New supplies and chemistry involved inside the latest generations from the lenses have produced significant development in addressing the two fundamental standards for selection :
Older generations (and a few current generations) keep a yellow or slightly jaundiced hue even when not exposed to ultra violet mild (indoors for instance). The most recent generation Transitions are broadly regarded to be the top offered and practically entirely obvious in the absence of extremely violet.
Most more recent photochromatic lenses produce a speedy transition from light to dim as they are uncovered to ultra violet - the genuine check and also the differentiation will be the rate at which they regress in the darkest tint to obvious. Once more Transitions lenses are broadly regarded as greatest at school in this regard.
Transitions lenses are a extensively held trademark to get a specific (newest) era of materials and technologies which can be combined and offered beneath the "Transitions" model. Other (but similar) names are not the identical, and are usually regarded to be not as great, as they may be from older era photochromatic technologies.
Lastly - never expect your photochromatic lenses (irrespective of which brand name or technologies) to create a lot of a distinction while driving, because the windscreen of the auto is created to absorb a lot of the UV ahead of it enters the cabin - therefore the lenses inside your eyeglasses have nothing at all to respond with. In case you want or would really like tinted lenses although driving, you happen to be far better off getting two pairs of the same body with prescription very clear and prescription tinted lenses.