Photochromic lenses have an adjustable tint that changes with the amount of available light. In bright sunlight, they darken; indoors, they become clearer.
Is that better for my eyes?
In some ways, yes. As photochromic lenses darken they reduce glare that can contribute to eye strain.
Aren't photochromic lenses heavy?
Not anymore. For years, photochromic lenses have been made of glass. However, in recent years, plastic photochromic lenses have been developed.
photochromic plastic lenses are available in almost any lens style. These lenses can also combine the most advanced photochromic technology with thin, lightweight high index material and are available in a wide variety of advanced lens designs, including single vision lenses, bifocals, and progressive lenses. Photochromatic plastic lenses also
provide built-in UV protection and are treated with a scratch resistant coating to make them more durable.
