#cornea

• Aberrometer — A high-precision clinical diagnostic device used in ophthalmology to automatically measure and record the total optical aberrations of the eye (both lower-order aberrations like myopia and astigmatism, and higher-order ones like coma or trefoil). The device operates based on wavefront analysis, projecting a harmless laser beam onto the retina and measuring light distortions as it exits the eye, providing an essential digital map for customized refractive surgery.
• Leukoma — A pathological, whitish opacity of the eye's cornea, caused by a scar, infection, or structural trauma that partially or totally obstructs vision; leukoma. In a general chromatic and literary sense, the term denotes the quality of being white, the immaculate brightness, or the luminous reflection specific to snow or milk.
• Leukoma — A total or partial white opacity of the cornea, appearing after severe injuries, inflammations, or scarring processes, commonly known as leukoma; a genus of microscopic parasitic fungi from the oomycete class, causing the disease called 'white rust' on the leaves and stems of cruciferous plants.
• Allokeratoplasty — An ophthalmological surgical procedure in which a patient's damaged corneal tissue is replaced with a corneal graft (transplant) harvested from a deceased human donor of the same species; a homologous corneal transplant structurally performed to restore optical transparency and improve visual acuity.
• Allokeratoplasty — A highly precise ophthalmic surgical procedure consisting of transplanting or grafting a corneal fragment harvested from a deceased human (homologous) donor onto the eye of a patient presenting with opacities, perforations, or severe degenerative corneal diseases. This structural surgical treatment aims to restore corneal transparency, correct severe irregular astigmatism, and restore optimal visual acuity to the recipient.
• Argyrosis — A form of chronic silver poisoning or a localized clinical variant of argyria, characterized by the pathological deposition of silver microparticles within connective tissues; the term is specifically used in ophthalmology to describe the irreversible metallic impregnation of the corneal Descemet's membrane and the conjunctiva, causing a silvery-gray or greenish discoloration usually without affecting visual acuity.
• Astigmatic — A person suffering from astigmatism (a refractive error where light rays do not focus on a single point on the retina due to an irregular curvature of the cornea or lens, causing blurred or distorted vision at any distance); as an adjective, it describes an eye, optical system, or lens affected by or designed to correct this geometric aberration.
• Astigmatism — A refractive error of the eye, either congenital or acquired, characterized by an irregular, asymmetrical curvature of the cornea or lens, which prevents light rays from converging onto a single focal point on the retina, causing blurred, unclear, or distorted vision both at a distance and up close.
• Astigmometer — An optical precision apparatus or instrument used in ophthalmology and optometry to measure the degree and axes of ocular astigmatism, evaluating the curvature irregularities of the anterior surface of the cornea.
• Autologous keratoplasty — An ophthalmologic surgical procedure of corneal transplantation (keratoplasty) in which the tissue graft utilized originates from the same patient, completely eliminating the risk of immunological graft rejection.