Sports Frame is Lightweight But, for Safety Eyeglasses with Wraparound Design that Provides Increased Side Protection and Peripheral Vision Photochromic lenses are transformed from indoor reading glasses to outdoor reading glasses. They can also be used as ordinary photochromic sunglasses with UV protection. UV400 rated sunglasses are essential for filtering out sunlight reflected glare and protecting your eyes against long term UV damage when you go out. Note: This is not sunglasses! ! The photochromic lens changes according to the intensity of ultraviolet rays. The stronger the ultraviolet rays, the deeper the discoloration, and the weaker the ultraviolet rays, the lighter the discoloration. (We will check carefully before leaving the warehouse). [Notes]It will take some time to adapt after you wearing the bifocal reading glasses. We suggest you at least try the glasses on for a week, then if there's anything need our assistance, please contact us Double light Glasses，Read a medicine label, do a crossword, watch TV, and see in the distance all with one pair of readers.