(dated, fandom slang, humorous) Imaginary marks left by looking at things, especially by reading books.
1952, Arthur Rapp, Lee Hoffman, Redd Boggs, Fanspeak, page 5:
When you read a new book you get eyetracks all over it. Then it isn't mint any more.
1955, Joe Haldeman, “Try calling on the World for peace of mind”, in Worlds, page 150:
"You look good in that," he said. "Especially wet." I'd noticed the difference. "Feel like an ad for a Broadway parlor. I'll be scraping off eyetracks all night."
1959, Terry Carr, Ron Ellik (as Carl Brandon), “Readerville”, in The BNF of Iz, archived from the originalon21July 2013: