Hi Buffeting...in regards to your first post of deteriorating eyesight, I experienced the same thing. Script would change by 0.25 dioptres every six months when I was in my teens. Opthalmologist said to keep seeing him every year....well..chasing jobs in the outback made that impossible. 10 years down the track, both eyes were still getting worse to about -5.00 then one retina detached and the other had many tears in it. I noticed flying home after an overnight that I had a "black" area in my field of vision. I saw that same opthalmologist and he got up me for not making yearly visits. Luckily I did get my licence back.
I'm not suggesting you're a candidate for this but DO keep up regular appointments with an opthalmologist. Although having just read your OTHER post, seems you've already seen one. If they've not said anything I assume you're not a candidate.