With irons you focus on the fore sight. It is acceptable that the target will appear greyish/fuzzy.
Diopter/aperture sights are looked through not at (yeah takes practice as @Tentman has pointed out) and the mind will auto centre through the centre of the aperture.
The larger hole in the aperture the better. Many think a small hole aids accuracy. 1.2mm or bigger was optimum in smallbore.
There used to be stories in one of the British target shooting mags of the day of an old shooter (long ago dead) that used to train the newbies. His party piece was to shoot with the rear adjustable aperture removed and sighting just through the threaded hole. He would thrash everyone. Another one of his teachings was position, position, position. He would challenge the young shooters to a contest. They all fully fitted with sights. He with the whole adjustable aperture sight removed and just aiming with the foresight ring. He would still beat them.
When I shot fullbore I used a foresight ring element that framed all 4 corners of the target. Only issue with that was if the markers didn't push the target fully up every now and then you got a bad elevation shot. I later went back to using the black aiming mark.
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