Rinse your eyes with cool water or put a cool compress on them. Take out your contact lenses if you wear them. It’s likely to go away on its own within a few days, but if the swelling lasts more ...

Our pets, such as dogs and cats, have a third eyelid called the nictitating membrane. This thin, moist membrane protects the eye, especially during sleep. The nictitating membrane, or third eyelid ...