Missfive photochromic bifocal presbyopes 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 non-magnified area is sufficient for distance vision (watching TV/driving), while the precisely magnified reading area is perfect for reading small print/writing/eating comfortably and other close-up activities. With Missfive photochromic bifocal eyeglasses, you can work/read comfortably on your balcony or in your yard with clear views of near and far in the sun.