Supposedly...And supposedly a legendary pilot with the initials CY can do that. If that is wrong, then like the song said: "I don't wanna be right."
Understand this...Having 20/20 vision is not extraordinary. A great deal of the general population is that. When I joined the USAF back in 1983, I was 20/10 right and 20/15 left. When I was taking flying lessons in high school, flying over the Arizona Memorial in Pearl Harbor, I could make out ground details, including the submerged Arizona herself, that my instructor could not. When you are over cloud ceiling, the cold air up there can be unbelievable clear. Anyone would be surprised at how good his/her eyesight, assuming no glasses, could be.
It is not just about eyesight but about training. Yes, you can train your brain to automatically focus on certain tasks. Radar is there to help you steer to the general direction of your interest, but within visual, it is your eyesight and your brain that will either save you or fail you. A flicker of the wing and you can, with training, tell what he is going to do. With training in understanding how adversary aircrafts perform, you can, with good odds, anticipate your opponent's maneuver and get the inside of a turn, if your aircraft can give you that edge.
In the comedy Top Gun, the pilots were shown flying without their tinted visors. That is practically a sure way to kill your excellent eyesight, the good thing that got you into flight training in the first place. In ACM, a sudden flash of the sun into your unprotected eyes, or even a glint of sunlight off a canopy, can kill you. A simulated death, hopefully. But even while wearing tinted visor, with training, and note I use that word a lot, your above average eyesight-brain coordination can give many details of the other guy, the one you are trying 'shoot'. But you have to train and train and train and train and train and train and train and train -- for that skill.
Final edit...
When I transitioned from the visually confined F-111 capsule of a cockpit to the bubbleheaded cockpit of the F-16, it was like: Free at last, I am free at last...!!!