Lenses
Sunglass lens colour guide: what grey, brown, blue, ice blue and red each do to the light
A sunglass lens colour is a decision about which part of the light to remove. Grey removes all colours evenly, so what you see is dimmer but true. Brown removes more blue than red, which cuts haze and raises contrast at the cost of a warm shift. Mirror coatings reflect a slice of light before it enters the lens, and their colour is what other people see, not what you see through them. Below is what each of the five common tints does, the light it suits, and the one it does not.
How a tint works
White light is every colour at once. A tint is a dye that absorbs some of those colours more than others. The colour the lens appears to be is the part it does not absorb, the part that reaches your eye.
That means a lens colour is best understood by what it takes away:
- A grey lens takes away a little of everything, evenly.
- A brown or amber lens takes away more blue than red.
- A blue lens takes away more red and yellow than blue.
- A yellow lens takes away most of the blue.
Two other things are separate from tint and often confused with it. Darkness is how much light is removed in total; two grey lenses can differ enormously. Polarization is a film that removes glare; any colour can be polarized or not. Our UV400 vs polarized post separates the labels.
Grey: the neutral
Grey attenuates the whole visible spectrum together. Colour relationships survive intact, which is why it is the default for anything where you need to judge a colour: driving, and anything with signals, flags or markers.
- Best in: flat bright sun, driving, everyday.
- Does not: lift contrast. On a hazy day, grey dims the haze too.
- Pair: T01 Grey.
If you only own one pair, own a grey.
Brown: the contrast lens
Blue light scatters more than longer wavelengths do, in the atmosphere and inside the eye. That scatter is haze: the veil that flattens a landscape into one plane. A brown lens absorbs more blue than a grey one, so it removes some of the haze along with it. Near separates from far, edges sharpen, and the whole scene reads with more depth.
The cost is a warm shift. Everything looks slightly amber. Most people stop noticing in minutes; some never like it.
- Best in: variable light, hiking, low sun, judging distance, ball sports.
- Does not: keep colours true.
- Pair: T01 Brown.
Mirrors: a coating, not a tint
A mirror is a thin reflective layer on the front face of the lens. Some incoming light bounces off it before entering the lens at all, so a mirrored lens can reduce light without the tint underneath needing to be heavier.
Two things follow from that, and both are often misunderstood:
- The mirror's colour is the outside view. An ice-blue mirror looks ice blue to someone facing you. What you see through it is the base tint underneath, which is usually grey or brown and is not stated on most listings, including the one we buy against.
- A mirror does not polarize. Polarization is a separate film. A mirror can sit on a polarized or a non-polarized lens.
Mirrors earn their keep where light arrives twice: once from the sky and again bounced off a surface.
Dark blue mirror
A deep blue coating over a dark base. Reads as the most serious of the three from the outside.
- Best in: open water, midday sun, boating, fishing.
- Pair: T01 Dark Blue.
Ice blue mirror
The palest and most reflective coating. The brightest-looking lens from the outside.
- Best in: water, snow, high glare.
- Pair: T01 Ice Blue.
Red mirror
A red-orange coating. Under a red mirror the base is usually a warm tint, which separates greens and reds more than grey does; that is the pattern that helps under trees and over grass.
- Best in: patchy light, cycling, ball sports.
- Pair: T01 Red.
The five, side by side
| Tint | What it removes | View through it | Best in | Avoid for |
|---|---|---|---|---|
| Grey | Everything, evenly | True colours, dimmer | Bright flat sun, driving | Hazy days where you want contrast |
| Brown | More blue than red | Warm, higher contrast | Low sun, hiking, distance | Colour-critical tasks |
| Dark blue mirror | Reflects a slice; base tint underneath | Base tint, base not stated | Open water, midday | Driving |
| Ice blue mirror | Reflects the most; base underneath | Base tint | Water, snow, glare | Driving, overcast |
| Red mirror | Reflects; warm base underneath | Warm, green/red separation | Patchy light, sports | Colour-critical tasks |
Which to buy
Match the tint to the light you spend most time in, not to the colour on the shelf. For most people that is grey. If your hours are on trails or at the ends of the day, brown. If they are on water or snow, one of the mirrors, and which one is mostly a matter of how reflective you want to look from the outside.
The home page demo shows the same scene through all five, and the lens pages go deeper on each.
Frequently asked questions
What is the best sunglass lens colour?
There is no best colour, only a best match to the light. Grey for bright flat sun and true colour. Brown for contrast and low sun. Mirrors for water and snow. If you must pick one for everything, grey.
Grey vs brown sunglasses: which is better?
Grey keeps colours true and dims evenly; brown lifts contrast and cuts haze but warms the view. Grey for driving in bright sun and colour-critical use; brown for hiking, low sun and long days.
What colour lens is best for fishing?
A mirror over a dark base, polarized, for open water in bright sun. A brown, polarized, for rivers and flats where you are reading the bottom. Our fishing post covers both.
Do mirrored sunglasses block more light?
Yes, a little. The mirror reflects part of the light before it enters, so a mirrored lens on the same base is slightly darker than the unmirrored one. How much depends on the coating, which is a figure most makers do not publish.
Is a blue lens bad for your eyes?
Not in itself. UV protection comes from the lens material and coating, not the tint. A blue tint is a poor choice for driving because it shifts the colours of signals, but it does not harm the eye.
Sources
- American Academy of Ophthalmology. Sunglasses: tinted lenses and what each colour does. www.aao.org
- Hecht E. Optics, 5th ed. Pearson, 2017. Chapter 4, absorption; Chapter 8, Rayleigh scattering and why blue scatters most. www.pearson.com
Measurements on this site are the frame maker's published figures, attributed on every page that prints one. This is general information about sunglasses, not medical advice.
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