Transitions, Reactions, Photochromic or Reactolight Lenses
New supplies and chemistry concerned inside the most recent generations on the lenses have created considerable progress in addressing the 2 basic standards for choice :
Older generations (and a few present generations) keep a yellow or somewhat jaundiced hue even when not uncovered to ultra violet light-weight (indoors for instance). The most recent generation Transitions are extensively regarded to become the top available and virtually totally obvious within the absence of extremely violet.
Most newer photochromatic lenses produce a rapid changeover from light to dim as they're exposed to ultra violet - the true check and also the differentiation may be the rate at which they regress from the darkest tint to obvious. Once again Transitions lenses are extensively regarded as best at school within this regard.
Transitions lenses certainly are a broadly held trademark for any distinct (latest) era of components and technology which can be mixed and sold beneath the "Transitions" brand. Other (but equivalent) names usually are not precisely the same, and are usually regarded to be not as good, as they are from more mature era photochromatic technologies.
Ultimately - don't expect your photochromatic lenses (regardless of which brand or technologies) to produce a lot of the distinction whilst driving, as the windscreen of a automobile is created to soak up a lot of the UV prior to it enters the cabin - therefore the lenses in your glasses have practically nothing to respond with. Should you need to have or would like tinted lenses whilst driving, you're better off acquiring two pairs from the exact same body with prescription distinct and prescription tinted lenses.