One should wear safety glasses to prevent things from getting into the eyes. Another reason to wear safety glasses is so that heat and sparks don't irritate them.
Safety glasses should be worn
Prescription glasses generally do not provide sufficient eye protection, particularly on the sides. There are several styles of laboratory eye protection that are designed to fit over prescription glasses; you should wear the prescription glasses and safety glasses or safety goggles as well. It's also possible to buy prescription safety glasses, but they're fairly expensive. Again: Ordinary prescription glasses are not a substitute for safety glasses/goggles.
you should put on safety glasses
They actually should do a very good job with toothbrushes, though that's not the standard use. Basically they should inhibit bacterial growth and keep the brushes sterile.
Safety glasses are designed to provide clear vision while protecting your eyes. They should not interfere with your vision on a forklift if they are properly fitted and have a clean lens. It is important to wear safety glasses to prevent potential eye injuries in the workplace.
Any tool supplier, hardware store, home improvement store or industrial supplier should be able to sell you some great safety glasses. The type you get will depend on what you are planning to use them for. If you will be using them daily for work and wear prescription glasses, you can also get great prescription safety glasses at the optometrist's office.
the number 3.0 describes the level of shade protection in the glasses. Green safety glasses are worn when you are used to protect your eyes when you are working with metal. Specifically, 3.0 glasses should be use when you are torch brazing, torch soldering, or cutting metal.
put safety glasses on
Shooting glasses and hearing protection are the most important.
Safety glasses should be wore at all time when hammering a nail for a few different reasons. If helps from getting a nail in your eye, the hammer clawing you in the eye and any piece of the nail or hammer for your eyes.
An ordinary plastic pair of safety glasses should prove quite adequate. Make sure that they fit comfortably, using the adjustable strap. You can pick them up cheaply from any DIY store.