I don´t use glasses, gratefully, so I don´t understand much about this matter, but it is very important to always have your lenses with the right graduation.
150% and you still need to use glasses, that´s why our body is full of surprises, and the more we know it the less we understand it.
I didn't need them either when I was 21 :)
Ahaaha, you´re right, my opinion is a little suspicious considering my age.