Early retirement due to short-sightedness

[Nicholas49]

Hello

I hope this is the right forum for this question.

I understand that you can fly professionally with prescription glasses, provided that you can still achieve 20:20 vision.

My question in a nutshell is this: do older pilots sometimes have to retire from professional flying earlier than the legal age due to a deterioration in their eye sight? Both my parents are in their fifties and, though they never had to wear glasses when they were younger, they do now. So it must be perfectly plausible that a professional pilot who had 20:20 vision earlier in their career no longer does. Does this put an end to your professional flying career? If so, that's pretty tough, but I guess the medical requirements are stringent for a reason.

Thanks.
Nick