Eye surgery - Anatomy of the eye

Cornea - On front of the eye there is a dome-shaped membrane called cornea. The cornea refracts the incoming light about twice as much as the lens or 2/3 of the total eye's refraction ability. If the cornea is irregular bend you have astigmatism. The cornea is half a millimetre thick and contains of five layers: Epithelium, the Bowman's membrane, stroma, descement's membrane and the endothelium.

Epithelium is the layer of cells that covers the cornea. The epithelium is only 5-6 cell's layer thick and recovers as soon the cornea is hurt. If deeper damage arises on the cornea, it can cause a scar.

Bowman's membrane lies just under the epithelium. It's very hard to penetrate. It protects the cornea against injures.

Stroman is the thickest of the layers and lies just under Bowman's membrane. It consists of small fibres of collagen which lays side to side to each other. This makes the cornea transparent.

Descenmet's membrane lies between stroma and endothelium. Endothelium is only one cell layer thick. The task of the endothelium is to pump away water to make the cornea clear. Endothelium will not be recovered if it will be damaged of some decease or exposed to physical damage.

Because there are no blood veins in the cornea, it's normal clear and has a shiny surface. The cornea is extremely sensible. There are more nerve-threads in the cornea than elsewhere in the body.


Eye surgery			Cornea Cornea - On front of the eye there is a dome-shaped membrane called cornea. The cornea refracts the incoming light about twice as much as the lens or 2/3 of the total eye's refraction ability. If the cornea is irregular bend you have astigmatism. The cornea is half a millimetre thick and contains of five layers: Epithelium, the Bowman's membrane, stroma, descement's membrane and the endothelium. Epithelium is the layer of cells that covers the cornea. The epithelium is only 5-6 cell's layer thick and recovers as soon the cornea is hurt. If deeper damage arises on the cornea, it can cause a scar. Bowman's membrane lies just under the epithelium. It's very hard to penetrate. It protects the cornea against injures. Stroman is the thickest of the layers and lies just under Bowman's membrane. It consists of small fibres of collagen which lays side to side to each other. This makes the cornea transparent. Descenmet's membrane lies between stroma and endothelium. Endothelium is only one cell layer thick. The task of the endothelium is to pump away water to make the cornea clear. Endothelium will not be recovered if it will be damaged of some decease or exposed to physical damage. Because there are no blood veins in the cornea, it's normal clear and has a shiny surface. The cornea is extremely sensible. There are more nerve-threads in the cornea than elsewhere in the body.
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