If you need clear prescription lenses indoors or when driving at night, but you also want the comfort of sunglasses without having to change back and forth, then Transition lenses may be “just what the doctor ordered.”
Transition lenses are clear indoors and at night but will darken when exposed to sunlight. They also provide full ultraviolet (UV) protection, so they help keep your eyes both safe and comfortable.
In the simplest terms, a photochromic lens changes color because of a chemical reaction inside the lens. When you wear your lenses outside, exposure to UV light triggers molecules which undergo a chemical reaction that turns the lens darker. When the lenses are removed from bright sunlight, either on cloudy days or indoors, not enough UV light is present to maintain the chemical reaction – and the lenses return to their original, clearer state.
Transition lenses “at a glance”
- Transition lenses darken in sunlight and become clear when indoors and at night.
- The shade goes from dark to clear – usually within 1-2 minutes.
- Lenses will be darker in colder temperatures.
- Photochromics are available in plastic, glass & polycarbonate materials as well as single vision, bifocals and progressive designs.
- Gray and brown tints are also available.
- Lenses don’t darken behind car windshields because the glass blocks out the UV rays that trigger the color change.
- There are specialized designs for almost any activity (polarized photochromics for water sports and fishing, etc.) so be sure to mention your hobbies and interests whenever your eyes are examined or you are replacing your eyeglasses.