By rescuing the third spy.
you can get glasses in spy island, it is found in the shop which has glasses and a mustash on it.
Go customize the agents on spy Island
the glasse are right underneath the treehouse to the left
Get the thermal glasses and you will see him in the vents
you need a kind of glasses.
The brown guy with the glasses is the suspicious guy that tells you to protect the painting but he is the one who steals it!
There are some odd green glasses worn by Sir Rebral on Super Power Island, which are similar to the Ultra-Vision Goggles on Spy Island, which have the twisted look.
You get them from up from the roof in spy island but you need to have the special tie to get up there first
Before the introduction of Spy island, they were located as special items. Now you can get a pair at Spyglass Eyewear on Spy Island.
There are numerous type of glasses to copy with the Costumizer. The "green swirly glasses" are the Ultra Vision Goggles obtained on Spy Island. (see related link) Green glasses without the swirls can be copied from Sir Rebral on Super Power island.
if you are in spy island on poptropica the answer is if you go to the glasses place and take an eye exam the the things shaped like this are the symbols E M W 3
in what poptropica world if your talking about Spy Island I could help you on that.