Pain is a general term that describes uncomfortable sensations in the body, ranging from annoying to debilitating. Pain stems from activation of the nervous system and is highly subjective.
If the eyes produce too many tears, the tear ducts become overwhelmed and the eyes become watery. Watery eyes can be caused by strong emotions or laughter, weather, or a range of different conditions.
Photophobia, or light sensitivity, is when bright lights hurt your eyes. It can be associated with a number of conditions, ranging from minor to very serious.