My 15-plus years of unscientific research concluded that more than 90% of Saudi citizens wear eyeglasses. Seldom seen is a Saudi with two eyes pointing in the same direction.
Every year the Saudi air force puts on an air show for the king. I remember watching the practice one year. Obviously, one of the four pilots was a local. He could not keep formation. He drifted left, then right, then up, then down. It was funny (but dangerous) to watch.
The air show was a smashing success that year - all four pilots in the show were United States pilots.
Interesting!
Many years ago Lockheed (Marietta, GA) had a bunch of mainframe computers from my then-employer of which I personally supported.
One of the old timers nearing retirement told me about the time a crew of Saudis were at the Marietta Lockheed facility learning to fly the jet fighters they were purchasing. One of the Saudis almost crashed one of the fighters. The Saudi diplomat on site for the training took the Saudi pilot that almost crashed the plane and shot him dead.
Diplomatic immunity, you know!