18m would be a long range for pistol shooting unless you're doing some of the really specialized stuff. 90m is just beyond the pale. "3-3-3" - Three metres, three shots, three seconds - is typical for gunfights according to the people who do and study it for a living.
As others have already pointed out the rear sight or Jim Cirillo's profile acquisition if you prefer that method just helps you align the firearm. Your eye will automatically acquire the target. If you keep the front sight in focus and aligned with the blur that is the target you won't waste time switching your point of view, which just gets harder as your eyes get older.
The pin sights and string sights (or the string itself) that some archers use fill the same function as the front and rear sights.
And drawing to the jaw or ear will only cause the string to slap you in the face if you're doing it Mediterranean style. No need to re-open that particular can of worms.