where can i find replacement lenses for them?

[Grandfather]

I have a pair of old frogskin purple sunglasses where can i find replacement lenses for them?

[Grandfield]

Go to a store that sells sunglasses or an optometrist and see if they can replace the lenses for you. Or just look for sunglasses with the same shape as your old ones by yourself , and then poke out the lenses and put them into your sunglasses. Just do it yourself.