Note:Please press the lens with the glasses cloth, do not touch the lens directly with your hands, which may leave finger marks. When you find that the air bubbles cannot be removed during sticking, please remove the lens first, make sure the lens is dry, and then try to stick it again. If you have any other problems, please contact us for a timely solution. Suitable for More Glasses:Bifocal Reading Lenses can be attached to all kinds of glasses, such as sunglasses, ski goggles, blue light blocking glasses , etc. It's good for you to do experiments in laboratory or go out fishing, cycling, driving, swimming, cycling, diving, skiing. No Water Needed:These Stick-on Bifocal Lenses easy to use, no water is needed. When you find that the position of the sticker is not accurate, you can remove it first and stick it again. Clear Vision:If you wear the sunglasses and have trouble seeing near clear, maybe you just need a pair of glasses, choose the correct degree, it will help you see close objects clearly, like your phone screen. Bifocal Reading Lenses:Attach the reading lenses, the glasses will become bifocal lenses, see close objects clearly through the attached lenses and through other areas look at distance .