need some help here!!

there are some 'wrinkles' the surface of the lens of my sunglasses. not sure what's the problem. went back to the shop (focus point) , but as it's more than 1 year old, they want to charge me rm400++ to change the lens.

would like to know is it normal for the repair cost to be so expensive? or are there any other alternatives where i can get my sunglasses repaired?

thanks very much for your advices.