Transitions® lenses react quickly to changing light and can become as dark as sunglasses outside in bright sunlight. As light conditions change, the level of tint adjusts to provide the right tint at the right time. This convenient photochromatic protection against glare is automatic.Transition lenses are available for most prescriptions, and in most lens types. They are available in standard and high index lens materials, and they are typically available in either gray or brown, now green is added. Although there is limited availability in other specialty colors.Transitions® lenses are also compatible with lens treatments and options such as super hydrophobic coating, blue block coating,and be made into progressives. safety glasses and sports goggles, which are also a popular choice for professionals that are both indoors and outdoors in their jobs. Transitions® Signature® GEN 8™ is the most responsive photochromic lens yet. Fully clear indoors, these lenses darken outdoors in seconds and return to clear faster than ever. Although Transitions lenses cost a bit more than regular eyeglasses, if you can use them both as regular glasses and as sunglasses, then you are saving a bundle of money. So, transition lenses are good in the sense that some people can use them very nicely in their lifestyle. Additionally, transition lenses naturally block all ultraviolet radiation from the sun. Many people routinely take precautions to protect their skin against UV rays but are unaware of the need to protect their eyes against ultraviolet damage. Most eye care professionals now recommend that people protect their eyes against UV exposure at all times. Transitions® lenses block 100% of both UVA and UVB rays. In fact, Transitions® lenses are the first to earn the American Optometric Association (AOA) Seal of Acceptance for UV Absorbers/Blockers. Also, because Transitions® lenses adjust to changing light conditions and reduce glare, they enhance the ability to discern objects of varying size, brightness and contrast, enabling you to see better in all light conditions. Transitions® lenses automatically darken depending upon the amount of UV radiation present. The brighter the sun, the darker Transitions® lenses get, all the way to as dark as most sunglasses. So, they help enhance the quality of your vision by reducing the sun’s glare in different light conditions; on bright sunny days, on cloudy days and everything in between. Photochromic sunglasses are a great option.