While sunglasses can look cool, they serve a much more important function: protecting your eyes.
So, assuming you want to keep your eyes in tip-top condition, you're going to have to get yourself a good pair of sunglasses.
Unfortunately, not all sunglasses are created equal, and getting the wrong pair can actually do you more harm that good.
The first thing a good pair of sunglasses needs to be able to do is to make it dark enough to make for comfortable viewing.
The way sunglasses do this is they place light-absorbing particles either inside the glass imbedded in them, or on the surface. This blocks the sunlight from entering your eye. Some sunglasses have a tint factor of over 95%.
So, if you find you have sensitive eyes in the sun, go for a high tint factor.
Tinting can also add colour and style to your sunglasses. But if you choose amber or a brown lense, they block out blue light and can distort colour, so you might want to try grey or green lenses if that's an issue for you.
The reason is the tint placed on your sunglasses also causes your pupils to dilate and this allows more harmful ultraviolet light rays to enter the back of your eye and cause damage.
So, UV protection has nothing to do with lens colour or tint level. It has everything to do with blasting radiation that can damage your eyes. The best makes will block 100% of UV-A, UV-B and harmful blue light.