http://www.tcm.com/tcmdb/title/4779/Pap ... icles.html
…... Hoffman (=Dustin Hofman) had to wear special contact lenses to balance his vision, which was severely distorted by the Coke-bottle glasses his character was required to wear.
Dustin Hoffman had to wear contact lenses so that he could see correctly through the thick glasses he had to wear.
http://www.afi.com/members/catalog/Deta ... ovie=55041
…. Modern sources note that William Tuttle, Allan Snyder, Robert N. Norin and Monte Westmore were part of the makeup crew, and that Kent James served as a costumer.
Studio publicity related that due to the extremely thick lenses in the glasses he wore, Hoffman was obliged to wear specially made contact lenses to balance out the magnification and enable him to see.