I qualified expert multiple times with glasses and very poor vision without them.
I had surgery a few years back. Changed everything. I regret not doing it sooner. However, having perfect uncorrected vision makes muscles in your eyes have to work different, and in a way I was not used to causing strain and headaches. My eye doctor gave me +0.5 readers. I couldn't tell the difference with or without them. He said "just trust me"...wouldnt ya know no eyestrain staring at a screen all day or reading all day anymore.
I wear +0.5 in my shooting glasses now too and can hold focus on the front sight post better and longer than before. Even if you don't need them, give some +0.5 or up to +1.0 safety glasses a try when shooting. I bet your performance is better! Glasses aren't just about "correcting". In fact, I have several pairs going up to +1.5. The longer the sight radius, the less power needed to help out.