Transitions, Reactions, Photochromic or Reactolight Lenses
New components and chemistry concerned inside the most recent generations of the lenses have produced significant progress in addressing the 2 basic conditions for choice :
Older generations (and some current generations) keep a yellow or somewhat jaundiced hue even when not uncovered to ultra violet light-weight (indoors as an example). The newest technology Transitions are broadly regarded to become the very best accessible and nearly entirely obvious in the absence of extremely violet.
Most more recent photochromatic lenses make a rapid changeover from mild to dark as they may be uncovered to extremely violet - the real check along with the differentiation may be the price at which they regress in the darkest tint to clear. Once more Transitions lenses are extensively regarded as best in class within this regard.
Transitions lenses certainly are a widely held trademark for a specific (most recent) generation of materials and technology which are combined and sold below the "Transitions" model. Other (but related) names aren't the identical, and are normally regarded to become not as very good, as they may be from more mature era photochromatic technology.
Finally - do not expect your photochromatic lenses (irrespective of which manufacturer or technology) to produce significantly of the difference while driving, as the windscreen of a auto is made to absorb many of the UV ahead of it enters the cabin - hence the lenses within your glasses have absolutely nothing to respond with. In case you need or would like tinted lenses whilst driving, you happen to be greater off receiving two pairs in the exact same frame with prescription very clear and prescription tinted lenses.