Lena Miculek Boon is the daughter of competitive shooting legend Jerry Miculek, and she’s a competitive shooter in her own right. Both of them have extensive instructional videos on YouTube, often appearing together, although Jerry is mostly retired now.
Lena’s latest is this detailed overview on vision, which I highly recommend. Just remember that in real life, her video is made where she’s looking at a camera. You too should use a camera or a mirror to run these exercises; never point a weapon at another human being unless you’re ready to destroy that person, which obviously takes us outside of the training realm.