The problem is your eyes not the hardware. Go to the dollar store and get a couple pair of cheep reading glasses is various strengths. Note that many people need different corrections right and left. Once you determine which lens works best for each eye order a set of glasses from an online prescription glasses place. Be sure to get the anti-reflective coating.
Modding your new toy to is a bad idea.
The warning label for the batteries says 100 °C. I bet the glue is hot melt and it turns to butter at some temperature well below that. Apple offers battery replacement service so there has to be some reliable way to un-bond the glue.
I bet at about medium well (160 °F or 71 °C) the batteries fall right out.