The first rider to wear bike sunglasses was the Australian, Phil Andersen, he started Oakley on their road to success, and there is also Briko and Rudy Project, which are the main sunglasses for cyclists.
Adidas, Specialized, Bolle, Cat-Like also make nice glasses but probably the main one has to be… Oakley 
The first bike sunglasses were big and had coloured frames, very unsubtle, over the years they have become more comfortable and stylish enough to wear off the bike.
The lenses on specific bike sunglasses can be changed for different conditions, clear for dark, yellow to enhance the visibility in dull light and for bright sunlight there is many choices, reflective in all different colours and very dark lenses so no one will be able to see when you are suffering on a long climb. 
The
shape of the frame is also very important as they have to be comfortable and fit your face, of course you also don’t want to end up with a face like a panda bear, with big white eyes, so get a pair that isn’t going to cover all your face.
Adjustable legs and nose pieces will help to make your glasses comfortable and less likely to fall off when your cycling.
Sunglasses for cycling are very practical as well as stylish, they can keep dust and flies out of your eyes when you are cycling and if you need prescription lenses they can be added to your favourite frames, so you can look cool and see where you are going at the same time.
Hi, Sam!BBB offers nice value glasses. I have a pair of Challenge for 4 years, everything is sweet, except the logos and rubberised end parts of the frame that had fallen off when using.
I have the polycarbon prescription glasses (both in polar ray and transitional)Had I not had the polar ray on the day I went down, I’d be cycling with one eye today.The lens took a direct hit from a metal shard as well as gravel. While substantial surgery was neede for the eyebrow and a torn lower eyelid as well as cheek lip and chin, the eye suffered NO damage.My Poly Carbonate glasses are like my helmet. I don’t get on the bike with out em.
Hi Sam, what a coincidence! I wear a pair of “Custa Del Mar” sunglasses from Japan. I crashed 2 weeks ago while riding and did a face-pant and scraped along on the right side of my face. The sunglasses held together and left scrape marks on the right lens and on the highway. The polycarbonate lens held and protected my right eye! The Sportique eye glass store in Boulder, Co. said that the lens was even stronger because they were polaroid. I never thought I would be praising the strength of sunglass frames and lenses. Let me tell you…
Hi Sam,Thanks for the interesting article on sunglasses. Here in good old South Africa we share the same “problem” as our Aussie cycling friends: Too much sunshine! Although our weather in summer is perfect for riding, wearing shades that make extra provision for the “bad UV rays” is not an option but a necessity. I have two pairs of “BBB’s” that give me perfect service. Any comments on them? Kind regards,Simon (in sunny South Africa)!
I can second the praises of Costa Del Mar sunglasses, I lost my pair of “Zooms” years ago and they were the greatest. As I suspect of many riders, I cannot get Rx lenses to work, tried Tifosis, the adapter was so fragile the optometrist broke two before fitting, and we could not get Rx right for my needs. I have to wear shades OVER my regular glasses. They no longer make the wraparounds that I loved. I must make do with drugstore Solar Shades.