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I didn't find anything significant in that link that surprised me. In fact, that diagram of the distribution of rod and cone cells as a function of angular distribution across the retina is almost exactly what I've used in my classes (I'm a retired professor of anatomy and physiology). Scotopic and Photopic vision isn't as cut and dry as I may have implied in my first post, but I was keeping it simple for the mixed audience (so to speak). A useful tip that's part of Auxiliary training and based on the aforementioned distribution of cone vs rod cells is that, when you're scanning the waters you want to look to the side of what you're examining, so that you make use of the rod cells at the periphery of your retina rather than the cone cells in the central portion (a.k.a., the Macula area surrounding the fovea).

Anyway, best regards, and have a Happy Holiday.