FEIVSN photochromic reading glasses are ideal for all-day wear, with UV400 protection as the lenses quickly and automatically darken when exposed to UV rays. Once you are indoors or at night, the lenses will remain colorless and clear. The full precisely magnified reading area is perfect for reading small print/writing/eating comfortably and other close-up activities. With FEIVSN photochromic full lens reading sunglasses eyeglasses, you can work/read comfortably on your balcony or in your yard with clear views of near and far in the sun.FEIVSN photochromic reading sunglasses vintage aviator style frame with fixed hinge, high quality lightweight pc frame, these sun readers have 3 colors for choosing: black, brown, pink, suitble for men and women, full lens reader sunglasses auto changes color with 10 degrees: 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.5.