Inexpensive but decent sunglasses?

[tulip]

Make sure that the sunglasses you buy have UVA and UVB protection. Otherwise, you could damage your eyes. The darkened lenses make your pupils open, and without UVA/UVB protection, you could suffer damage. Pupils naturally close in light for protection.

[OakLeaf]

Good point.

Polycarbonate lenses naturally block UV. Polarized glass lenses need to have a UV-blocking coating (and obviously glass lenses aren't the safest choice for sports). Polarized polycarbonate lenses tend to be expensive.

ETA:

From Eye Care Professional magazine:

Although the benefits of polarization are excellent for almost all patients and outdoor activities, some visual activities may be hampered by polarization. Pilots who operate aircraft with polycarbonate or tempered-glass windshields may be distracted by the stressed, checkerboard pattern that may appear in the material. Activities that may require use of a LCD screen may also be hampered by polarized lenses since LCD screens operate by polarizing light. An additional activity that may pose a danger to individuals wearing polarized lenses is downhill skiing. Glare for high speed skiers is a safety asset due to its ability to alert skiers to ice patches and bumps on a ski slope.

So in addition to the nausea-inducing properties I referenced, they could keep you from seeing your computer. I would think that the ability to see reflected glare from ice and water puddles would be an issue on the bici, too.

[Ja Da Dee]

Tifosi's with the automatic darkening

+1

My husband really likes these.

[n8chergirl]

they are really cheap and work great for me!! good luck!
Anna

[tzvia]

I've got several Tifosi, and bought a 4 lens Serfas (polarized, brown, clear and yelow) that I also like. Polarized lenses work best at a 90 deg angle to the glare source; staring into the direction of the sun you will be using the tint of the glasses but not the polarization. So I use the brown tinted ones or the polarized and they work fine until the sun is setting and I am looking in the sun's direction and shadows are long. Then I find they are too dark for all but the sun itself, which I am not going to try and stare down anyway. So I use the yellow tint which makes it easier to see in the shade on those evening rides (the sun may be bright, but what you are seeing in front of it is not and may be in shadow.) The yellow is also good on overcast days, to increase contrast.