Comments about Cressi Corrective Lens for Fast Goggles (-):

I bought this along with the fast goggle frame. The diopters lenses do not fit. There is serious space/gap left in between even after you insert the lenses properly and as tightly as you can. The first time I used it, the lenses actually popped out of the rubber frame! Because Cressi has changed the specs of fast goggle frame, the diopters lenses from previous production no longer fit snugly. It IS difficult to insert the lenses properly by the way. The lenses are too dark for some indoor pools. Try Finis or TYR optical goggles instead.