Transitions, Reactions, Photochromic or Reactolight Lenses
New materials and chemistry involved in the newest generations from the lenses have produced important progress in addressing the two fundamental conditions for selection :
Older generations (and a few current generations) keep a yellow or somewhat jaundiced hue even if not exposed to extremely violet light (indoors for example). The newest era Transitions are widely regarded to be the top offered and virtually entirely obvious within the absence of extremely violet.
Most more recent photochromatic lenses create a speedy changeover from mild to darkish as they are uncovered to ultra violet - the real check and the differentiation may be the rate at which they regress in the darkest tint to distinct. Again Transitions lenses are broadly regarded as best at school in this regard.
Transitions lenses really are a widely held trademark for any specific (most recent) technology of materials and technology that are mixed and sold beneath the "Transitions" brand. Other (but related) names usually are not the same, and are usually regarded to be not as excellent, as they may be from more mature era photochromatic technology.
Ultimately - do not expect your photochromatic lenses (irrespective of which brand name or technologies) to create a lot of a difference whilst driving, because the windscreen of the car is designed to soak up the majority of the UV ahead of it enters the cabin - hence the lenses within your glasses have absolutely nothing to respond with. In case you want or would like tinted lenses even though driving, you might be much better off getting two pairs from the very same frame with prescription obvious and prescription tinted lenses.