What do you suggest, diginagain? A whip-round to buy him MS Flight Sim and a multi-function controller?
The reality seems to be ...
1. Asthma. So that's endex for aircrew, isn't it?
2. Contact lenses. I staffed the approval for contact lenses for aircrew to ACAS, so I assume that's a partial solution to the ocular problem.
3. Mental health. Tricky, Really tricky.
4. Twittering on PPRuNe. Self-control would help. [see 3.]