The other thing I recall from the era was the Americans with Disabilities Act of 1990. I think it was well into 1992 before vision requirements were relaxed at the major airlines. I seem to recall 20/20 uncorrected was a hiring standard at the major airlines. Also, there was always a big debate on which airlines pilots would be disqualified from working at if they had RK surgery done which airline doctors actively looked for during your employment physical. Shortly thereafter laser surgery came out and it was questioned for a brief period but ultimately accepted as an ok procedure with the Airlines but RK no. In summary, prior to about 92, I think some airlines disqualified you if you didn't have 20/20 uncorrected at hiring.