New materials and chemistry concerned inside the latest generations in the lenses have produced substantial progress in addressing the two fundamental requirements for choice :
More mature generations (and a few present generations) keep a yellow or somewhat jaundiced hue even when not exposed to ultra violet light-weight (indoors for instance). The most recent technology Transitions are widely regarded to become the best obtainable and virtually fully obvious within the absence of extremely violet.
Most more recent photochromatic lenses produce a fast transition from light-weight to darkish as they may be exposed to ultra violet - the actual check and also the differentiation may be the price at which they regress from the darkest tint to clear. Again Transitions lenses are widely thought to be best at school in this regard.
Transitions lenses really are a broadly held trademark for a particular (most recent) era of components and technologies which are combined and offered beneath the "Transitions" brand. Other (but similar) names are not precisely the same, and therefore are normally regarded to be not as very good, as they may be from more mature technology photochromatic technology.
Lastly - never count on your photochromatic lenses (regardless of which brand name or technologies) to make a lot of a difference whilst driving, because the windscreen of a auto is made to absorb the majority of the UV just before it enters the cabin - hence the lenses inside your eyeglasses have practically nothing to respond with. In case you need or would like tinted lenses although driving, you happen to be greater off acquiring two pairs in the identical frame with prescription very clear and prescription tinted lenses.