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Tears
Lacrimation, or lachrymation, () is the secretion of tears, which often serves to clean and lubricate the eyes in response to an irritation of the eyes. Tears formed through crying are associated with strong internal emotions, such as sorrow, elation, emotion, awe or pleasure. Laughing or yawning may also lead to the production of tears.
==Physiology==
In humans, the tear film coating the eye, known as the precorneal film, has three distinct layers, from the most outer surface:
Having a thin tear film may prevent one's ability to wear contact lenses, as the amount of oxygen needed is higher than normal, and contact lenses stop oxygen from entering the eye. Eyes with thin tear film will dry out while wearing contact lenses. Special eye drops are available for contact lens wearers. Certain types of contact lenses are designed to let more oxygen through to the eye.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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