Please consider that these are preowned items, they are not perfect and are priced accordingly. You must expect some flaws and imperfections. If you are very meticulous about your sunglasses and eyewear, preowned items may not be a good idea.
I rate the frame and the lenses as : near mint, excellent, very good or good condition.
Near mint condition: These look new, you must look closely to find flaws.
Excellent condition : Very light usage marks on the frame or lenses. They do not affect vision.
Very good condition : Some usage marks, nothing serious. Lenses will have some light scratches that do not affect vision in a significant way. Meticulous owners will probably want to change the lenses.
Good condition : Obvious usage marks on the frame but nothing is broken. Lenses are scratched but are usable. Meticulous owners will probably not be happy with these.