The color of transition lenses changes according to your position. As we all known, transition lenses provide protection from the harsh rays of the sun. Therefore, these lenses would become darken under sunlight to resisit sunshine. But when you are indoors of out of sunlight, it would become clear lenses.
Yes, the transition lenses will get darker over the time because of the shining lights. Transition lenses offer the convenient advantage of eye protection from the harsh rays of the sun on demand. Known as "photochromatic" lenses, these eyeglasses darken under bright sunlight to serve as sunglasses, and then return to a clear lens when the wearer moves indoors or out of direct sunlight. As helpful as these glasses may seem, a few problems exist that make their use a tossup. Many people tend to wear the transition glasses to help them get the right vision. When you go out, you could regard it as the sunglasses to use. You could go to the online store to buy one because of the suitable price.
Well, generally speaking, I have to say that the transition lenses will get darker over the time. As we know that there is sunlight outside, when you go out, your transition lenses will be lighted by the shining lights. So it can be normal for the lenses color become darker. Transition lenses which are known as "photochromatic" lenses are served as sunglasses to darken under bright sunlight. And it can protect your eyes from the strong light. And also, it can give a clear lens to the person who wears them. But with the time going, the exposure in the sunlight also can make the transition lenses become darker because of the special materials in the lenses.
Indoors and at night, photochromic ("Transitions") lenses are clear, while they darken in response to sunlight. Typically, during the first minute of exposure to sunlight, they will darken significantly, and then continue to darken slightly over the next 15 minutes. For the remainder of time spent in the sun, they will adjust as the light changes. Then, when you go into shade or indoors, they will begin to clear up, becoming significantly lighter in the first five minutes, and then gradually getting lighter until they're completely clear, usually between 10 and 20 minutes after going back inside. The lenses are meant to last as long as the prescription, which is between two and three years. After that, one may notice a residual tint regardless of whether there's sunlight; at this point, the lenses will need to be replaced. However, your lenses would need to be replaced either way at this point, as your prescription would be out of date.