Same here. My eye doc told me its because I'm getting old. Not really but he said that deterioration starts at 40. Apparently, he wasn't kidding. My eyesight is going downhill fast.
I've been staring at computer screens for 20 years. My vision only recently started going bad and only after I crossed 40. I'm not sure computer screens have anything to do with it but that's just an opinion based on my own experience.
I think the key to working on computers a lot is to not have the monitor up against a wall - i.e., have some distant objects in the background right behind it and look away and focus on those objects frequently. If your computer screen has to be against a wall, put a mirror on your desk, aim it at something interesting that' s a long way off and focus on it frequently.
I don't see why computer screens are any more detrimental than reading a lot. I think the key is to vary the distance at which your eyes are focused a lot. Again, personal opinion.
But it seemsthat our eyesight goes bad at 40 no matter what we do or don't do.
