Transitions, Reactions, Photochromic or Reactolight Lenses
New supplies and chemistry involved within the latest generations on the lenses have produced substantial progress in addressing the 2 basic requirements for selection :
More mature generations (and some existing generations) retain a yellow or somewhat jaundiced hue even when not exposed to ultra violet mild (indoors for example). The newest generation Transitions are extensively regarded to become the best available and virtually completely clear in the absence of extremely violet.
Most more recent photochromatic lenses make a rapid transition from light to dim as they may be uncovered to extremely violet - the genuine test and the differentiation may be the price at which they regress in the darkest tint to distinct. Once again Transitions lenses are extensively thought to be best in class within this regard.
Transitions lenses are a extensively held trademark for any distinct (latest) generation of supplies and technologies that are mixed and sold below the "Transitions" brand name. Other (but related) names are not the identical, and are normally regarded to be not as excellent, as they are from older era photochromatic technologies.
Lastly - do not count on your photochromatic lenses (irrespective of which model or technologies) to make much of a difference while driving, because the windscreen of a automobile is created to absorb a lot of the UV just before it enters the cabin - hence the lenses inside your eyeglasses have nothing at all to react with. In the event you require or would like tinted lenses even though driving, you might be better off acquiring two pairs of the identical frame with prescription distinct and prescription tinted lenses.