I'm kind of with you on this one... I started MA in 1962 and was taught from about my second class to attack the eyes with both ippon nukite and a "full spread" of fingers. We spent endless hours of punching at cardboard cutouts hung by a string that had "eye-holes" in them.
It was "just another target", and we focused on being accurate with our strikes, and being "lightning quick" with the strike, in case we were facing multiple attackers. We did the same basic technique and skills training in both Isshin Ryu and Shotokan... and most of the other schools I visited during that time practiced much the same set of skills.
My question is "what is 'dirty fighting'?" Fighting is fighting, and unless you're fighting as a sport, anything goes. If you want to fight "with rules", you have to make a sport out of what you're doing, and "dumb down" the techniques for safety. If you're training to fight, you learn control (not an instruction) and learn to fight using it.
That point defines the difference between "modern" MA and "old style" MA... when you can go full force, full tilt, without pads, then you need "skills"... everybody else needs pads.
As for the "printed material", I have one of Mas Oyama's books circa 1964 that teaches "sanbon nukite" (3-finger upward strike to the eyes) and has multiple examples of its use in ippon kumite (one step sparring)... clearly, that's "pre-1993". The book was written by Bobby Lowe, and pretty typical of the books on karate in that era. I also have an old Bruce Tegner book around here somewhere that probably has the exact same material in it...
Eye-gouging wasn't the discovery of fire...