(redirected from corneal)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.


see eyeeye,
organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation. Other types of eye are the simple eye, found in many invertebrates, and the compound eye, found in insects and many other
..... Click the link for more information.



the anterior transparent part of the outer tunic of the eye that is part of the eye’s light-refracting apparatus and protects the eye from injury and dust.

There are five layers in the cornea: the anterior epithelium, the anterior limiting membrane (Bowman’s membrane), the substantia propria (connective-tissue stroma), the posterior, or Descemet’s, membrane, and the endothelium of the anterior chamber. Corneal epithelium is multilayered—in man it is composed of eight to ten layers with a total thickness reaching 50 micrometers. It is lined with Bowman’s membrane, which is an acellular part of the postepithelial stroma consisting of a network of collagenous fibers that run in various directions parallel to the surface of the cornea.

A membrane without a distinct boundary becomes the substantia propria of the cornea. In man the substantia propria occupies as much as 90 percent of the entire thickness of the cornea. It is solidly packed with collagenous fibers that are produced by fibroblasts; the intercellular matter of this layer contains mucopolysaccharides, chondroitin sulfate, chondroitin, and keratosulfate. The transparency of the cornea depends on the degree of dehydration and orderliness of the molecules of the acellular portion of the cornea’s basic matter.

Descemet’s membrane lines the basic matter of the cornea and is tough and elastic; its posterior surface is covered by the single-layered endothelium of the anterior chamber of the eye.

There are no blood vessels in corneal tissues. In man the cornea is innervated by 70–80 radial nerve trunks that originate in the optical branch of the fifth pair of cranial nerves; the branching of the trunks penetrates the entire thickness of the cornea, except Descemet’s membrane and the endothelium.

The most common diseases of the cornea include traumas, blennorrhea, keratitis, and staphyloma.



The transparent anterior portion of the outer coat of the vertebrate eye covering the iris and the pupil.
(invertebrate zoology)
The outer transparent portion of each ommatidium of a compound eye.


the convex transparent membrane that forms the anterior covering of the eyeball and is continuous with the sclera
References in periodicals archive ?
Results: For right eye the mean central corneal thickness measured by the Galilei dual Scheimpflug analyzer and Ultrasound pachymetry was 544.
Mean corneal endothelial cell density (CED) of diabetic population was 2494.
The streptozotocin (STZ)-induced C57/BL6 diabetic mice model was adopted in this study, and the corneal epithelium scraping method was used to build the repairing model for corneal epithelium and intraepithelial nerve injury.
A 26-year-old, female hyacinth macaw (Anodorhynchus hyacinthinus) from the Oklahoma City Zoo (Oklahoma City, OK, USA) was presented for ophthalmologic examination after a 5-week history of a nonhealing corneal ulcer of the right eye.
Keywords: Amniotic graft, Corneal ulcers, Ocular surface disorders, Re-epithelialisation, Pterygium.
Patients should consult their ophthalmologist to determine if corneal cross-linking is right for them.
Eye Clinic London is private ophthalmology clinic that specialises in corneal diseases and surgery, stem cell and corneal transplantation, refractive surgery on the cornea and lens, and cataract surgery.
A seven year old buffalo was presented with complaint of corneal laceration.
The Ocular Response Analyzer (ORA; Reichert Ophthalmic Instruments, Depew, NY, USA) is a non-invasive instrument that assesses the corneal biomechanical properties corneal hysteresis (CH) and corneal resistance factor (CRF).
The aim of this article is discuss PTK, its therapeutic indications and benefits in treating superficial corneal pathology.
Our research shows that cells derived from corneal stem cells are attractive candidates for generating corneal cells in the laboratory," said Alexander Ljubimov, principal investigator on the study.