The remedy and solution for terrible eye pain and eye strain (from excessive computer use)

Why does the eye pain so much when it is dry?

Well, here's the answer:

The transparency of the cornea is due to the fact that it contains hardly any cells and no blood vessels.  However, blood vessels can creep in from around it, if it is constantly irritated or infected, which can interfere with vision. On the other hand, the cornea contains the highest concentration of nerve fibers of any body structure, making it extremely sensitive to pain.  The nerve fibers enter on the margins of the cornea and radiate toward the center.  These fibers are associated with numerous pain receptors that have a very low threshold.  Cold receptors also are abundant in the cornea, although heat and touch receptors seem to be lacking. [Source]

and from another source, this info

The cornea is one of the most sensitive tissues of the body, as it is densely innervated with sensory nerve fibres via the ophthalmic divisionof the trigeminal nerve by way of 70–80 long ciliary nerves and short ciliary nerves. The ciliary nerves run under the endothelium and exit the eye through holes in the sclera apart from the optic nerve (which transmits only optic signals).[8]

The nerves enter the cornea via three levels; scleral, episcleral and conjunctival. Most of the bundles give rise by subdivision to a network in the stroma, from which fibres supply the different regions. The three networks are midstromal, subepithelial/Bowman's layer, and epithelium. The receptive fields of each nerve ending are very large, and may overlap.
Corneal nerves of the subepithelial layer terminate near superficial epithelial layer of the cornea in a logarithmic spiral pattern.[11] The density of epithelial nerves decreases with age, especially after the seventh decade.[12]
The long ciliary nerves provide sensory innervation to the eyeball, including the cornea. In addition, they contain sympathetic fibers from the superior cervical ganglion to the dilator pupillæ muscle. The sympathetic fibers to the dilator pupillae muscle mainly travel in thenasociliary nerve but there are also sympathetic fibers in the short ciliary nerves that pass through the ciliary ganglion without forming synapses.


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