Categories: Articles lacking sources from October 2006 | All articles lacking sources | Ophthalmology Pathology (from Greek pathos, feeling, pain, suffering; and logos, study of; see also -ology) is the study of the processes underlying disease and other forms of illness, harmful abnormality, or dysfunction. ... Eyes are organs of vision that detect light. ... An eyelid is a thin fold of skin and muscle that covers and protects an eye. ... Tears are a liquid produced by the bodys process of lacrimation to clean and lubricate the eyes. ... In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated. ... A stye (also spelled sty) or hordeolum is an infection of the sebaceous glands at the base of the eyelashes. ... A chalazion, also known as a Meibomian gland lipogranuloma, is a cyst in the eyelid that is caused by inflammation of the meibomian gland, usually on the upper eyelid. ... Blepharitis is inflammation of the eyelids. ... Entropion is a medical condition in which the eyelids fold inward. ... Ectropion is a condition of loose eyelids. ... Lagophthalmos describes difficulty in complete closure of the eyelid over the eyeball. ... Blepharochalasis is an inflammation of the eyelid that is characterized by exacerbations and remissions of eyelid edema, which results in a stretching and subsequent atrophy of the eyelid tissue. ... In ophthalmology, ptosis is an abnormally low position (drooping) of the upper eyelid. ... Xanthelasma (or xanthelasma palpebrarum) are sharply demarcated yellowish collections of cholesterol underneath the skin, usually around the eyes. ... Trichiasis is a medical term for ingrown eyelashes. ... Dacryoadenitis is inflammation of the lacrimal glands (the tear-producing glands). ... Epiphora is excessive tear production, usually a result from an irritation of the eye. ... Exophthalmos (or proptosis) is a bulging of the eye anteriorly out of the orbit. ... Enophthalmos is recession of the eyeball within the orbit. ... The conjunctiva is a membrane that covers the sclera (white part of the eye) and lines the inside of the eyelids. ... A pterygium, meaning wing, is a benign growth of the conjunctiva. ... A subconjunctival hemorrhage is a common and relatively minor post-LASIK complication. ... Schematic diagram of the human eye. ... The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eyes optical power [1]. Together with the lens, the cornea refracts light and, as a result, helps the eye to focus. ... Scleritis is a serious inflammatory disease that affects the white outer coating of the eye, known as the sclera. ... A corneal ulcer is an inflammatory condition of the cornea involving loss of its outer layer. ... Snowblind redirects here. ... Thygesons superficial punctate keratopathy (TSPK) is a disease of the eyes. ... Fuchs dystrophy is a slowly progressing corneal disease that usually affects both eyes and is slightly more common in women than in men. ... Keratoconus (from Greek: kerato- horn, cornea; and konos cone), is a degenerative non-inflammatory disorder of the eye in which structural changes within the cornea cause it to thin and change to a more conical shape than its normal gradual curve. ... Keratoconjunctivitis sicca (KCS), also called keratitis sicca,[1] sicca syndrome,[1] xerophthalmia,[1] dry eye syndrome (DES),[1] or simply dry eyes,[1] is an eye disease caused by decreased tear production or increased tear film evaporation commonly found in humans and some animals[2]. Keratoconjunctivitis sicca is Latin and... Arc eye, also known as arc flash, welders flash, corneal flash burns, or flash burns, is a painful ocular condition sometimes experienced by welders who have failed to use adequate eye protection. ... Keratoconjunctivitis sicca or KCS is an eye disease caused by decreased tear production or increased tear film evaporation commonly found in people and small animals. ... Corneal neovascularization is the excessive ingrowth of blood vessels from the limbal vascular plexus into the cornea. ... Kayser-Fleischer rings are pigmented rings in the peripheral cornea, resulting from copper deposition in Descemets membrane. ... Arcus senilis (or Arcus senilis corneae. ... The human iris The iris is the green/grey/brown area. ... Schematic diagram of the human eye The ciliary body is the part of the eye containing the ciliary muscle and ciliary processes. ... Iritis is a form of anterior uveitis and refers to the inflammation of the iris of the eye. ... Uveitis specifically refers to inflammation of the middle layer of the eye, termed the uvea but in common usage may refer to any inflammatory process involving the interior of the eye. ... Iridocyclitis, also known as anterior uveitis, is a condition in which the uvea of the eye suffers inflammation. ... Caused by a blunt blow to the eye. ... 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. ... Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. ... Human eye cross-sectional view, showing position of human lens. ... Aphakia is the absence of the lens of the eye, due to surgical removal, perforating wound or ulcer, or congenital anomaly; causes a loss of accommodation, hyperopia, and a deep anterior chamber. ... The choroid, also known as the choroidea or choroid coat, is the vascular layer of the eye lying between the retina and the sclera. ... Human eye cross-sectional view. ... Retinal detachment is a disorder of the eye in which the retina peels away from its underlying layer of support tissue. ... Retinoschisis is an uncommon eye disease characterized by the abnormal splitting of the retinas sensory layers, usually in the outer plexiform layer, with resulting loss of visual function [1]. The retina, which consists of multiple layers of interconnected nerve and pigment cells, separates into separate layers resulting in a... Hypertension, or high blood pressure that does not respond to treatment, has several ocular manifestations. ... Diabetic retinopathy is retinopathy (damage to the retina) caused by complications of diabetes mellitus, which could eventually lead to blindness. ... Retinopathy is a general term that refers to some form of non-inflammatory damage to the retina of the eye. ... Retinopathy of prematurity (ROP), previously known as retrolental fibroplasia (RLF), is a disease of the eye that affects prematurely born babies. ... Listen to this article · (info) · play in browser This audio file was created from an article revision dated 2005-07-19, and may not reflect subsequent edits to the article. ... Normal vision. ... Macular edema occurs when fluid and protein deposits collect on or under the macula, causing it to thicken and swell. ... Binoculars A set of binoculars (from Latin, bi-, two-, and oculus, eye) is a hand-held tool used to magnify distant objects by passing the image through two adjacent series of lenses, and erecting prisms. ... Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. ... The straw seems to be broken, due to refraction of light as it emerges into the air. ... For the protein Strabismus, see Strabismus (protein) Strabismus, also known as heterotropia, squint, crossed eye, cockeyed, wandering eye,weak eye or wall eyed, is a condition in which the eyes are not properly aligned with each other. ... Ophthalmoparesis is a physical finding in certain neurologic illnesses. ... Progressive external ophthalmoplegia is a disorder of the mitochondria. ... Person exhibiting esotropia of the right eye Esotropia is a form of strabismus where one or both of the eyes turn inward. ... Exotropia is a form of strabismus where the eyes are deviated outward. ... Refraction error, also known as refractive error, is an error in the focusing of light by the eye and a frequent reason for reduced visual acuity. ... Hyperopia, also known as hypermetropia or colloquially as farsightedness or longsightedness, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or when the lens cannot become round enough), causing inability to focus on near objects, and in extreme cases causing... Normal vision. ... Astigmatism is an affliction of the eye, where vision is blurred by an irregularly shaped cornea. ... Anisometropia is a condition in which the lenses of the two eyes have different focal lengths; that is, are in different states of myopia (nearsightedness) and hyperopia (farsightedness). ... Presbyopia is the eyes diminished power of accommodation that occurs with aging. ... Sixth nerve palsy, or abducens nerve palsy, is a disorder associated with dysfunction of cranial nerve VI (the abducens nerve) which is responsible for contracting the lateral rectus muscle to abduct (i. ... Kearns-Sayre syndrome (abbreviated KSS) is a disease caused by a 5,000 base deletion in the mitochondrial DNA. As such, it is a rare genetic disease in that it can be heteroplasmic, that is, more than one genome can be in a cell at any given time. ... An individual diagnosed with Duane syndrome in the left eye. ... Convergence insufficiency is a sensory and neuromuscular anomaly of the binocular vision system, characterized by an inability to converge the eyes or sustain convergence. ... Internuclear ophthalmoplegia is a physical finding, or sign, that is a particular form of [[[ophthalmoparesis]]. It can affect either the right or left eye. ... Aniseikonia is an ophthalmological condition caused by unequal retinal image sizes. ... Blindness is the condition of lacking visual perception due to physiological or psychological factors. ... Amblyopia, or lazy eye, is a disorder of the eye. ... Lebers congenital amaurosis is a rare inherited eye disease that appears at birth or in the first few months of life, typically characterized by nystagmus, sluggish or no pupillary responses, and severe vision loss or blindness. ... Asthenopia is an ophthalmological condition that manifests itself through unspecific symptoms such as fatigue, eye strain, pain in or around the eyes, blurred vision, headache and occasional double vision. ... Hemeralopia is the exact opposite of Nyctalopia (Night Blindness). ... Photophobia (also light sensitivity) or fear of light, is a symptom of excessive sensitivity to light and the aversion to sunlight or well-lit places. ... Scintillating scotoma is the most common visual aura preceding migraine and was first described by 19th century physician Hubert Airy (1838–1903). ... Diplopia, commonly known as double vision, is the perception of two images from a single object. ... The word scotoma is derived from the Greek word for darkness. ... An anopsia (or anopia) is a defect in the visual field. ... Binasal hemianopsia is the medical description of a type of partial blindness that is associated with certain lesions of the eye, and of the central nervous system, such as congenital hydrocephlus. ... Paris as seen with full visual fields Paris as seen with bitemporal hemianopsia Bitemporal hemianopsia is the medical description of a type of partial blindness that is associated with lesions of the optic chiasm, the area where the optic nerves from the right and left eyes cross near the pituitary... Homonymous hemianopsia is a medical term for a type of partial blindness resulting in a loss of vision in the same visual field of both eyes. ... Color blindness in humans is the inability to perceive differences between some or all colors that other people can distinguish. ... Achromatopsia is the inability to see color. ... Nyctalopia (Greek for night blindness) is a condition making it difficult or impossible to see in the dark. ... Blindness is the condition of lacking visual perception due to physiological or psychological factors. ... Low vision is alternatively a general term used to describe lowered visual acuity, and a specific legal term in Canada and the United States used to designate someone with vision of 20/70 or less in the better eye with correction. ... Infection is also the title of an episode of the television series Babylon 5; see Infection (Babylon 5). ... Binomial name Onchocerca volvulus Bickel 1982 Onchocerciasis (pronounced ) or river blindness is the worlds second leading infectious cause of blindness. ... For other uses, see Floater (disambiguation). ... Leber’s hereditary optic neuropathy (LHON) or Leber optic atrophy is a mitochondrially inherited (mother to all offspring) form of acute or subacute loss of central vision that may lead to degeneration of retinal ganglion cells (RGCs) and their axons; this affects predominantly young adult males. ... Many primary care physicians often deal with patients with red eyes In medicine, red eye is a non-specific term to describe an eye that appears red due to illness, injury, or some other condition. ... In medical terminology, Argyll Robertson pupils are small, irregular pupils that accommodate but do not react normally to light. ... A fungal keratitis is an inflammation of the eyes cornea (called keratitis) that results from infection by a fungal organism. ... Xerophthalmia (Greek for dry eyes) is a medical condition in which the eye doesnt produce tears. ... Aniridia is a rare congenital condition characterized by the underdevelopment of the eyes iris. ...