My eyes get tired but it's understandable at my age, almost 85, and that I work on the computer for at least
six hours every day including weekends. My work as a writer-editor-proofreader for a very demanding book publisher is very exacting,
there is a lot of it, and my eyes and head get tired. Then I make typos at the computer keyboard and the stress fuels the tired eyes.
He sometimes emails me at 8 pm asking me to work on something he sounds like is urgent. I put it off until morning.
Everything is urgent to him. My health is more urgent to me.
The load of work is not easy to keep up with, but it beats having nothing to do. I just try to pace myself and also found some good eye exercises online.
They suggest blinking more often and looking away from the monitor every 20 minutes at anything about 20 feet away.
I also like Bates' and Schneider's suggestions, especially taking a break by cupping the hands over the eyes and seeing black.
I had some dizzy spells some months ago but just sat and rested my emotions and got over them. Deep breathing really helps.