Hrmm...
Well, can't say I got problems with my eyes as I've been video gaming for near on 2 decades and some change now. I got 20/12 in my right eye and 20/15 in my left when I had them checked. Of course nothing is static.
I will say gaming has helped with manual dexterity in my hands. That and the long hours of art work.
I will say I have major Flat Butt "syndrome." Aka Noassatall. Not sure if that is from gaming but growing up I always just sat on the floor when gaming.
I will say my posteur isn't the best but I've set on fixing that. It may be partly related to gaming but also because I have wierd joints. Every joint I have just about it loose or double jointed.
I've gained more weight in the last few years, but that could be from just age, drinking (most likely culprit), or lack of excercise (second most likely culprit). I'm not one for eating while gaming, or drinking caffine while gaming. I don't smoke either. If I'm really interested in a game, I can focus like nothing else and I don't need caffine to stay away at all. Seriously, gaming HAS helped my concentration and focus. However, since gaming can make the time pass by very quickly for me, I've had a few sleepless nights and hated work or school the next morning.
Now... computers in general... I got many battle wounds. Modding cases.. the scars are annoying but small for now.
I also like to read ebooks and THAT makes my eyes tired after awhile. Gaming doesn't but reading 300 pages of an ebook in a few hours can. I know it's not gaming related, but similar use of hardware related.