(n.) The transparent part of the coat of the eyeball which covers the iris and pupil and admits light to the interior. See Eye.
Example Sentences:
(1) Displacement of the surface of the cornea of bovine eyes after disruption of intact structures was investigated by means of holographic interferometry.
(2) The patient, a 12 year-old boy, showed a soft white yellowish mycotic excrescence with clear borders which had followed the introduction of a small piece of straw into the cornea.
(3) Increased amounts of laminin in the basal epithelium of the cornea and of collagen type III in the stroma and subepithelial components of the stroma were observed.
(4) We report on a membrane inflation method of wound spreading in intact human corneas using the Baribeau Micronscope.
(5) When 5 corneas with quiescent HSK were cultured in vitro, 3 again became HSV antigen positive.
(6) Corneas of bullfrog (Rana catesbeiana) were mounted between lucite chambers.
(7) The eye is of the closed vesicle type and is composed of retina, cornea, vitreous body, lens and optic nerve.
(8) The steps in the model are the drug elimination rate in the precornea and anterior chamber, the rate of drug dissolution, the rate of drug penetration into the cornea, and the rate of drug transport into the aqueous humor.
(9) Gas trapping and corneal edema were not observed in uncovered corneas or corneas covered with membrane lenses.
(10) Since lymphocytic cells in intimate contact with degenerating keratocytes have previously been identified in the cornea, these observations provide a basis for the view that cell-mediated immunopathogenesis is involved in the etiology of herpetic stromal keratitis.
(11) Lactate dehydrogenase (LDH) levels and subunit isozyme patterns in cornea were monitored in 36 albino rabbits wearing thick, rigid, gas-permeable contact lenses for periods of 24 h, 2 and 7 days, and 1 and 3 months.
(12) Calculations of energies of activation, taken from Arrhenius plots, indicate that the diffusion of drug across the cornea may be by two different mechanisms that depend on the physical-chemical characteristics of the perfusant.
(13) The mean in the newborn-to-6-month-old group was 47.59 D; in the 12-18-month-old group it had decreased to 45.56 D. The cornea appears to stabilize at about 54 months, with an average reading of 42.69 D. Evaluation of 11 eyes diagnosed as having persistent hyperplastic primary vitreous revealed that eyes with this diagnosis generally have steeper corneas than normal eyes at any given age.
(14) There was no significant difference in the wound-healing rate, but at 36 hours there was a reduction in wound-healing rate of the excimer ablated corneas.
(15) More importantly, this study reports the first detection of LAT in RNA extracted from 9% of corneas from latently infected rabbits (n = 22) by the polymerase chain reaction.
(16) Cat corneas were stored at refrigerator temperatures in M-K medium (TC-199, 5% dextran), modified M-K medium (TC-199, 1% chondroitin sulfate), or on the intact globe in moist chambers for intervals of one to nine days.
(17) Pterygia, triangular sheets of fibrovascular tissue that invade the cornea, have recurrence rates of 30% to 50% with currently available surgical procedures.
(18) Rabbit corneas grown in organ culture (24 well plate) were inoculated topically with 50 microliters (5 x 10(5) pfu) of different ocular adenoviral serotypes (ATCC and clinical isolates).
(19) A recipient cornea gradually developed wrinkling and opacification in Bowman's layer following an uneventful myopic epikeratoplasty.
(20) In neurological diseases the hyposensitivity could include the cornea, conjunctiva and lid margin.
Leucoma
Definition:
(n.) A white opacity in the cornea of the eye; -- called also albugo.
Example Sentences:
(1) Histologically, this presented as an adherent leucoma with partial loss of intraocular contents (retina, iris, and lens), intraocular bone undergoing haematopoiesis, a small granulomatous lesion with foreign body adjacent to the optic nerve in the dural sheath, and gliosis of the optic nerve.
(2) It was found that the commonest causes of blindness in order of frequency were glaucoma (31%), cataract (18.4%), optic atrophy (16.3%), onchocerciasis (4.9%), and corneal leucoma (4.9%).
(3) At least 8 months of follow-up were available for 19 eyes, including aphakic glaucoma, 8 eyes; neovascular glaucoma, 2 eyes; previous failed filter, 6 eyes; total collapse of the anterior chamber with leucoma adherence, 1 eye; glaucoma due to mesodermal dysgenesis, 1 eye; and juvenile glaucoma, 1 eye (whose fellow eye had received twice failed filtering procedures).
(4) The visual acuity was 0.5 or better in 66%, 0.7 or better in 45%, less than 0.1 in 3 patients because of vitreous opacity and corneal leucoma.
(5) The relative rarity of herpetic dendritic ulcers and corneal dystrophies are highlighted while the major indication for keratoplasty in southern Nigeria is leucoma associated with measles or trauma.
(6) But this method is useful in the treatment of vascularized leucoma because it shows us the exact locus where the laser must be applied before the corneal graft is made.
(7) One observed as acceleration of the regeneration processes in active inflammatory conditions of the anterior eye segment; instead the cases of leucoma and corneal opacities did not show any clinical effect.
(8) To date, the most important indications for fitting the Hema contact less with an iris structure have been aniridia, albinism, iris coloboma, essential iris atrophy, and leucoma corneae.
(9) The main causes of low visual acuity were: corneal leucoma, secondary glaucoma, complicated cataract.
(10) -- Finally repeated grafts on severe leucomas (burns, leucoma adherens, inflammatory keratopathies with active neovascularisation, etc.