Flip 'N' Focus MagnifiersIdeal for knot tying and other tasks requiring precise vision, these clip on magnifiers securely attach to any existing glasses. Keep them flipped up for storage and flip them down for easy access when needed and they are so light you won't notice the difference. These come in three magnifications and have a larger field of vision than many magnifiers. Increased lens size for larger field of magnification Strong flip clip to raise and lower magnifier