At $39.00 you could have a pair for early morning, late afternoon and another plain pair for the middle of the day.
The main point is though, the focal point of prescription glasses needs to be shifted from centre as you would normally look through glasses to be for a right eyed shooter to the left and upwards of centre to be exactly behind the Scope Exit Pupil centre. Then you will have much better focus. If the focal centre was not shifted then they aren't quite corrected properly.
Some Optometrists I believe offer the service at a shooting range so that it all gets done correctly, but I bet that comes at a much greater price.. I can tell you, it took me quite some time to get that Texta Dot in the correct position by myself at home sitting at my shooting bench.
I'm not complaining at all. They must have helped me in my last competition shoot to take out "best target score" and "smallest group" for the competition and I could actually see the bullet holes in that 1.182" 5 shot group at 550 yards. Oh, a March-X 8-80x56mm Scope helps a lot seeing little holes....