I'm 17 this year and I first wore spec when I was 8.
8, 9,10, 11, 12, 13, 14, 15, 16, 17.
Spec doesn't necessay need to be changed every year, I used to wear
R-eye 425, L-eye 275, when my degree had gone up to R-eye 500 and
L-eye 375 from pri 4 to sec 3/4 until the optician scolded me for
wearing spec that does not fit me... now degree increase to R-eye
600, L-eye still the same. Got increase anymore I don't know since
no school no need to check eyesight liao.