Scuba diving masks are generally available with the front lens being either mono (singular) or dual (double).
In the case of the Cressi Pano 3, its front lens is mono; which provides an uninterrupted field of view at the cost of being unable to accept corrective lenses.
(Although there is a version of it that has a double front lens – the Cressi Pano 4).
Because I’m lucky enough to not need corrective lenses, I personally always opt for a mono lens as you can see just a little bit more!
Where the Cressi Pano 3 really stands out; are its side windows – an extension from either side of the front mono lens that expands peripheral vision.
This is a really cool and unique feature which incredibly few scuba diving masks have. It really does let you see a little bit more to the side where your vision would be cut of by a normal dive mask.
If you’re going to be scuba diving somewhere where the main thing to see are sweeping expanses – e.g. coral reefs or wall dives this comes in seriously handy!
It might not be so useful if you’re looking for macro (small critters) however (although it won’t be a hindrance!).
Check out the photos to right to see examples of the side windows in action!