Well, it's a thought. Many of the top archers use a plain open ring as a sight. If you are using a sight If you have a ring sight of some form, you'll find that your eye is exceptionally good at telling if the target is in the centre of the ring. You just need to look at the target, and your body will automatically centre the ring around it. Any sight will do, this is a particular point of personal preference.
Pins work better in some situations, aperatures in others.
International rifle competition uses an aperature sight for the small bore shoots. The target is centered within the aperature, and the bullet goes in the center of the aperature. Even in a hunting situation, both eyes open is a far better way to go. Focusing on the target is also the only way to go, even with firearms - both iron sights and with advanced optics. This is an aspect of marksmanship that transfers from firearms to archery exactly as I have been taught, and now teach.