There are several parts that make up a pair of eyeglasses.
True to its name, these binocular magnifiers can fit over your usual pair of eyeglasses or can be worn without your eyeglasses.
When purchasing clip-ons for your child, always bring along the specific pair of eyeglasses you want to use a clip-on with so you can be sure that the clip-on will fit over them.
If you've already got a pair of eyeglasses you like to wear, but need sun protection and something to cut the glare, consider some clip-ons from the Calvin Klein collection.
In most sports, your everyday pair of eyeglasses won't work.