How to use cornea in a sentence

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Sentence Examples Radial keratotomy, which involves making deep incisions in the cornea, is rarely performed today. If acetone is splashed in the eyes, irritation or damage to the cornea will result. From the 1940s to the 1970s, different techniques in keratomileusis evolved in surgical alteration of the cornea. The constriction of the skin rotates the eyelashes progressively closer to the cornea. The cornea and lens refract the incoming light rays to focus them on the retina at the back of the eye. The surgery involves lifting a small flap of corneal tissue and lasering onto the deeper cornea beneath. The irregular shape of the cornea distorts the image causing it to blur, unlike in a lazy eye where the eye is essentially normal. The surgery uses a cool laser beam to reshape the cornea and correct a person's vision. And for vision it is also necessary that there should be visual purple behind the retina and an opaque cornea and iris. His dissection of the eye yielded the distinction between cornea, retina, iris, and chorioid coat. The dioptric system includes the cornea, the lens, the aqueous humor within the anterior eye chamber, and the vitreous body. External examination includes a penlight evaluation of the lids, conjunctiva, sclera, cornea, and iris. The central portion of the bulbar conjunctiva is continuous at the limbus with the anterior epithelium of the cornea. The limbus is the thin area that connects the cornea and the sclera, the white part of the eye. Other examples of dense regular connective tissue include most ligaments, aponeuroses, and the cornea of the eye. The iris is an internal organ of the eye that is located behind the cornea and the aqueous humor. The anterior chamber is located behind the cornea and in front of the iris and is filled with approximately 0.2 mL of aqueous humor. We know that when eyes are shut, oxygen can reach the cornea from the iris solely by way of the stagnant aqueous humor. The cornea and aqueous humor absorb a high percentage of the UVA and UVB incident upon the eye surface. Immediately behind the cornea is the anterior chamber, filled with fluid called aqueous humour. Show More Sentences Eye patching, a common treatment, is thought to be helpful because it prevents rubbing of the eyelid over the cornea. The eye's optical system consists primarily of the cornea and the lens, and the corneal surfaces are aspheric. The surfaces of the lens or cornea may not be smooth, causing an aberration that results in a streak of distortion called astigmatism. Keratoconus is an irregular bulge of the cornea, or the clear surface structure over the eye. The remaining chapters include discussions of tumors of the orbit, eyelid, conjunctiva, cornea and sclera, uvea, and optic nerve. At the external border between the cornea and the sclera is the external scleral sulcus depression. Apart from the retinal area in the eye, the other areas that can be damaged by selective absorption of laser energy are the cornea and lens. This means that light rays travel to the back of the retina before they have been bent by the cornea and lens. When the eye creates an image the cornea and lens bend incoming light rays to focus them on the retina. Old types of corneal prostheses required a full trephination of the cornea. Part of the cornea is surgically removed and the cornea is reshaped to eliminate the need for glasses for nearsighted patients. Most ocular complications involve the cornea but may also include the conjunctiva, uvea, sclera, retina, and surrounding structures. Symone said she was quite gifted at the age of four, but she had a cornea transplant and wore glasses. The hospital does not levy any charge for the donor cornea but charges a very nominal cost only for the surgical procedure. The cornea, the pupillary opening within the iris, the lens, and the aqueous and vitreous humor combine to form the refractive media of the eye. An incision was made through the cornea and ultrasound used to break up the cataract. Reshaping the cornea with contact lenses to improve vision isn't new. Orthokeratology has been practiced by some eye doctors for decades. The practice of reshaping the cornea with rigid contact lenses is called orthokeratology. There are widely known homotransplants for layer-by-layer keratoplasty in the form of fresh and preserved cornea. The sutures that hold the surgical incision together alter the surface shape of the cornea or the clear surface of the eye. Show More Sentences The surgical procedure is similar for hyperopic patients, although the surgical technique varies to accommodate the flatter cornea. The cornea and lens of the eye ensure that the light rays are focused on the rods and cones of the retina. In some types the internal linings of the body can be affected, as well as the cornea of the eye. The diameter of the contact lens with respect to the diameter of the cornea is looked at as well. Light enters the human eye via the transparent cornea, the eye's front window, which acts as a powerful convex lens. The iridocorneal angle usually is a wide angle, is formed by the iris and the cornea, and encircles the anterior chamber. The cornea is the clear part of the outer layer of the eye that covers the iris and the pupil. The colored circular membrane in the eye just behind the cornea is called the iris. The fluid made by the ciliary body inside the eye nourishes the lens and, cornea and the colored iris. Soft hydrophilic contact lenses, made of flexible plastic are larger and cover the entire cornea. The spectacles seemed to protect her cornea and retina, which were not damaged. The cornea, iris, and crystalline lens work together to focus light onto the retina. The iris is the colored part of the eye, which lies behind the transparent cornea. Oxygen deprivation causes tiny blood vessels to grow into the clear tissue of your cornea. To see well, all layers of the cornea must be free of any cloudy or opaque areas. The whole eye is not used, only the cornea, the transparent front of the eye, and the sclera, the white part of the eye. These rays of light first travel through the transparent cornea, and then through the lens, which helps to focus the light. A cornea transplant replaces the damaged cornea with a disc of healthy tissue from a donor. The cornea is kept transparent by the continuous removal of fluid by the endothelial cells. However, cystine crystals in the cornea are not usually detectable in the first year. Show More Sentences Your doctor uses this light to examine the cornea, iris, lens and anterior chamber of your eye. Your cornea is transparent, allowing light to pass through much like clear glass. The top layer of the cornea is not damaged by the procedure, so there is unlikely to be any pain afterwards. Herein, we report the presence of collagen-rich crystalloids in the scarred, vascularized cornea of a 56-year-old woman. The refractive or focusing power of the cornea can be measured with a keratometer. The main ocular determinants of refraction are the focusing power of the cornea and crystalline lens and the length of the eye. Long-sightedness occurs when the eyeball is too short in relation to the focusing power of the cornea and lens. While the long-term effects of nightly cornea pressing are unknown, the lenses are considered to be safe. For those who might be stimulated by this letter to try gentian violet for impetigo, the agent must be kept away from the cornea. Untreated inflammation can result in cataracts, calcium deposition in the cornea, glaucoma and, ultimately, blindness. The cornea is hazy because of oedema, and the pupil is semidilated and fixed to light. The endothelium is a layer of cells that line the undersurface of the cornea and are essential to keeping the cornea clear. It is, however, susceptible to entropion, an eye disease which can cause blindness as the lashes penetrate the cornea. The excimer laser emits an ultraviolet beam that has sufficient energy to break intermolecular bonds within the cornea. In this work the role of the eye cup in the maintenance of the lens-forming capacity of the cornea and pericorneal epidermis was studied. Unlike the Draize test which focuses on the cornea, the Bovine lens test focuses on how the irritants affect the lens of the eye. Adhesions may also develop between the iris and cornea, covering up the trabecular drainage meshwork. Vitamin B2, or riboflavin, alleviates eye fatigue by helping to regulate blood flow to the cornea. Using the slit lamp, your doctor moves the tonometer to touch your cornea. The youngster contracted an alarming organism known as acanthamoeba through infected tap water while visiting Canada last year, and it began to eat away at his cornea. Show More Sentences Unlike the rest of the eye, or most of the body, the cornea is a privileged organ. Viral conjunctivitis can spread to the cornea, the white of the eye. Light rays pass through the cornea and the lens and focus on the retina. Photo-refractive keratectomy involves treating the surface of the cornea with an Excimer laser which results in flattening of the cornea to correct myopia. Prolonged lack of vitamin A leads to deterioration of the eye tissue through progressive keratinization of the cornea, a condition known as xerophthalmia. The liquid hydrogel, based on a dendritic macromer, has optical properties similar to the cornea, the layer that covers the iris and pupil of the eye. The laser in-situ keratomileusis procedure uses an excimer laser to make a thin flap in the cornea and etch away a predetermined pattern of tissue beneath the flap. For advanced keratoconus when vision is severely affected by scarring, penetrating keratoplasty or full thickness cornea transplant is the most common surgery performed. The zipper is created by suturing bolsters to the eyelids and then threading a separate suture between the bolsters to draw the lid over the cornea. The cornea and the crystalline lens refract light that enters the eye. He showed that UV rays were effective for treating tubercular and inflammatory eye conditions involving the conjunctiva, cornea, iris, ciliary body, choroids and retina. The lachrymatory factor from an onion activates the nerve endings of pain fibres in the top layer of the cornea, leading to increased production and release of tears. The flatter cornea then focuses images farther back inside the eyeball, projecting them on the retina instead of in front of it, as is the case in nearsightedness. The cornea is the clear part of the eye much like a watch crystal. Most eye infections can be cleared up with antibiotics but even with treatment there is a risk of damage to the cornea, the transparent outer layer at the front of the eye. It can be due to either a too flat cornea or the eyeball being too short. A computerized laser vaporizes a predetermined portion of the cornea. The cornea is reshaped to reduce the patient's dependence on glasses. There are some people who have corneal dystrophies such as Fuchs who also have macular degeneration, and they can benefit from transplantation when the cornea becomes cloudy. Eyewear covers the cornea, conjunctiva, and other ocular tissue. Show More Sentences According to the listing in the registration maintained in the eye hospital, patients in need of a cornea are informed and brought to the hospital. In hyperopia, the laser indirectly steepens the central cornea by removing tissue from the periphery, thus increasing the cornea's focusing power. In astigmatism, although the eye is perfectly healthy, the cornea is curved more like the surface of an egg, with a steep curve in one meridian and a flatter curve in others. Your surgeon then uses a fine thread to stitch the new cornea into place. Surgery can correct myopia by altering the shape of the cornea. The raw surface of your cornea repairs itself, assisted by a contact lens you wear as a bandage over your eye for three or four days after surgery. It lifts a thin surface layer of the cornea away from underlying layers. With myopia, the cornea is too curved or the eyeball too long. Radial keratotomy, which can correct some nearsightedness by a circle of tiny incisions made in the cornea to flatten it, has become the rage. The cornea has a flattened center where refraction is nearly equal in both water and air. He had scratched his cornea so badly that his doctor told him to wear a patch. Accordingly, it rapidly attacks the cornea and can induce permanent blindness if splashed onto eyes. She has a Dermoid cyst on her cornea and will not be able to have it removed until she is 6-8 months old. The cornea is the first major refractive surface of the eye and is responsible for over two thirds of its overall dioptric power. In radial keratotomy for myopia, for example, a doctor slices the cornea around the pupil in pizza-cutter fashion to flatten the cornea. It was first used to treat keratoconus in 1998 and its primary aim is to strengthen the weakened cornea in ectatic conditions or keratectasia. With PRK, or photorefractive keratectomy, the surgeon cuts away at the surface of the cornea. Jonathan Davidorf corrects employee Maria Gilmore's vision with conductive keratoplasty, a procedure that uses radio waves to reshape the cornea. Keratoplasty is the surgical procedure whereby a healthy cornea, usually from a deceased, human donor, is used to replace a damaged one. The technique, called conductive keratoplasty, uses radio waves to reshape the cornea. Show More Sentences Blood was pooling beneath her cornea, forming what is known as a hyphema. The new layer is located at the back of the cornea between the corneal stroma and Descemet's membrane. At its circumference the cornea joins the white of the eye, called the sclera. Eversion of the upper lid is important to exclude a foreign body abrading the cornea. It also makes an important contribution to the sieve-like trabecular mesh work in the cornea. Additional complications may include tube blockage, malposition, erosion and contact between the tube and iris or cornea. If the ophthalmic branch is cut the patient must be told about the hazards of having an insensate cornea. The eximer laser is then used to ablate or reshape the interior of the cornea to correct myopia, astigmatism, or farsightedness. Anterior segment tumors traverse aqueous outflow pathways, preexisting emissarial canals, or perforations in the cornea. Entropion, where the lower eyelid shrinks and pulls the eyelashes upwards into the eye scratching the cornea. Each ommatidium has its own cornea, lens, and photoreceptor cells for distinguishing brightness and color. To measure cornea thickness, ophthalmologists use a device called a pachymeter to look at the optic nerve. On further investigation it was found he had tiny hairs at different depths with his cornea as the result of the spider's defence mechanism. The cornea may be involved, intense and raised papillar formations are present. A parallelepiped section of the cornea should reveal that the debris is sub-epithelial rather than in the tear film. Dogs were conditioned to give an eyewink to light by pairing a light and a puff of air to the cornea. In experimental surgery, a cool laser produces shock waves that fragmentize part of the cornea. He also told me that he could see, on the cornea of my right eye, two keratic precipitates. In LASIK surgery, a computer-controlled laser is used to reshape the cornea. To stain photoreceptors of the dorsal rim area, the cornea and crystalline cone layer of the DRA were removed using a microscalpel. Show More Sentences The cornea, the outer covering of the eye, is relative flat and so of low refractive power. They also have glands on the eyelids and outer corneal layer that act as protection for the cornea. Diaton tonometer takes quick and painless measurement of IOP through upper eyelid, at tarsus and sclera, without touching or influence of the cornea vs. Pustules can form on the eyelid, conjunctiva, and cornea, leading to complications such as conjunctivitis, keratitis, corneal ulcer, iritis, iridocyclitis, and optic atrophy. Japan's first heart, liver, kidney and cornea transplants from a brain-dead donor took place on March 1 at the Kochi Medical School in Kochi Prefecture. Acanthamoeba is the commonest protozoal infection of the cornea and together with Pseudomonas species is commonly associated with keratitis from contact lens wear. In open-angle glaucoma, the angle where the cornea and the iris meet in the eye is open, but the aqueous humor fluid passes too slowly through the meshwork drain. It may invade just the cornea or extend into the orbit and adnexa. A scleral rim should be maintained in contact lenses to off-hold and balance the corneal portion from the cornea, preventing exertion of any pressure. The Nidek MK-2000 Keratome System is designed to create a lamellar flap on the surface of the cornea during refractive procedures, such as keratoplasty. The Diaton tonometer measures the intrapalpebral IOP by exerting pressure on the peripheral cornea, outside the ablation, and on the sclerocorneal limbus. Foreign bodies may lodge on cornea, tarsal plate or penetrate the globe. An incision was made around the ora serrata of each eye, and the anterior cornea, lens, capsule, and associated iris pigmented epithelium were removed. As the condition progresses small grey patches appear on the whites of the eye and the cornea become so dry that they can begin to ulcerate and may tear. Manatees are the only animal known to have a vascularized cornea. Examples from Classical Literature Its cercari are usually found in an acephalous mollusc, known by the name of Cyclas cornea. In two genera of fishes, anableps, Dialommus, the cornea is divided by a horizontal partition into two parts. With patience and a little skill, bivalves as small as cyclas cornea may be treated in this way. It is many years since I have looked at a fresh-water shell, but I should have said that the shell was cyclas cornea. If the iris lies in contact with the sclera and cornea for some time, it becomes adherent. The cornea of the eye can be readily cut by embedding in paraffin, and the section may be mounted in Farrant's solution. If there is any circulation, there should be an emerald green discoloration of the cornea of the eye. In stripping the head from the cornea some of the epithelium may be torn off with it. In other cases the ulcerated cornea may yield to pressure from within, which causes it to bulge forwards. Where the iris tissue lies in contact with the cornea, the stroma of the iris almost totally disappears. The anterior surface of the cornea is exquisitely smooth, and is kept moist by the lacrimal secretions. An incision is made behind the limbus, usually in an upper segment of the cornea, by means of a bent broad needle. Tumours which involve the cornea are usually secondary to tumours occurring at the limbus. In cases of trichiasis where a few eyelashes turn in on the conjunctiva or cornea they may be removed by this method. Wilks and Moxon compare simple gastric ulcer to ulcers of the cornea resulting from paralysis of the trigeminus. The pupil is usually dilated, the cornea becomes opaque and may ulcerate, and there is photophobia and sometimes diplopia. If untreated it lasts for years and it may destroy the cornea and consequently the sight. Wounds at the edge of the cornea are often followed by prolapse of the iris. Pterygium should be removed when advancing across the cornea, especially when the pupillary area is becoming involved. But if I incised the cornea, the animals manifested intense pain, when the aqueous humor escaped and the iris prolapsed. Show More Sentences The integral parts of the eye in front of the lens are the cornea, the aqueous humour, and the iris. The aqueous humour is contained between the lens and its ligament posteriorly and the cornea anteriorly. He was distinguished, also, as an oculist and aurist, and removed a particle of iron from the cornea by means of a magnet. In infancy and early youth the cornea may become uniformly enlarged and globular. A minute mosaic of chalcedony was used to portray white and iris and cornea. The ciliary muscle and the ligamentum pectinatum are both derived from the mesoblast between the cornea and the iris. The outer stratum gives rise to the corneal corpuscles, which are the only constituents of the cornea not yet developed. An ill-fitting lens can easily scratch the outermost layer of eye tissue, the crystal-clear cornea. The position and nature of the wound in the cornea and sclerotic. Entropion, with nebulous and vascular cornea in an old woman of seventy. Slight inequality of curvature in meridians of right cornea. These media are the cornea, the aqueous humor, and the vitreous humor. A It's an uneven curvature of the cornea at the front of the eye that distorts vision, resulting in blurring of small print. Thousands of people have lost their eyesight due to damages to the cornea, such as trauma, absent limbal stem cells or diseases. The meat, eggs, leather, bone oil and cornea of the bird are highly valuable. Keratoconus is an eye disease that causes the cornea to become thin and steep over time. Is there hope for people who develop a weak cornea and deteriorating vision after LASIK surgery? The cornea is formed by the coalescence of two structures, viz. The sap is used in Bombay to remove opacities of the cornea. In some cases the iris becomes totally adherent to the cornea. Show More Sentences It is pushed forward and may lie against the cornea at its periphery. In certain crustaceans, for instance, there is a double cornea, the inner one divided into facets, within each of which there is a lens-shaped swelling. The presence of the inlay creates a prolate effect that improves near and intermediate vision, while permitting distance vision through the peripheral cornea. On Wednesday, Canadian scientists announced the success of human clinical trials done with an artificial cornea developed by them using a synthetic biological material. Find more words! 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Words that rhyme with cornea What is the plural of cornea? What is the adverb for cornea? What is the adjective for cornea? What is the noun for cornea? Translations for cornea Use our Sentence Generator Nearby Words corne corn dog corncrib corncrake corncockle corn-cob corneal corneas corned corneille cornel Cornelia 6-letter Words Starting With c co cor corn corne