I don't think your eye trouble has much to do with your PC work/play.
If it did, I'd be blind.

It's more likely ON, which is a Side of MS.
Your slumping is due to your MS fatigue, nothing else like it.
Some PT exercise and stretching will help your body stay stronger
and straighter, but I have to do it daily, even if I don't feel like it.
If I don't use it I lose it.