Many people wear eyeglasses, maybe few of them know about transitions eyeglasses. They are weaker version of regular glasses, if you are not used to prescription glasses you ordered, transitions eyeglasses may be the best choice for you. You thought that you didn't need to take the sunglasses with you everywhere you went. Before spending the extra money for this type of glasses I did the research. I thought I had everything covered with the research, but seems like I missed one major item. And I have been miserable ever since.
From my research most factory windshields are built with a vinyl interlayer between the glasses that you really can't see they are then fused together. According to the information I found at Carlite, who manufactures factory quality windshields for many vehicles, this layer is also a solar tint which absorbs Ultraviolet rays from entering the vehicle. This interlayer doesn't darken the windshield that you can really notice, but instead by blocking the UV rays, which prevents the Transitions lenses from getting darker while in a vehicle. While you are in a vehicle, your glasses don't get darker, and you are left squinting. Granted you are not being damaged by UV rays, but if you can't see because of the sun you run the risk of getting in an accident.
The way that Transitions glasses work is they will darken when you go outside and go back to clear when you come back inside. The way they do this is with the UV rays. When the UV rays are detected, they will darken. They reduce the glare and keep you from squinting outside in the bright sunlight. According to their website, it works with photochromic dyes which darken when exposed to ultraviolet rays from the sun. Once there are no ultraviolet rays from the sun they will clear up. So when you are out in the sun, they act like sunglasses, when you come back in a building they are like regular glasses. Since ultraviolet rays can damage your eyes, the glasses are blocking 100% of the rays, and in the long run will protect your eyes.
Now the problem comes when you are driving a vehicle or a passenger and it is very sunny outside.If you are like me you got transitions eyeglasses for you presciption glasses last time you got a prescription glasses thinking this is great, no need to change glasses when going out in the sun, and they will change back to clear when you go inside automatically.
