Controlling BG and Improved Vision
I have had severe myopia since 8 years old. Had LASIK in 1990. Ever since my vision has been variable - sometimes sharp and sometimes not. My docs said it was caused by variable hydration. It is true that a big glass of water would sometimes help my vision but it did not eliminate the problem. Since I have been controlling my BG spikes by restricting carbs, my vision has improved dramatically. I have found that I can not eat more than 10-15 grams of carbs without having my 1 hour postprandial BG go above 140. Reflecting back on my pre-PB diet, I'm guessing my 1 hour postprandial BG's must have typically been well over 200 and, considering my high carb snacking pattern, my BG probably stayed around 200 for most of the day.
I've come across anecdotal reports of this too. I might try looking for a pattern in myself.