Transitions, Reactions, Photochromic or Reactolight Lenses
New components and chemistry concerned in the most recent generations from the lenses have produced important progress in addressing the two basic conditions for selection :
Older generations (and some present generations) keep a yellow or slightly jaundiced hue even when not uncovered to ultra violet light (indoors for instance). The latest generation Transitions are extensively regarded to become the most effective available and nearly fully distinct in the absence of extremely violet.
Most newer photochromatic lenses produce a fast changeover from mild to dark as they are exposed to ultra violet - the true test and the differentiation may be the price at which they regress in the darkest tint to obvious. Once again Transitions lenses are broadly regarded as best at school in this regard.
Transitions lenses are a extensively held trademark for any particular (most recent) technology of supplies and technology which can be mixed and offered beneath the "Transitions" manufacturer. Other (but equivalent) names will not be exactly the same, and therefore are typically regarded to become not as excellent, as they may be from more mature generation photochromatic technology.
Ultimately - don't expect your photochromatic lenses (irrespective of which manufacturer or technology) to make a lot of the distinction while driving, as the windscreen of the automobile is made to soak up most of the UV ahead of it enters the cabin - therefore the lenses inside your glasses have nothing to respond with. If you need to have or would really like tinted lenses even though driving, you're far better off obtaining two pairs on the same body with prescription clear and prescription tinted lenses.