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At least 19 recordsLinked to original sources
PubMed2006

[Emphasis on basic research for corneal diseases].

Corneal disease is the second leading cause of blindness in China. Improvement of the diagnosis and treatment of corneal disease depends on the deepening and widening of the basic research in this area. In some fields, the research conducted in our country has reached the top level in the world. However, in general, obvious disparities exist between China and the developed countries in terms of lack of systematic research, limited financial support, the insufficiency of the quality and quantity of researchers and so on. Based upon the current situations of China, the future basic research on corneal diseases should focus on the mechanism of infectious corneal diseases, gene mutation of corneal dystrophy, corneal tissue engineering, the pathogenesis of dry eye, the reconstruction after severe chemical burns of ocular surface, the pathogenesis of ocular surface neovascularization, the prophylaxis and therapy of corneal graft rejection, etc. Other important measures to improve the basic research of corneal diseases in our country would include applying for more research funds, training high quality researchers, and strengthening the cooperation with different disciplines and with other countries.

China↗
PubMed1992

[Recovery of corneal sensitivity following keratoplasty and corneal diseases].

Corneal sensitivity (CS) was tested in 201 eyes with clear plastic grafts and in 193 eyes with corneal diseases, using the Cochet-Bonnet Aesthesiometer. After keratoplasty, the CS returned to normal in 40.0% and 50.0% of the eyes with non-HSK in 5-6 years and 7-22 years respectively, while only 17.2% of the eyes with HSK showed normal CS in 7-22 years postoperative. The corneas of HSK patients were markedly hypoesthetic all over, whereas in non-HSK patients, the corneal hypoesthesia involved only the morbid area. The examination of CS is useful in the diagnosis of corneal diseases and evaluation of nerve regeneration after keratoplasty.

Adolescent↗
PubMed1978

Role of the ocular surface in destructive corneal disease.

Corneal destructive disease is related to the ocular surface in at least three ways. Firstly, the maintenance of surface integrity seems to protect the corneal stroma from ulceration. Such integrity is jeopardized if the corneal epithelial cells fail to replicate themselves, or if they fail to adhere tightly to the underlying stroma. Secondly, the ocular surface plays a role in ulceration. Elaboration of collagenolytic enzymes may occur in the abnormal ocular surface epithelial cells themselves. In addition, the surface may modulate the leucocytic response in the stroma, the leucocytes themselves being responsible for the ulceration of the stroma. Finally, the ocular surface appears to play a role in superficial vascularization of the cornea. When all of the corneal epithelium is lost, as is the case in widespread chemical injury, sluggish metabolic transformation of conjunctival cells is associated with vascularization.

Adhesiveness↗
PubMedDate not supplied

[Place of the transplantation of the amniotic membrane in the treatment of corneal diseases concomitant with corneal neovascularization].

Published data and authors' independent observations related with the influence produced by the transplantation of the amniotic sac on corneal neovascularization are described. The epithelial-and-stromal corneal defect as well as the limbic epithelium deficit with a subsequent conjunctivization of the corneal epithelium and corneal neovascularization are one of the key mechanisms of corneal neovascularization. The amniotic sac transplantation, made for the purpose of reconstructing the eye surface, ensures the conditions for a fast recovery of the corneal epithelium and, thus, prevent the corneal neovascularization. The surgery can be recommended as an effective treatment technique applicable to corneal pathologies concomitant with the limbic epithelium deficit, persistent epithelial-and-stromal corneal defect and with the corneal neovascularization.

Amnion↗
PubMed1979

[Trophic corneal diseases. Their pathogenesis and corneal nutrition (author's transl)].

Experimental research has not provided any proof that "trophic" corneal diseases are caused by nutritional deficiencies. It seems that cases in which the course is chronic, but characterized by an absence of exacerbations of great pain and failure of medical therapy, are said to be trophic. Some of these diseases are dry eye conditions. Sensory disturbances lead to corneal complications by lowering the blinking frequency, but not seem to interfere with nutrition of the tissue. Otherwise keratoplasty would be impossible, since the innervation of the graft is often impaired for months or even years.

Chronic Disease↗
PubMed2002

Corneal diseases of rabbits.

Corneal diseases are common in domestic rabbits. It is important to carefully evaluate the cornea and the entire eye when rabbit present with clinical signs such as squinting, tearing, or conjunctival hyperemia. Complete ophthalmic examination and general physical examination should be performed on all rabbits with corneal disease. Important diagnostic testing include culture and sensitivity, cytology, and fluorescein staining. Breed predispositions do not occur for most corneal problems, although some diseases are selected genetically in research rabbits. Corneal disease can be a primary condition or can occur secondary to other ocular or systemic disease.

Animals↗
PubMed1998

Angiogenesis in corneal diseases: histopathologic evaluation of 254 human corneal buttons with neovascularization.

PURPOSE: Angiogenesis in corneal diseases can necessitate corneal transplantation and induce graft rejection. The aim of this study was to find out the histopathologic prevalence of angiogenesis in human corneas removed during keratoplasty, to establish the histopathologic diagnoses most commonly associated with angiogenesis, and to evaluate the anatomic location of new corneal vessels. METHODS: Corneal buttons (2,557) after keratoplasty were sent to and analyzed in our ophthalmopathology laboratory between 1992 and 1996. Of these, 1,278 full-thickness and lamellar corneal buttons were randomly retrieved and evaluated in this study. RESULTS: Of 1,278 human corneal buttons obtained by keratoplasty, 254 (19.9%) showed angiogenesis. Associated histopathologic diagnoses were (a) scarring after keratitis (109, 45.4%); (b) graft rejection and insufficiency (73, 30.4%); (c) acute necrotizing ulcerative keratitis (30, 12.5%); and (d) scarring after mechanical or chemical injuries (28, 11.7%). Histopathologically, new vessels were usually associated with corneal edema or inflammatory cells or both (76%). The most common locations of new vessels were the upper and middle third of the corneal stroma. Only 11% of new vessels were located solely in the deep stromal layers. CONCLUSION: Angiogenesis is a common histopathologic feature of corneal diseases leading to corneal transplantation and was found in 19.9% of excised human corneal buttons. Systemic or topical antiangiogenic therapy could reduce the need for corneal transplantation and retransplantation.

Adolescent↗
PubMed2003

Bacterial corneal diseases in dogs and cats.

Corneal diseases are very common in small animals. Corneal disease associated with bacterial agents is frequent in the dog and maybe less frequent in the cat. The medical history, important steps of the ophthalmic examination, and the ophthalmic diagnostic tests that are relevant in such corneal conditions are outlined. Bacterial corneal diseases in dogs and cats are most commonly considered in one of two categories--bacterial ulcerative keratitis and corneal abscesses. The clinical aspects of these two entities as well as the therapeutic strategies available for general practitioners and ophthalmologists are discussed. Ulcerative keratitis is frequent; it represents the most common ocular diseases in dogs and cats. Because some of these corneal ulcers can be very severe, progress rapidly, and therefore are sight threatening, the crucial steps of their diagnosis and management are stressed. The use of a magnification system, fluorescein dye, and corneal cytology and culture, if indicated, is necessary for diagnosis at an early stage of the disease. The treatment of bacterial ulcerative keratitis should eradicate the infection, reduce or stop the corneal destruction and support the corneal structures, control the uveal reaction and the pain associated with it, and minimize the scarring. The prognosis depends on the stage and the severity of the corneal ulceration, the etiology of the condition, and the therapeutic choice. A close follow-up of animals with corneal ulceration is highly recommended because corneal ulcers can progress rapidly.

Animals↗
PubMed1990

Detection of herpes viral genomes in normal and diseased corneal epithelium.

Herpetic ocular disease is one of the major causes of corneal blindness. Clinical diagnosis of corneal disease is based principally on corneal appearance. However, abnormal morphology of the corneal epithelium (CE) is not an indicator for the presence of a herpes virus. Further, it has not been established if herpes viruses are present in normal corneal epithelial tissue. In these studies, the polymerase chain reaction was used to evaluate normal and diseased corneal epithelium for the presence of herpes simplex virus type 1 (HSV-1), Epstein-Barr virus (EBV) and cytomegalovirus (CMV) genomic sequences. Thirty-two normal corneal epithelium specimens obtained from cadavers shortly after death were analyzed for HSV-1, EBV and CMV genomic sequences. Three of the 32 normal CE specimens were positive for amplified EBV DNA, 1 was positive for HSV-1 DNA, and none was positive for CMV DNA. We also tested eight herpetic dendritic lesions of which 3 were HSV-1 culture and PCR positive. The remaining five dendritic lesions were HSV-1 culture and PCR negative. Since these lesions were not evaluated for other herpesviruses, the etiology of these dendritic lesions is unknown. Six corneal epithelium samples from HIV-infected donors were negative for EBV, CMV and HSV-1 amplified sequences. Positive EBV, CMV and HSV-1 serology on all normal donors and on donors with clinically apparent disease did not correlate with positive PCR results. The results of these studies suggest that EBV and HSV-1 DNA can be amplified from a small percentage of apparently normal corneal epithelium.

Adult↗
PubMed1987

Keratoendotheliitis fugax hereditaria. A clinical and specular microscopic study of a family with dominant inflammatory corneal disease.

A peculiar hereditary corneal disease seen in one pedigree is presented. The disease manifests itself as transient attacks of kerato-endotheliitis. These attacks last from a few days to some weeks. Clinically, corneal oedema and endothelial guttata-like changes with very slight anterior chamber reaction can be seen; after many attacks there may be permanent opacities in the stroma. Endothelial specular photography during an attack reveals dramatic changes: large black nonreflecting areas between quite normal-looking hexagonal cells. Also between the attacks and among family members who have no clinical corneal disease, changes in the endothelium: black spots in the centres of endothelial cells and marked pleomorphism, are to be seen. Among the family members a high incidence of collagen diseases was found.

Adult↗
PubMed1999

[Central corneal diseases].

BACKGROUND: Central corneal pathologies can lead to an irreversible decrease of best corrected visual acuity if not diagnosed and treated appropriately. This article reviews the differential diagnosis of central corneal opacities in the newborn, of central infectious corneal ulcers, and the therapy of sterile, central keratolysis. MATERIAL AND METHODS: Authors' personal experience and review of the literature. RESULTS: Flow charts for diagnosis and treatment strategy have been elaborated. CONCLUSIONS: Corneal opacities in newborns create an emergency situation. In order to treat successfully and avoid or diminish amblyopia, it is imperative to rule out congenital glaucoma. The aetiology of central corneal ulcers should always be confirmed by positive cultures to be able to treat specifically. When the standard topic therapy fails, one has to consider rare bacteria, parasites, virus, or patients' compliance. The treatment of central sterile keratolysis in rheumatoid arthritis must be intensive and immunosuppression has to be performed early enough in the course of prevent the formation of a descemetocoele or spontaneous corneal perforation.

Arthritis, Rheumatoid↗
PubMed1992

Compensatory epithelial hyperplasia in human corneal disease.

Compensatory hyperplasia of the corneal epithelium (CEH) has been observed histopathologically in animal and human eyes after excimer laser photoablative keratectomy, and has been implicated as a cause of variable refractive results and refractive regression after this procedure. Retrospective histopathologic analysis of routine keratoplasty specimens revealed CEH in 85 of 130 (65%) corneas with keratoconus, 18 of 36 (50%) corneas with chronic herpes simplex virus (HSV) keratitis, and 14 of 25 (56%) corneas coded as nonspecific scars. Mild CEH occurred apically and/or peripherally in keratoconus. Massive CEH (up to 200 microns thick) occurred in chronic HSV keratitis with irregular stromal loss. Our data indicate that CEH occurs frequently in several corneal diseases marked by stromal ectasia or loss. We postulate that stromal loss may contribute to CEH by providing relative protection against exfoliative shearing forces of superior eyelid closure. Our study complements previous reports that imply that CEH is a contributory factor in refractive regression after excimer laser photoablation.

Cornea↗