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Photochromic lenses work with certain molecules, which are built into the lens. They are transparent when the light without the UV rays. However, when UV rays hit the molecules, they react to them, changing the shape. This case causes the lens to darken. More UV radiation strikes the molecules, the darker the lens becomes.
These lenses to solve problems for people who need to wear glasses, and can not wear sunglasses but prescription of them. You no longer have to wear two pairs of glasses, making things much easier. Most people would not be more than one pair around sacrificing protection for the eyes. If you have a pair of photochromic glasses, which you have a recipe to have the best of both worlds.
When moving, these points can be particularly useful. We want to go inside and outside a lot during the trip so that the presence of one of these points may be necessary. You no longer have to stop to go to the sunglasses, when the sky suddenly becomes brighter. For sports, it can be very useful. Especially if you play sports in the open air and sunlight, changes associated with the clouds moving, it’s great that the sunglasses, which can respond to this. If you play tennis or volleyball, for example, there is no time to stop in the middle of the game to go switch glasses, especially if you play in the competition.
It is better for a small number of people, but it is not so good a job as a defense than the quality of lenses. The choice between these will also depend on your eyes. If you are more sensitive to light, it might be worth it to pay extra for photochromic glasses that darken more as it gets brighter outside.