Polarized lenses are used to make sunglasses; they reduce the intense glare of the outdoors, are a favorite of fishermen, and are now widely available not just in brown and gray, but many more colors. Your eye care professional will be able to assist you regarding which lense color bests fits your needs.
Photochromatic technology, embedded in the lense material, allows the lense to change to a darker tint in the sun and then clear indoors. They are glasses and sunglasses in one. These lenses adjust to the light intensity providing you with more comfortable vision at all times.