Transitions, Reactions, Photochromic or Reactolight Lenses
New supplies and chemistry concerned in the latest generations from the lenses have created important progress in addressing the two fundamental requirements for choice :
Older generations (and some present generations) keep a yellow or slightly jaundiced hue even when not exposed to ultra violet mild (indoors for example). The most recent technology Transitions are widely regarded to be the most effective accessible and almost fully very clear in the absence of extremely violet.
Most more recent photochromatic lenses create a fast transition from gentle to dim as they are uncovered to extremely violet - the genuine test along with the differentiation may be the price at which they regress from the darkest tint to clear. Once again Transitions lenses are widely regarded as very best at school in this regard.
Transitions lenses really are a widely held trademark for a particular (newest) era of supplies and technology which can be mixed and offered beneath the "Transitions" brand name. Other (but comparable) names are not exactly the same, and therefore are usually regarded to be not as excellent, as they're from more mature era photochromatic technologies.
Lastly - do not expect your photochromatic lenses (irrespective of which manufacturer or technology) to produce significantly of a distinction whilst driving, because the windscreen of a car is made to absorb a lot of the UV ahead of it enters the cabin - therefore the lenses within your eyeglasses have practically nothing to react with. Should you need or would really like tinted lenses although driving, you're much better off acquiring two pairs from the same frame with prescription clear and prescription tinted lenses.