I did a test on the Hydro-optix when they first came to my shop....I have 20/20 vision, so I had to be fitted for contacts with a +3.5 correction. If you have never worn contacts, It's an experience. The mask is definitely everything they say it is.....WIDE field of unobstructed view, corrects size & distance perception. I will definitely agree with the fogging issues stated above by sea yoda (thanks for the baby shampoo tip) I used sea gold, 500 psi, and lemon joy all with little effect. I didn't use it enough to have scratching, and had no leaking or clearing issues. I thought the snap on diopters for surface vision were more trouble than they were worth, and I could see well enough to get out of the water without them, where I would don a pair of prescription sunglasses that were the opposite correction (-3.5), and bring my vision back to 20/20. All in all, I can see where it would be useful for photography, or even hunting, but in all honesty, when you have enough diving under your belt, your brain will automatically correct the size & distance perception anyway, so I chose not to deal with the extra hassle of contacts, etc. and just stuck to my flat mask.