text: my husbands left eye always looks red but not the right eye. what causes this?   does your husband suffer with allergies?  it could be a reaction to something he came in contact with.  does he rub the eye a good bit?  it may be caused by something he was working with and by rubbing his eye he may have accidentally rubbed something in it.  does his eye burn or water at all?  if his eye problem does not go away in the next day, tell him he should see a eye doctor.  it could be more serious than allergies.  eye sight is a precious gift we all have.  if the problem persists, he should get it looked at and taken care of asap.  good luck!