( not aimed at you AMEandPPL)
No offence taken, I assure you. My response was MAINLY aimed at the colour deficiency aspect of the original post, making it clear that that is not amenable to any surgical correction.
I probably understand this topic better than most AME's, having one eye which is less than 6/60 without correction, and the other which is nearly amblyopic due to a congenital cataract. I would certainly not get a class 1 because of these, but then I don't want one !
But I've had PPL and flown regularly and safely for last 25 years, without any problems or incidents.
how many accidents are documented where vision has been a key factor?
Good question, and I could not give you an answer or any figures on this.