My eyesight was pretty bad even before I started staring at screens. But mine is due to genetics, probably.

I got a Lasik(actually PRK) procedure a couple of years ago and I am glasses-free since then with the occasional dry eye.

From what I understood, anything that causes eye strain is not a good thing. But it's not only screens(reading, bad lighting...). So things like taking frequent breaks and making sure that your eyes are hydrated will benefit you. Anything else is highly controversial at this point in time.