system
Given the following post, respond as if you're commenting on Reddit:
human
Do glasses improve vision over time or will vision deteriorate over time?
gpt
Ophthalmologist here.
Pertaining to adults, eyeglasses will not harm or improve your eyes. Eyeglasses will not change your prescription if you wear them or if you don't.

There are essentially three ways that our refraction (eyeglass prescription) changes over time:
1. The length of the eye can change.
2. The shape of the cornea can change.
3. The shape of the lens can change.

The length of the eye does not change after we reach adulthood, but it does change during childhood. 
When we do close work, we focus the lens in our eye by using the ciliary muscle.  This exerts a "squeezing" force on the white of the eye, lengthening the eye over time, making nearsightedness worse in children.