I have monofixation syndrome without amblyopia, discovered only after age 40 when an ophthalmologist who actually knew what they were doing did their job. My understanding is there no durable or neuroplastic adaptation to double vision, amblyopia, or monofixation syndrome after youth because it is permanently wired that way in the ocular-vestibular systems. Corrective eyewear, eye surgery, and/or weaker eye training at early ages may help, but show no evidence of correction in later years. Monofixation syndrome is a neurological adaptation of the brain to minimize the experience of double vision.

I have double vision from strabismus. There are quite a number of eye therapy exercises that you can do to improve the condition. The older you get, the more of it that it takes. I have made improvements, but before I made this discovery and started the therapy I was too far gone and too old to fully cure. But... I can get decent life improvements if I put in the effort.

If you look hard enough you may find an optometrist that specializes in eye therapy for strabismus and similar vision issues. Expect to be the only adult in the waiting room that is not a parent, most patients will be early-grade-school-age kids.

What helps me is:

1. Taking breaks more often. 2. Using bigger monitor with bigger fonts, so I could sit further away. 3. Using Apple Vision Pro as a monitor replacement as it gives you 4-5 feet focal distance.

The last one lets me work at my computer all day without getting double vision, but it's not very comfortable and you start to feel the weight after 2 hours or less. Plus the friction on putting it on, connecting, etc.

The 20-20-20 rule[1] can help with diplopia from computer vision syndrome.

Although I would advise to reduce screen time rather than treat just the symptoms that arise because of it.

  [1] https://wiki.endmyopia.org/wiki/20-20-20_rule
  [2] https://en.wikipedia.org/wiki/Computer_vision_syndrome

I only ever heard about seeing double after some sort of accident. Do you know what causes yours? The sibling comments seem to assume it is from looking at screens for too long, is that it or does that make it worse?

Double vision ? Is this when one sees with both eyes simultaneously ? =)