Photophobia is the avoidance of light due
to pain. This may be caused by injury to the cornea — the
clear covering over the eye — or inflammation of the uveal
tract, which contains many structures important for your eye to
function properly. When exposed to light, your pupils constrict,
or become smaller. When there is swelling of any eye structure,
it may cause pain when your pupils are constricting.
Some chemotherapy drugs that have been linked to photophobia: