I second the Barz! We wore them the whole Tybee as well... The photocromic lenses definitely helped on mine. I was able to wear them, like Tad said, basically until the sun went down. My crew opted not to spend the extra money on that option as he already had to pay for the prescription lenses and he could not wear his as long as I could wear mine.
My crew is blind as a bat and was psyched for his first pair of prescription sailing goggles. He was amazed with the quality of the lenses and how well Murrays did fitting his prescription.
Leaving Jupiter, it was very overcast and nasty out. I was thankful for the photochromic option as I was able to leave them on during the screaming jib reach.