Cycling Gear: Cycling Sunglasses?

If you have a Harbor Freight near you they have one piece safety glasses between 1.99 and 3.99. I use a yellow pair, but they also have dark ones. They have nylon temples and slide off a little too easily, so I drilled holes and added an elastic cord to mine (I use them for sailing too).

Because they're one piece glasses they have no frame, which is nice when you're bent over on your bike and looking through the top of the lens (I noticed the frame getting in the way on my last pair of shades). 

do a Google search for Smith & Wesson Magnum 3G and mini Magnum 3G perfomance safety glasses. Places like TASCO sell the entire line. The mini Magnum is a smaller frame for boys and women. The mini does not have an orange tint.

In order of darkness:

welding #5

welding #3

gold mirror grey

grey

copper

orange

yellow

clear

I've used several types, but they all are some kind of "sport" glasses or other somewhat wrap-around shape.  I use clear ones at night (Ryder's eyewear Tarmacs, which are okay, and say a whole year of use before getting any scratches, including daily commutes) and somewhat darker ones during the day.  i have an old pair of Oakleys, the old m frame types, which are cool. Also Optic Nerve another glasses company, I have one of their yellow lenses, nice glasses.  Uvex is another one -- I found 2 pair on the roadside (literally). They are fine for riding and and appear to be some kind of safety sunglasses.

 Any of these brands or many more -- Smith, Native, Rudy -- would do you well. I'd avoid swapping lenses repeatedly; better to get two pair, one light and dark, and wear diff glasses. To cut the cost obviously figure out when you ride more, light or dark, as a rule (there will be exceptions) and splurge on those.  Or split the diff and get yellow or orange lenses which can be used in low light and still have some tint to cut glare; in darkness you'll have the added bonus of not getting blinded by those new blue car headlights from the other side fo the street. Or, get those lenses that change color. Virtually every company makes them now. I was using a pair of orange shades as my regular sicne even when it got sorta dark I coudl still use them. Left them at the tour of Somerville bike race in NJ like a moron, so it's back to using clear on rainy days and nights, and darker ones in sun, unless I wanna break out the optic nerve shades. 

You can go as cheap as you like but be warned; quality stuff will last longer than cheepcheep.  Don't mean you have to get the MOST expensive pair, a 49$ pair of Ryders Eyewear or $69 pair of Optic Nerve shades may work as well as a 149$ pair of the newest Oakleys for the average rider, as the performance difference between the more expensive and less may not show up until you reach a certain level of riding. If you are going to be in the saddle for six or seven hours frequently, bite the bullet and buy the expensive shades, for the same reason you'd buy a 199$ helmet over a 39$ helmet -- the advantages will likely be in comfort that you only see over the longer hauls.

I'd say, look around for deals, old models at bike shops (altho keep in mind the possibility of replacement parts especially for high-end models where that's part fo the features and selling points), bike nashbar, etc. Check sporting good stores or hardwear stores. But get something that's designed for active use.  You're buying equipment not fashion crap. I've never had a pair of sports or other such glasses break, even the cheap ones, including a pair of Oakley knock offs!  But I have had several pairs of glasses purchased from convenience stores self destruct, some after only being used a few times. Frames cracked and lenses pop out, typically.

Look for deals, but get what you pay for.