There is a physical problem, please ask everyone, thank you!

Myopic people's eyeballs will bulge outward because of lens deformation.

The pool is equivalent to a concave lens protruding near the eyeball. If the refractive index is similar to the nearsighted glasses he wears, he will see clearly. At this point, the pool is equivalent to myopia glasses.

In addition, if nearsighted people shed tears, they can see clearly without glasses.