One of the most difficult parts about blindness is all of the unseen “enemies'' that seem to lurk around every corner.

I bump into or trip over objects that I didn't know were there, jump ten feet in the air when someone starts speaking in a room that I thought was vacant, or flinch when something brushes my arm and I have no way to figure out what it was. The unseen can be frightening!

In reality, however, all of us sighted or blind, encounter unseen enemies that are far more sinister.