As I have quite severe astigmatism I cannot get corrective lenses in my swim goggles. So went to contacts. They were wonderful as I could see even the smallest numbers on my watch. Had to stop using them as the glaucoma in my left eye was getting to the point where if it was left any longer I could have non reversable optic nerve damage. So the Doc installed what amounts to an extra drain (its called a bleb) and advised to stay away from the contacts. So back to squinting at the old watch and incomplete info.
But I stress that the contacts gave great results.
May we swim with ease at the speeds we choose.