Q: I just discovered that I’m diabetic and to my pleasant surprise it seems like my eyesight has improved a lot, even though my blood sugar is still out of control with my treatment. But isn’t this great? A: An unpredictable change in focus sometimes happens with your condition and it’s not necessarily good – sorry to rain on the parade! This is just one of many ways that diabetes can affect your eyes and you’ll definitely need to have periodic professional assessments.