VA is visual acuity which is a fancy way of saying eyesight. Do you wear glasses?
I'm supposed to but don't wear them very often. I didn't know it had a technical name.
Yeah so VA is dependent on optical and neural factors. You should wear your glasses!
I know I should. So it's basically a team working together for people to be able to see?
Yeah basically! When they don't work well it's called ametropia, which is refractive error. That is how the light is refracted in the eyeball.
Oh ok, that's interesting! What else do you know about eyesight?
I know a lot! Like for example, refractive errors are caused by a lot of things like the shape of an eyeball, or the shape of a cornea. Even reduced flexibility of the lens in your eye.
Is there a way to strengthen eyesight without glasses? Like exercises or something?
Well not exactly, vision impairment can be caused by your vision net developing properly in early childhood.