During the period from august 2013 to november 2014 I was a neet spending a lot of time playing an MMO. I used to be able to look at a computer screen without glasses, even if I had glasses for nearsightedness to use at longer ranges. At this time I didn't watch tv, whatever I wanted to wathc I just watched on my computer, at a close distance. Sometime during this period I started using my glasses more, until I had them all the time in front of the computer. I didn't think at lot of it.
One day I visited a relative and they had the tv on. I couldn't watch at tv viewing distance without glasses for a long time, so I put my glasses on. This gave me a bit of a shock. With these glasses I used to have crystal clear vision, but now I could barely read the text on the tv! It was obvious to me that spending all this time looking at a computer screen while wearing glasses had made my eyesight significantly worse, in just 18 months.
I decided to stop wearing glasses unless I really needed to, and I dug up an old pair with weaker lenses I had used in my teens to use at the screen to try and gradually improve my vision again.
I also did some research and read some PDF:s on the topic, one of which was was Huxley's "art of seeing."
I decided to look into Bates method
http://www.seeing.org/
and picked out two exercises
the long swing
palming
I have now done these exercises daily since around mid 2015, used weaker glasses for screen and no glasses at all for reading books. I also got an e-ink reader for epub/pdf since those are said to be more natural for the eye than a LED screen.
At first I didn't notice any real difference, maybe a little bit of different perception of eyesight directly after the exercises. After about 6 months I could read the digits of the scale I used at work again, without wearing glasses.
I also noticed that on days where I had worn my glasses for longer periods, my nearsightedness was worse in the evening than on days when I had not worn glasses.
This to me confirmed that Bates really is onto something with his claims that glasses may be the cause of worsening nearsightedness over time.
I remembered hearing somewhere that taking walks in the dark at least 3x20 min every week would increase night vision and long distance sharpness, so I did this too.
Now after 2,5 years of actively trying to improve my eyesight, I'm back at the point I was in 2013, before my neet period of glasses and screen abuse. It's not a quick recovery, but it does have an effect.
TL:DR
Bates method works, but it takes effort and time.