Hi everyone -- this is my first forum post. First, I guess I'll provide some background information so you have some idea of where I'm coming from.
I've been near-sighted since I was about 10 years old, and wearing glasses (at least some of the time...in recent years, I rarely wore them to use the computer or read, which now I'm quite thankful for). My eye prescription, last time I had checked, was -3 (left eye), and _2.25 (right eye). Last March (2013), I stumbled upon Todd's excellent post on improving vision. Shortly thereafter, I stopped wearing my minus lenses, and bought some reading glasses to use for reading and computer work. At first I started with +2 (right eye)/+1 (left eye), and then as I started to see improvement, gradually started increasing the power of the plus lenses. I also printed out a Snellen chart and started testing myself regularly. I believe I could read the 20/70 or maybe 20/60 line when i started, in good lighting.
As of this point, I've been very happy with my progress. In bright light (when some direct sunlight is coming into the room with the Snellen, though not directly onto it), I can now read the 20/20 line. Now, when I read (at a distance of perhaps 12-15 inches), I'm using glasses with power +3 (left)/+4 (right). My sincere thanks to Todd for providing this life-changing information free to all.
However, it seems that I could still stand to make more progress. On dim days (say, an overcast winter day), that same Snellen is only readable to maybe the 20/40 line, and that just barely. (If I try with my old prescription minus lenses, even in poor light, I can clear the 20/20 line.) Night-time vision is even worse, maybe 20/50 or even a bit less.
My question is, has anyone managed to achieve nearly perfect dim lighting/night-time vision? Is this possible? And what diopter rating for the plus lenses did you end up using (for reading, in decent/good light) in order to achieve this? I would speculate that perhaps if I could read close-up text using +6 lenses, then I might achieve 20/20 night-time vision....but that's just a guess, really.
Thanks and I look forward to hearing others' thoughts.