Hello mrsmop,
Thank you for your reply.
Yes, I do spend a lot of time in front of my laptop doing projects and researches, but I don't forget to take small breaks as well.
---
The last time I visited local Optician was a year ago. I had an irregular check up process, e.g. with a designed for eye examination devices (pressure, clarity of the picture, retina check up and etc). It turned out my left eye has a micro scar causing my eyes to see things with a slight difference in terms of a far sigth properties. As a wrap-up result, the doctor said there was no big changes since the previous visit which was about 2 years ago (e.g. in ~2013, or even earlier, I cannot recall the exact date, could be way back even in 2011). He also pointed me out that my eyes were good to go for the LASIK operation if I wanted to.
---
I recently had my laptop broken and I was unable to use it for almost two weeks (so as in a result I had a lot more resting for my eyes). Yet, before there was no such issue as double image, my eyes were capable of handling long hours of working in front of a screen, especially during uni time (I am a recent IT graduate).
It is still unhealthy to be spending many hours watching screens, yet, the first time I felt odd things happening to my eyes were exactly after recent uses of the phone while laying on my bed.
I was using phone during the time I was unable to use the laptop, but I would spend only hour or two. Only recently, even already having laptop matter resolved, I still used phone for a comfort internet surfing while being on bed. As a consequence, I've started to notice some disturbing changes as to how I see in far after using phone on bed in laying position.
I constantly wear glasses, and I have two kinds of them: weak (older) ones and stronger (newer). I use my old glasses when I work with laptop, as my eyes considerably get tired much less than when if I was using my newer ones. Whenever I would go out, I would wear the newer ones as to perceive the world better while outdoors. And as for the time when I would use the phone for hour or two, I would take my glasses off.
Somehow I felt that by giving my eyes some rest, they have gone much rested. At the same time, they are not much ready for a heavy load as before. It forces me to be careful with timings now and I take breaks a lot more freuqent now, especially from using the phone.
One of the other observations I made is that, I felt my eyes to be less resistant to changes when I wear no glasses and lay on bed and watch the phone's screen. After ~30 minutes on average, I would start feeling as if my eyes adapted to a new position and they feel no pressure, e.g. relaxed (goes for eye muscles). It even makes me intuitively feel as if during such time I can easily get adapted to a squint with them (which is true on other hand, after all the position I was choosing for when using the phone, was irregular..makes a good point to avoid such in the future). It also made me to have an impression that if I don't keep my eyes loaded with pressure they'll go into irregularity state of their health condition. It sounds odd, as when I wear no glasses my eyes should actually feel better, yet this concern lets me think I should be careful when letting my eyes rest or what position I choose when I work with screens.
---
I considder paying a visit to the doctor, yet, to keep it under control meanwhile, I resorted myself to this forum for advices in regards with eye exercises and perhaps some eye-cleansing drops, as the visit to an optician is not available for me in near several days.