Getting in the habit of grabbing a pair of safety glasses or goggles whenever you go outside to do yard work takes a bit of practice, but it could pay off in the protection you get from simple, preventable accidents,
Keep a few pairs handy in the mudroom or on the porch, ready to take with you whenever you go to chop wood, do yard work with a string trimmer or weed whacker, or out to prune trees.
Even one episode of getting a stick in the eye can cause a lot of pain and grief, which is avoidable with the use of the cheapest safety glasses.
The advantage of goggles over glasses is that they have more protection for the sides of your eyes, which really helps protect your eyes from dust or small particles that could be thrown up by a sander or other woodworking machine.
Other common glasses that are more specialized are welding goggles, which are really dark. They will protect you from sparks and also from the extremely bright flame of a welder or plasma cutter.
Never go anywhere near a welder without the proper safety gear, whether you are the one doing the welding, or just observing.
Most often, the type of safety glasses you buy will be plastic, and very low cost. That's a good thing, as you will no doubt put them down somewhere and forget where, or they will fall and break.
Once you get used to wearing safety glasses or goggles, it becomes habit.
Over time, the lenses will scratch, making it uncomfortable to wear them. This is a good time to replace them. For the cost of a few dollars, you can buy several in a package - they're so economical that your employer may just provide them for you.
The minimal cost is offset by the number of man hours saved by just one preventable accident.