If your glasses often fogging up, I advise you to rub some plain soap into the glasses and then wipe it up with a napkin as usual. When your eyeglasses keep slipping down, take two rubber bands, tie them round the temples of the glasses. That's it, no more slipping down! If you're just trying to pick up a new pair of glasses or buying eyewear for the first time, don't forget to take the table test. Simply put the eyeglasses right on the table and then carefully look at the glasses' temple tips, whether they both reach the table surface or not. If not, it means the temple tips are of different length! It may cause a lot of discomfort while wearing them. In case you have high myopia of −6.00 diopters or more and accidentally lost your eyewear on the working desk. Grab your phone, turn on the camera and zoom in on the table surface until you see your glasses.