Now there is no need to buy a second pair of sunglasses, because you have the solution that is called transition lenses.Most glasses and sunglasses are one color.
The lenses stay the shade no matter what intensity of light.Photochromatic lenses are different.They appear clear in low-light conditions, but darken when the lights gets brighter.
With a pair of transition lenses you can forget about the second pair of sunglasses.You don't have to wear with you another pair of sunglasses, and that's equal more space for your packages if you travel.
This is the primary benefit of these lenses.Beside this they also offer protection from UV light.As they are activated by UV rays, the slightest change in light intensity will automatically cause the lenses to darken appropriately.
This type of sunglasses are not made for driving, because transition lenses generally do not work because the car's windscreen blocks most UV light, so that there is not trigger to change the lenses.
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