Why is it that photo gray lenses don't work inside the car?

Question

Or if they do change it is very little, even when the sun is bright.

Answer 1

because photo gray isn't based on the suns light, it is based on UV rays, most cars glass shields us from those rays.

How Do Photo Gray Lenses Work?


In the glass or plastic used to make the glasses lens, silver halide is mixed in evenly. This substance is sensitive to ultraviolet light, and will darken when exposed to it. The drawback of this method is that thicker parts of a lens will turn darker, and if you have differing prescriptions for your eyes, one will look darker than the other. If you don't like this idea, you might want to use two pairs of glasses -- one regular prescription pair and a second prescription pair with sunglass tinting.

Answer 2

This varies a lot depending on the car and the glasses. Most likely the car you are dealing with has windows that are either tinted or treated to deflect some of the glare of the sun.

Answer 3

Hope I helped!