Essilor International is an ophthalmic optics company. It designs, manufactures, and markets a range of products for correcting vision, protecting eyes, and preserving visual health, including progressive, single vision, anti-fog, anti-reflective, polarized, sun, and photochromic lenses, reading glasses, lenses for screen use, as well as lamps, filters, magnifiers, optical magnifying systems, and electronic visual aids. The company also develops and markets equipment, instruments, and services for eyecare professionals.