We often chat about holidays with the opthalmologist, while waiting for my husband's eye drops to take effect and the destinations are ones where flying would be assumed. It's never been suggested that flying is unwise in relation to his retinopathy, for long or short haul. I'm sure something would have been said, if it was likely to cause damage. You should, of course, ask a suitably qualified medic about your own case, but my guess is that for most situations, it's not an issue.
Sally