I am seeking eye protection for cycling. I don't know if I should buy glasses or goggles.
Glasses are suitable for most all cycling purposes. Goggles are more specific, like for some mountain biking and perhaps in snow. Even so, I see cyclists in glasses far more often than goggles.
In terms of glasses.
For the frames: Most manufacturers have road and mountain models at various price points. Get a frame that fits your face well. If googles, ones that fit your face and vented.
For the lenses (glasses or goggles), which are key, there are a few things to look for.
FWIW - Last weekend at a very muddy cyclocross race I watched, no one was in goggles.
A frame that doesn't obscure your vision at all. Especially if you're cycling on the road, you want to be able to do a shoulder check without the frame blinkering you at all.
Also, glasses that fit quite close to your face are good because they reduce the chance that a bit of mud or an insect is going to get around them and into your eye.
Do not reinvent the wheel!
Most replies just list things -- they don't tell you how you can get them all-in-one. Well, here is a shortcut: do not search for
What I do like with this kind of products is that they are high-quality products and tend to be cheap bought as surplus, no Lidl-style marketing needed. I can guarantee such eye-protectors work fine during variety of riding from very cold winter riding to sandy allergenic summer riding. Flying stones, mud and snow are none, even among other traffic and even if you are very allergenic or don't like poor quality of air during some seasons.