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Sunglasses are not just a fashion item they also protect your eye lens from gradual damage from UV. It may be a good compromise in the end.

Protection over a life time of exposure, whereas if you avoid myopia by age 20 you're probably good for life

Didn’t quite work in my case.

And you are not alone. I know a lot of people who got myopia after 20.

How bad? My college (8 diopters) was jealous of my "mild" 4 diopters of correction.