Nothing new about "peep sights", or the technology behind them.
I'm currently reading a book that has a whole section on the superiority of Peep sights over "Blade and notch" style sights..
It's called "The American Rifle" by Townsend Whelen published in 1919.
The only thing new is the idea of putting it on a pistol which flies in the face of his purpose of putting the rear sight as close to the eye as possible.
He goes into the technical reasons for it, and he is talking specifically about rifle sights so I don't see why the eyes natural tendency to center things would not help with a pistol as well.
You have to remember to ignore the rear sight, let the eye do what it does while you just focus on the front sight and target.
Correct.
I did not like that a straight blade is generally used with a peep sight.
The eye doing it's thing longs for a circle to center in the peep.
That same function makes it difficult for the eye to not try to put that circle ON the point of impact instead of just under it.
I would zero this peep setup so that the point of impact was under the dot rather than above it.
True you can't
see your point of impact, but you know where it is gonna be.
I've just never seen peep sights designed for a handgun before.