Other than picking a course that isn't into the sun, or choosing a better
time to fly, is there any cure for the sun in the eyes problem?

I carry slap-on vinyl sun shades.
Stick em where you want em.
One lets too much sun through, slap another over top of it.
AOPA gives them out free at the big shows.
Carry them in your flight bag.

"Don't leave home without them!"