Comment by walterbell

> defeatist attitude of "slowing myopia progression"

The global optical business is on the order of $100B in annual revenue.

Reversing or preventing myopia has less economic support, but research continues.

> it's not very much relevant whether it's -2 or -6

Smaller corrections can use CR-39 or even glass, with high optical quality. Lenses for larger myopia corrections become too thick with CR-39 material, requiring "high index" plastics. These have more cost and optical distortion. Smaller corrections are also more amenable to contact lenses.