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This is Dr. David
if he has one dilated pupil, this can be serious and can be due to nerves in his brain not functioning properly
he should see a doctor and get an MRI scan of the brain right away.
this can check for pressure on nerves in his brain
an irritated eye can be from an eye infection like conjuctivitis which can be from viral or bacterial infection
is he willing to see a doctor and get his eyes checked?