Call the clinic if you have eye pain, a red eye that is getting worse, sensitivity to light, discharge, or a feeling that something is stuck under your eyelid. A sudden change in vision, new floaters, or flashes of light also deserve prompt attention. If you wear contacts, take them out before calling.
Some situations need emergency services immediately. For a chemical splash, a penetrating injury, severe trauma, or sudden vision loss along with stroke-like symptoms such as weakness or slurred speech, call 911 or go to the nearest hospital emergency department. Rinse a chemical splash with clean water while you get help.