Transition sunglasses can be wore both inside and outside,the colour will change automaticly acording to the change of light conditions.Sunglasses of the same brand and refractive index ,transition sunglasses are more expensive than sunglasses with tints.

So,where can I buy cheap transition sunglasses, my SPH is -6.00, can I have this kind of prescription sunglasses with large frames, I think that's pretty cool!