Don't bother with Transition lens if your power is high unless you really really want it. Because it is thicker than normal lens so you really need high index lens which is very very expensive. Lens normally last 1-3 years before it gets scratched one way or another.

Get a clip on instead.

Also it's not efficient for driving since less UV gets in the car so it won't turn as dark as you want it to.

New types turn black and back to normal pretty fast.