I was touring my new project in East TX with some raters and reporters. Even before we got in the cart, one of them mentioned (and the others nodded) "I sure hope you don't have any uphill approach shots where the green surface is blind".
That, of course, was mantra of pros as long as I can remember. Even the Golden Age guys suggested that a blind tee shot might be okay, if required by the land, but blind approaches were verboten, nearly at all costs. By the JN era, a visible green was one you could see the base of the pin on your approach shot, nothing less. And, with some questions, these guys said that is what they meant - they wanted to see the base of the pin on the approach shot.
Obviously, that mentality is alive and well, although I suspect here on Golf Club Atlas, that "design rule" is presumed to have been relaxed. My recent experience above reinforced for me that, no, it isn't. Is any POV 100% right? Of course not, and the land still rules, dictating that some greens will be uphill and thus blind.
Since green surfaces tend to tip to the front at 2% or so, that is the max uphill a hole can be and still see the green, i.e., green can be 2 yards/6 feet above LZ from 100 yards out, 3 yards/9 feet above LZ if from 150 yards, etc. I usually check it from a catch basin/low spot in the general LZ area. If it is uphill more than that, I often use a bunker front left and right, spaced to about the outside edge of the green to mark the surface for the player, even if they can only see the top of the flag. Might flare up the back edge or dip the front lip with a false front to enhance vision to at least give a visual clue as to the width dimension of the green, since that is what the players want to know - how far from the edge is a tucked, blind pin?
Just saying.....