Transitions, Reactions, Photochromic or Reactolight Lenses
New components and chemistry involved in the newest generations from the lenses have produced significant development in addressing the two fundamental criteria for choice :
More mature generations (and a few present generations) retain a yellow or slightly jaundiced hue even when not exposed to ultra violet light (indoors for instance). The most recent era Transitions are widely regarded to become the best obtainable and almost totally clear within the absence of extremely violet.
Most more recent photochromatic lenses make a speedy transition from light-weight to dark as they're exposed to ultra violet - the actual test as well as the differentiation may be the price at which they regress from the darkest tint to very clear. Once again Transitions lenses are extensively thought to be greatest in school in this regard.
Transitions lenses really are a widely held trademark for a certain (most recent) generation of materials and technologies that are mixed and sold below the "Transitions" brand. Other (but comparable) names aren't exactly the same, and therefore are usually regarded to be not as great, as they're from more mature generation photochromatic technology.
Finally - do not expect your photochromatic lenses (regardless of which brand name or technology) to make considerably of a distinction while driving, as the windscreen of the vehicle is made to absorb most of the UV just before it enters the cabin - therefore the lenses within your glasses have practically nothing to respond with. In the event you need to have or would like tinted lenses while driving, you might be better off getting two pairs in the very same body with prescription clear and prescription tinted lenses.