I was told that the correction lenses were only available in full dioptre increments.. which is irritating.
I have been myopic since the age of about 16/17 and, through my 20s and 30s, my prescription did not change at all (around -2.75)
Now, in my mid-40s, my eyesight is improving, to the level that I am now only -2.0
I am hoping that by the time I retire, I will be able to see properly again without any artificial aids
(The most likely thing to happen is that I will need reading glasses within the next 10 years, apparently, since if you are myopic, not only do ones eyes often get better as far as long distance is concerned, but the muscles ability to close-focus gets worse. This could be interesting since, IIRC, the eye has to be able to properly focus at around 1m in order to use a viewfinder properly. Perhaps someone could confirm?)