Do Caterpillars need glasses?

"Monarch larvae, like other caterpillars, have very poor vision. They see through six pairs of simple eyes, called ocelli."  http://www.mbsf.org/facts.html 
You can also go to this site to see a great picture of the eyes:  http://www.butterflyfunfacts.com/caterpillareyes.php
This guy put his head up as if to see what I was up to.  I thanked him for posing so nicely.