How do I test my transition lenses?
When in contact with UV light, the photochromic particles are activated in 20 to 30 seconds. If you’re not sure, cover one of the lenses with your hand, then put the sunglasses on, wait 20 to 30 seconds and check the difference between the activated and non-activated lens.
How clear do Transitions lenses get?
Transition lenses never get clear Transition lenses do get clear, especially when indoors and the source of light change is absent. Some transition lenses do acquire a small tint indoors, but the Transition Signature series guarantees a crystal clear lens indoors.
How quickly do transition lenses clear?
How fast do Transitions lenses work? Transitions lenses begin to darken the moment they are exposed to the sun’s UV light, reaching 70% tint within 35 seconds. When UV rays are no longer present, the lenses immediately begin to fade back, achieving 70% clear in just a few minutes.
Does UVC activate transition lenses?
Yes. Transitions lenses block 100% of both UVA and UVB rays. Outdoors, Transitions lenses automatically darken depending upon the amount of UV radiation present. The brighter the sun, the darker Transitions lenses get.
Why don’t my transition lenses get dark?
Temperature affects how Transitions change. When they’re hot (like in the summer), the lenses will change slower and won’t get as dark. When Transition lenses do wear out, they will take on a yellowish tinge when they’re clear. They will no longer get as dark at that point.
How do you measure MTF on a lens?
In practice, MTF can be measured by presenting a series of sine-wave targets of increasing spatial frequency to the system under test, and then measuring the contrast in the corresponding image patterns. Plotting the ratio of image contrast to target contrast against spatial frequency will then produce the MTF curve.
Why are my transition lenses stay dark?
When it is colder outside you may notice that your Transitions lenses seem to get darker than they do when it is warmer. This is because the molecules move more slowly when they are cold, which means when they are cold they will fade back from dark to clear more slowly.
Which is the best transition lens on the market?
One of the most popular transition lenses on the market, Transitions® XTRActive® lenses are the fastest and darkest photochromic technology yet. Their ability to quickly adapt to changing light conditions means you’ll get the tint you need in no time.
What does transitions mean in terms of lenses?
Transitions is a brand name for the more generic term, photochromic. It reacts to excessive light and UV exposure. These are the lens that gets darker when you walk outside. The tints vary too, you can get them from a light to a dark or medium to dark, really it’s up to you and your preferences.
Which is better transitions or other photochromic lenses?
Though the cost of Transitions is higher, they have better quality than other photochromic lenses on the market. Oftentimes, the photochromic capability is applied as a thin laminated film on the lens; thus, it can start to peel away over time. Since the dye in Transitions is part of the lens, it’s far more durable.
Is the Transitions Signature lens good for driving?
The main concern glasses-wearers have with the Transitions Signature lens is that it doesn’t get dark enough in the sun; the XTRActive lens solves that. It’s also activated by both UV light and available light, so though it becomes slightly tinted in the car, this tint is generally not enough if you’re looking for good driving sunglasses.