The lens inside the human eye works like a camera lens. It is located behind the pupil and its function is to focus incident light rays onto the retina.
To function properly the eye also depends on the position and working of the eyelids. The eyelids are also very important for a person’s appearance.
TEAR DUCT SURGERY
There are a number of causes for the over-production of tears. An eye may produce too many tears if it is irritated by, for example, an allergy, an abrasive foreign object or by an infection.