Ophthalmology

A monocle is a type of corrective lens used to correct or enhance the vision in only one eye.

A cataract is a clouding of the lens in the eye leading to a decrease in vision.

Exotropia is a form of strabismus where the eyes are deviated outward.

Band keratopathy is a corneal disease derived from the appearance of calcium on the central cornea.

Intraocular pressure (IOP) is the fluid pressure inside the eye.

Posterior Ischemic Optic Neuropathy (PION) is a medical condition characterized by damage to the retrobulbar portion of the optic nerve due to ischemia, a restriction of the blood supply to the optic nerve.

Goggles or safety glasses are forms of protective eyewear that usually enclose or protect the area surrounding the eye in order to prevent particulates, water or chemicals from striking the eyes.

Phthisis bulbi is a shrunken, non-functional eye.

Acanthamoeba keratitis is a rare disease in which amoebae invade the cornea of the eye.

Cyclotropia is a form of strabismus in which, compared to the correct positioning of the eyes, there is a torsion of one eye (or both) about the eye's visual axis.

Adie syndrome (/ˈeɪdi/), sometimes known as Holmes–Adie syndrome or Adie's tonic pupil, is a neurological disorder characterized by a tonically dilated pupil that reacts slowly to light but shows a more definite response to accommodation (i.e., light-near dissociation).

Keratomalacia is an eye disorder that results from vitamin A deficiency.

A cone dystrophy is an inherited ocular disorder characterized by the loss of cone cells, the photoreceptors responsible for both central and color vision.

Kearns–Sayre syndrome (abbreviated KSS), also known as oculocraniosomatic disorder or oculocraniosomatic neuromuscular disorder with ragged red fibers, is a mitochondrial myopathy with a typical onset before 20 years of age.

Descemet's membrane is the basement membrane that lies between the corneal proper substance, also called stroma, and the endothelial layer of the cornea.

Presbyopia is a condition associated with aging of the eye that results in progressively worsening ability to focus clearly on close objects.

Retinal detachment is a disorder of the eye in which the retina separates from the layer underneath.

Persistent pupillary membrane (PPM) is a condition of the eye involving remnants of a fetal membrane that persist as strands of tissue crossing the pupil.

Sixth nerve palsy, or abducens nerve palsy, is a disorder associated with dysfunction of cranial nerve VI (the abducens nerve), which is responsible for causing contraction of the lateral rectus muscle to abduct (i.e., turn out) the eye.

Retinoschisis is an eye disease characterized by the abnormal splitting of the retina's neurosensory layers, usually in the outer plexiform layer.

Leber's congenital amaurosis (LCA) is a rare inherited eye disease that appears at birth or in the first few months of life, and affects around 1 in 80,000 of the population.

Macular edema occurs when fluid and protein deposits collect on or under the macula of the eye (a yellow central area of the retina) and causes it to thicken and swell (edema).

The pigmented layer of retina or retinal pigment epithelium (RPE) is the pigmented cell layer just outside the neurosensory retina that nourishes retinal visual cells, and is firmly attached to the underlying choroid and overlying retinal visual cells.

Monochromacy (mono meaning one and chromo color) is among organisms or machine the ability to distinguish only one single frequency of the electromagnetic light spectrum.

A fungal keratitis is an 'inflammation of the eye's cornea' (called keratitis) that results from infection by a fungal organism.

Eye drops are saline-containing drops used as an ocular route to administer.

Argyll Robertson pupils (AR pupils or, colloquially, "prostitute's pupils") are bilateral small pupils that reduce in size on a near object (i.e., they accommodate), but do not constrict when exposed to bright light (i.e., they do not react to light).

Ocular ischemic syndrome is the constellation of ocular signs and symptoms secondary to severe, chronic arterial hypoperfusion to the eye.

Color blindness, also known as color vision deficiency, is the decreased ability to see color or differences in color.

Enophthalmos is the posterior displacement of the eyeball within the orbit due to changes in the volume of the orbit (bone) relative to its contents (the eyeball and orbital fat), or loss of function of the orbitalis muscle.

The corneal limbus is the border of the cornea and the sclera (the white of the eye).

Keratoconjunctivitis is inflammation ("-itis") of the cornea and conjunctiva.

The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.

Organización Nacional de Ciegos Españoles (ONCE) (Spanish pronunciation: [ˈonθe], National Organization of Spanish blind people) is a Spanish foundation founded on December 13, 1938, to raise funds to provide services for the blind and people with serious visual impairment.

The central retinal vein is the venous equivalent of the central retinal artery and, like that blood vessel, it can suffer from occlusion (central retinal vein occlusion, also CRVO), similar to that seen in ocular ischemic syndrome.

Internuclear ophthalmoplegia (INO) is a disorder of conjugate lateral gaze in which the affected eye shows impairment of adduction.

Pellucid marginal degeneration (PMD), is a degenerative corneal condition, often confused with keratoconus.

Quadrantanopia, quadrantanopsia, or quadrant anopia refers to an anopia affecting a quarter of the field of vision.

The ciliary muscle /ˈsɪli.

LASIK or Lasik (laser-assisted in situ keratomileusis), commonly referred to as laser eye surgery or laser vision correction, is a type of refractive surgery for the correction of myopia, hyperopia, and astigmatism.

The field of view is the extent of the observable world that is seen at any given moment.

Tonometry is the procedure eye care professionals perform to determine the intraocular pressure (IOP), the fluid pressure inside the eye.

Dry eye syndrome (DES), also known as keratoconjunctivitis sicca (KCS), is the condition of having dry eyes.

The corneal endothelium is a single layer of cells on the inner surface of the cornea.

Parinaud's Syndrome, also known as dorsal midbrain syndrome, vertical gaze palsy, and Sunset Sign, is an inability to move the eyes up.

The Bowman's membrane (Bowman's layer, anterior limiting lamina, anterior elastic lamina) is a smooth, acellular, nonregenerating layer, located between the superficial epithelium and the stroma in the cornea of the eye.

Scintillating scotoma, also called visual migraine, is the most common visual aura preceding migraine and was first described by 19th-century physician Hubert Airy (1838–1903).

Binasal hemianopsia (or Binasal hemianopia) is the medical description of a type of partial blindness where vision is missing in the inner half of both the right and left visual field.

Brinzolamide (trade names Azopt, Alcon Laboratories, Befardin, Fardi Medicals, ) is a carbonic anhydrase inhibitor used to lower intraocular pressure in patients with open-angle glaucoma or ocular hypertension.

Dorzolamide (trade name Trusopt) is a carbonic anhydrase inhibitor.

Lisch epithelial corneal dystrophy (LECD), also known as band-shaped and whorled microcystic dystrophy of the corneal epithelium, is a rare form of corneal dystrophy first described in 1992 by Lisch et al.

Posterior amorphous corneal dystrophy (PACD) is a rare form of corneal dystrophy.

An anopsia or anopia is a defect in the visual field.

Aniseikonia is an ocular condition where there is a significant difference in the perceived size of images.

Visual acuity (VA) commonly refers to the clarity of vision.

Optic disc drusen (ODD) or optic nerve head drusen (ONHD) are globules of mucoproteins and mucopolysaccharides that progressively calcify in the optic disc.

Chronic progressive external ophthalmoplegia (CPEO), also known as progressive external ophthalmoplegia (PEO), is a type of eye disorder characterized by slowly progressive inability to move the eyes and eyebrows.

Terson syndrome or Terson's syndrome is the occurrence of a vitreous hemorrhage of the human eye in association with subarachnoid hemorrhage.

Glasses, also known as eyeglasses or spectacles, are devices consisting of lenses mounted in a frame that holds them in front of a person's eyes.

Papilledema (or papilloedema) is optic disc swelling that is caused by increased intracranial pressure.

The periorbita is the area around the orbit.

Dominant optic atrophy, or dominant optic atrophy, Kjer's type, is an autosomally inherited disease that affects the optic nerves, causing reduced visual acuity and blindness beginning in childhood.

Optic neuropathy refers to damage to the optic nerve due to any cause.

Herpetic simplex keratitis, also known as herpetic keratoconjunctivitis and herpesviral keratitis, is a form of keratitis caused by recurrent herpes simplex virus (HSV) infection in the cornea.

Electroretinography measures the electrical responses of various cell types in the retina, including the photoreceptors (rods and cones), inner retinal cells (bipolar and amacrine cells), and the ganglion cells.

Visual impairment, also known as vision impairment or vision loss, is a decreased ability to see to a degree that causes problems not fixable by usual means, such as glasses.

Retinitis pigmentosa (RP) is an inherited, degenerative eye disease that causes severe vision impairment due to the progressive degeneration of the rod photoreceptor cells in the retina.

Blepharophimosis is a condition where the patient has bilateral ptosis with reduced lid size, vertically and horizontally.

Conjugate gaze palsies are neurological disorders affecting the ability to move both eyes in the same direction.

Thygeson's superficial punctate keratopathy (TSPK; also Thygeson Superficial Punctate Keratitis) is a disease of the eyes.

Madarosis is a condition that results in the loss of eyelashes, sometimes eyebrows.

Oculomotor nerve palsy or third nerve palsy is an eye condition resulting from damage to the third cranial nerve or a branch thereof.

Exophoria is a form of heterophoria in which there is a tendency of the eyes to deviate outward.

Retinal hemorrhage is a disorder of the eye in which bleeding occurs into the light sensitive tissue on the back wall of the eye.

Rubeosis iridis is a medical condition of the iris of the eye in which new abnormal blood vessels (i.e. neovascularization) are found on the surface of the iris.

Subconjunctival hemorrhage, also known as subconjunctival haemorrhage and hyposphagma, is bleeding underneath the conjunctiva.

Allergic conjunctivitis is inflammation of the conjunctiva (the membrane covering the white part of the eye) due to allergy.

Anisocoria is a condition characterized by an unequal size of the eyes' pupils.

Keratoconus (KC, KCN, KTCN) is a degenerative disorder of the eye in which structural changes within the cornea cause it to thin and change to a more conical shape than the more normal gradual curve.

Glands of Zeis are unilobar sebaceous glands located on the margin of the eyelid.

Botulinum toxin therapy of strabismus is a medical technique used sometimes in the management of strabismus, in which botulinum toxin is injected into selected extraocular muscles in order to reduce the misalignment of the eyes.

In medicine, a bleb is a blister (often hemispherical) filled with serous fluid.

The L V Prasad Eye Institute (LVPEI) was established in 1987 at Hyderabad as a not-for-profit, non-government eye care institution.

The Applied Genetic Technologies Corporation is a publicly traded (NASDAQ:AGTC) biotechnology company that is part of the NASDAQ Biotechnology Index.

Stereoscopic acuity, also stereoacuity, is the smallest detectable depth difference that can be seen in binocular vision.

Herpes zoster ophthalmicus (HZO) and also known as ophthalmic zoster is a disease characterised by reactivation of dormant varicella zoster virus residing within the ophthalmic nerve (the first division of the trigeminal nerve).

Rose bengal (4,5,6,7-tetrachloro-2',4',5',7'-tetraiodofluorescein) is a stain.