Well, my eyesight correction is L -4.25 R -3.75 and about a diopter of asstigmatism chucked in for good measure. Had no worries getting a Class 1 medical. Renewal in March all I had to do was read a couple of lines off a chart, sweet no worries.
Only annoying thing about wearing glasses flying is when the arms of the glasses break the seal around my headset making it a little noisier.
Dan