Before I put in my contact lens today, I could read the screen at either distance equally well. I've tried with one eye, the other eye and both. Isn't that splendid? My brain simply adjusts patiently and makes the best of things. And, after experimentation with a lens in (which I wear in my right eye), I find that my left eye does the reading, but the right eye helps out with focus as I get further away and gradually takes over as necessary. I still can't tell as it's happening though, it's all quite automatic.
I know that this would not work for me with glasses. Once, I took my glasses out of my bag to put them on to drive home after dinner with friends. As I put them on, my sight blurred and I thought I was getting a migraine. One of the lenses had dropped out into my bag - fortunately, I had a knife with a very small screwdriver and I was able to repair it, but I simply couldn't see normally with one lens of my glasses.
My in-laws had an elderly live-in housekeeper - she'd originally come as a general help, and nursemaid to the year-old Sprout and she stayed on for the best part of 50 years before retiring on the death of Ma. She had lost the sight in one eye, by the time I knew her, from a cataract. In those days you had to wait until it was thick and opaque before it could be operated on. By the time Hilda reached that level of sight loss, she said that she had got used to it and chose not to have an operation. She had one lens of her glasses obscured and managed with one eye. However, years later, when she was about 70, I suppose, she suffered a detached retina and lost the sight in her good eye. She took it in her stride, had the cataract removed from the other eye and simply switched useful eyes. I have no idea how she managed to do that, but she never even mentioned any problems.