What's so funny?  Maybe the clear substance called the "vitreous" this that occupies about 80% of the eyeball
Maybe the clear substance called the "vitreous" 
this that occupies about 80% of the eyeball  A MEATY CATEGORY: Don't be... [DOC] [TLE] Ask an Ophthalmologist: Bringing Your Eye Questions Into Focus ... [PAR] Mar 11, 2016 ... Ophthalmologists Lisa Park and Anne Sumers bring your eye ... fingers together 
so they touch, and then rest your thumbs one on top of the other.