Sheep eyeballs are considered a delicacy in quite a
few countries around the world.
In the countries of the Arabian Peninsula, whenever a sheep is
slaughtered for a feast, by tradition the eyeballs are served to
the guest of honor. The eyes are served raw,
with the hard cornea removed; the consistency is
like jelly and the recommended course of action is
to swallow them in one gulp.
In Mongolia, pickled sheep eyeballs in tomato juice
are a traditional hangover remedy.
Boiled sheep's head is a traditional Viking dish,
eaten to this to day in Norway and Iceland.
The eyeballs are eaten along with the rest of the head,
although as far as I know no special importance is
attached to them.