LP32986-9
Cornea
Active
Descriptions
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eye's optical power. Together with the lens, the cornea refracts light and, as a result, helps the eye to focus. The cornea contributes more to the total refraction than the lens does, but, whereas the curvature of the lens can be adjusted to tune the focus, the curvature of the cornea is fixed. The cornea has unmyelinated nerve endings sensitive to touch, temperature and chemicals; a touch of the cornea causes an involuntary reflex to close the eyelid. Because transparency is of prime importance the cornea does not have blood vessels ; it receives nutrients via diffusion from the tear fluid at the outside and the aqueous humour at the inside and also from neurotrophins supplied by nerve fibres that innervate it. In humans, the cornea has a diameter of about 11.5 mm and a thickness of 0.5 mm - 0.6 mm in the center and 0.6 mm - 0.8 mm at the periphery. Copyright Text is available under the Creative Commons Attribution/Share-Alike License. See http://creativecommons.org/licenses/by-sa/3.0/ for details. Source: Wikipedia, Cornea (Wikipedia)
The transparent anterior portion of the fibrous coat of the eye consisting of five layers: stratified squamous CORNEAL EPITHELIUM; BOWMAN MEMBRANE; CORNEAL STROMA; DESCEMET MEMBRANE; and mesenchymal CORNEAL ENDOTHELIUM. It serves as the first refracting medium of the eye. It is structurally continuous with the SCLERA, avascular, receiving its nourishment by permeation through spaces between the lamellae, and is innervated by the ophthalmic division of the TRIGEMINAL NERVE via the ciliary nerves and those of the surrounding conjunctiva which together form plexuses. (Cline et al., Dictionary of Visual Science, 4th ed) Source: National Library of Medicine, MeSH 2006
Basic Part Properties
- Part Name
- Cornea
- Part Display Name
- Cornea
- Part Type
- System (Describes the name of the system (sample) type)
- Created On
- 2003-11-18
- Construct for LOINC Short Name
- Cornea
LOINC Terminology Service (API) using HL7® FHIR® Get Info
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Language Variants Get Info
| Tag | Language | Translation |
|---|---|---|
| es-ES | Spanish (Spain) | Cornea |
| ru-RU | Russian (Russian Federation) | Роговица |
| zh-CN | Chinese (China) | 角膜 Synonyms: 眼角膜 |
| it-IT | Italian (Italy) | Cornea |
| el-GR | Greek (Greece) | Κερατοειδής χιτώνας Synonyms: Κερατοειδής χιτώνας |
LOINC Copyright
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