I was diagnosed with non surgical antimetropia at 40 yo. i am 54 now and still mostly do not wear glasses. are there any known causes? how rare is it

Rare. Less than 1/16: You have a rare form of anisometropia, where there is difference of more than 2 diopters (power) between the eyes. Only 1 in 16 people have anisometropia, but usually both eyes are nearsighted or farsighted (not 1 eye of each). The only known treatment that I know is refractive correction - glasses + contacts (in one eye) or glasses + lens surgery (in 1 or both eyes). It usually develops as child