes the tone of the light reaching the eye, that is, how natural colours look and how clearly details stand out. A sunglass lens has three separate properties that are often confused:

1. Colour (tint): determines whether the image looks warm or neutral, and the contrast.
2. Darkness: shows how much visible light gets through and is expressed as a filter category numbered from 0 to 4.
3. UV filter: determines how much ultraviolet light is blocked; it is independent of colour and darkness.

Two lenses of the same colour can differ in darkness. A light brown lens suits cloudy weather, a dark brown lens suits the beach. Category 0 means a very light lens and category 4 a very dark one; the most common category, used for strong sun and the beach, is 3. To choose the darkness, see the table in our article on sunglass filter categories.

What does each lens colour do?

Grey reduces light without changing colours, brown and amber increase contrast, green strikes a balance between the two, and yellow gives contrast only in low light. The table below shows the most common lens colours side by side.

Grey lenses

A grey lens is a neutral lens that reduces light without changing colours. The sea looks blue, trees look green and traffic lights keep their colours; everything is simply less bright. It is a balanced choice for people who want colours to stay natural and who wear their glasses all day in every setting.

Brown and amber lenses

Brown and amber lenses are warm-toned lenses that increase contrast. The edges of objects and details on the ground stand out more clearly. That is why they are preferred where the light changes often, for example on days when clouds come and go, on tree-lined roads and when driving. In return, the image shifts slightly towards a warm tone.

Green lenses

A green lens strikes a balance between contrast and natural colour. The classic green shade known as G-15 is a common example of this group. It shows colours almost as naturally as grey while adding a little contrast to the image; it suits people who choose for general use rather than for one particular setting.

Yellow lenses

A yellow lens is a light-toned lens that gives contrast in low light, and it is not suitable for strong sun. It brings out details in overcast weather, but because it blocks very little light, it is not enough on the beach or in the midday sun. There is no scientific evidence that the yellow lenses sold for night driving improve vision.

Rose, copper and fashion tints

Rose and copper lenses increase contrast, so they are used in sports such as golf where you need to pick out the ball and the slope of the ground. Fashion tints such as blue, purple or light pink are mostly chosen for their looks. With these lenses, darkness matters more than colour: a very light lens is not enough in strong sun, so check the category number, which on most glasses is printed on the inside of the temple.

What is a gradient lens?

A gradient lens is a sunglass lens that is dark at the top and light at the bottom, with the colour fading gradually from top to bottom. The top part reduces the light coming from the sky, while the lower part lets through more light when you look down or at things close by. This design is useful when driving: you look at the road through the dark part and at the dashboard through the light part.

The limit of a gradient lens is settings where light comes from below. The sea and the sand reflect light upwards, and the light lower part of the lens does not reduce this reflection as much as the upper part. For long days on the beach, a lens of even darkness throughout is more suitable. A gradient can come in grey, brown or another colour; in other words, it is not a colour but a distribution of darkness.

What does a mirrored lens do?

A mirrored lens reflects part of the light reaching it thanks to a reflective coating on its front surface. This coating is applied over the base lens and reduces the light reaching the eye a little further, which is why it is preferred in very bright settings such as the seaside.

A mirrored lens has two separate colours: the mirror colour you see from the outside and the base colour you see when looking through it. A blue mirrored lens can have a grey or brown base. It is the base colour that shapes your vision, so when choosing mirrored glasses, look through the lens and check the tone of the image. A mirror coating can make fingerprints and scratches more visible; carrying the glasses in their case is a good habit.

Does lens colour show UV protection?

No, neither the colour nor the darkness of a lens determines UV protection. The UV filter comes from the lens material or its coating and can even be colourless; a clear lens can carry UV400 protection, while a very dark lens may not.

The UV400 label means the lens does not let through ultraviolet light up to 400 nm. It is explained in detail in our article what does UV400 mean. Polarisation is also separate from colour: a grey, brown or green lens may or may not be polarised. You can find out how a polarised lens filters glare reflected off water and wet roads in our article what are polarised sunglasses.

How do you choose a lens colour for how you will use it?

Lens colour is chosen to suit the light where you will wear the glasses most: dark grey or brown lenses stand out by the sea, grey, brown and gradient lenses for driving, grey and green in town, and contrast-enhancing shades for sport.

Sea and beach

By the sea, a grey or brown category 3 lens of even darkness throughout is suitable. On the Antalya coast the summer sun is strong, and on the beaches of Belek and Kadriye the sea and the sand reflect light as well. If glare on the water surface bothers you, consider a polarised lens, and on very bright days a mirror coating.

Driving

Grey, brown and gradient lenses are preferred for driving. Categories 2 and 3 are used for daytime driving; category 4 lenses are not suitable for driving. If you plan to drive in fashion tints that change colours noticeably, make sure you can easily tell traffic lights and brake lights apart. Details such as polarised lenses making some dashboard displays look faded are covered in our article on sunglasses for driving.

Town and everyday use

In town, grey, green and gradient lenses are comfortable. Because you move between shade and sun often during the day, a medium-dark lens is more practical than a very dark one. Fashion tints chosen for their looks also find their place mostly in this kind of use.

Sport and outdoors

For sport, contrast-enhancing brown, amber, copper and rose shades stand out. These shades make it easier to pick out the ball and the slope of the ground; golf is the typical example. In active sports, how well the frame fits the face and stays in place matters as much as the lens colour.

Choosing step by step

You can follow this order when choosing a lens colour:

1. Check the protection first: the label should show UV400 and the CE mark.
2. Choose the filter category for the brightness of your surroundings.
3. Decide whether you want to see colours naturally or increase contrast; grey suits the first, brown or amber the second, and green sits in between.
4. If reflections from water, wet roads or the bonnet bother you, consider a polarised option.
5. If possible, try the glasses in daylight; the same colour can look different at different levels of darkness.