Never heard of it. You should ask Jan. If you don't know who that is yet, I'll tell you. She's the adult on this page and has a lot of experiance. I wouldn't be worried about eye goobers, I've never seen theem on rats except Jan's Casper, but he's old and sick. (No offense to you, Casper) My dog gets eye goobers all the time, and she's been healthy, is healthy and will always be healthy. So, harmless eye goobers should be teh same with rats, right? ~Jessica~