Pretty sure myopia rates increased quite a bit in the 20th and 21st centuries. Scientists now think myopia is heavily related to sunlight exposure in youth: don't get enough bright hours, get myopia. 3 is the recommended minimum for outdoors time.
Some areas in Asia have >80% myopia rates.
(As an ally myself, I also think it's worth pointing out that Gen-Z having a 7% LGBTQ rate theoretically could also have an environmental cause. There is evidence of a biological basis for transexualism.)
As acceptance and awareness grow, the bar gets lower -- fifty years ago it'd take a lot of dysphoria to justify trying to transition; now it's still not simple but it's a lot easier, and so more people who are comparatively less dysphoric are willing to take that particular plunge, and more of them know it's a doable thing.
Did I play out too much as a pirate with an eyepatch?
Joke aside, the disease has many causes, and there is some genetic predisposition. It is too easy to blame it on the modern environment.