Closing one eye while reading?

Over the last year I've noticed that I will sometimes close my left eye if I stare at my phone too long, aka overdoing the OGing. I did get a blowout fracture with substantial tissue damage (still won!) about twelve years ago, they weren't sure if I'd regain full use. Anyways, I covered my good eye and used only the injured one until I fully recovered. It's never really bothered me aside from not being able to look all the way up so I'm not sure if it's related. Any optometrists on the OG? Phone Post 3.0