A I always suggest to my patients to do whatever is medically necessary, or more beneficial, first. And while the appearance of your nose is very important to you, I believe improving your vision would be of a much greater benefit to you. As for the timing, obviously you would need to coordinate with both surgeons as everyone has their specific protocols. In addition, it depends on what type of rhinoplasty you will need, a dorsal hump removal with osteotomies, tip work, or a combination of both, etc...
In summary, see what is most important to you and consult with surgeons you trust and hopefully you'll be able to correct both issues.