Honestly if shes seeing 20/20 20/25 I don't see why they are correcting her vision. I've have horrible vision and have had glasses since I was a kid. It doesnt make sense to correct perfect vision to strengthen one eye. She could use an eye patch on the stronger eye to make the other eye work harder.
I'm mobile.... sorry for the typos!
Amanda- wife to DH. Mama to W (2010), L (2011), H (2013) & expecting #4 Jan 2016