why is our eye always kept in moist condition by the vitreous humour in our eye?
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Answers
Explanation:
The bony structures of the orbit (the bony cavity that contains the eyeball and its muscles, nerves, and blood vessels, as well as the structures that produce and drain tears) protrude beyond the surface of the eye. They protect the eye while allowing it to move freely in a wide arc.
The eyelashes are short, tough hairs that grow from the edge of the eyelid. The upper lashes are longer than the lower lashes and turn upward. The lower lashes turn downward. Eyelashes keep insects and foreign particles away from the eye by acting as a physical barrier and by causing the person to blink reflexively at the slightest sensation or provocation.
The upper and lower eyelids are thin flaps of skin and muscle that can cover the eye. They reflexively close quickly (blink) to form a mechanical barrier that protects the eye from foreign objects, wind, dust, insects, and very bright light. This reflex is triggered by the sight of an approaching object, the touch of an object on the surface of the eye, or the eyelashes being exposed to wind or small particles such as dust or insects.
On the moist back surface of the eyelid, the conjunctiva loops around to cover the front surface of the eyeball, right up to the edge of the cornea. The conjunctiva protects the sensitive tissues underneath it.