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Mydriasis is an excessive dilation of the pupil due to disease or drugs. Normally, pupil dilates in the dark and constricts in the light. A mydriatic pupil will remain excessively large, even in a bright environment. It is occasionally referred to as a "blown pupil." Image File history File linksMetadata Download high resolution version (1704x2272, 1194 KB) Summary Dilated pupils after an optometrist appointment. ...
The International Statistical Classification of Diseases and Related Health Problems (most commonly known by the abbreviation ICD) provides codes to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances and external causes of injury or disease. ...
The International Statistical Classification of Diseases and Related Health Problems 10th Revision (ICD-10) is a coding of diseases and signs, symptoms, abnormal findings, complaints, social circumstances and external causes of injury or diseases, as classified by the World Health Organization (WHO). ...
// H00-H59 - Diseases of the eye and adnexa (H00-H06) Disorders of eyelid, lacrimal system and orbit (H00) Hordeolum and chalazion (H000) Hordeolum and other deep inflammation of eyelid (H001) Chalazion (H01) Other inflammation of eyelid (H010) Blepharitis (H011) Noninfectious dermatoses of eyelid (H02) Other disorders of eyelid (H020) Entropion...
The International Statistical Classification of Diseases and Related Health Problems (most commonly known by the abbreviation ICD) provides codes to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances and external causes of injury or disease. ...
The following is a list of codes for International Statistical Classification of Diseases and Related Health Problems. ...
The Mendelian Inheritance in Man project is a database that catalogues all the known diseases with a genetic component, and - when possible - links them to the relevant genes in the human genome. ...
The Disease Bold textDatabase is a free website that provides information about the relationships between medical conditions, symptoms, and medications. ...
The human eye The pupil is the central transparent area (showing as black). ...
This article is about the medical term. ...
An assortment of psychoactive drugs A psychoactive drug or psychotropic substance is a chemical substance that acts primarily upon the central nervous system where it alters brain function, resulting in temporary changes in perception, mood, consciousness and behavior. ...
Pupil dilated using anaesthetic and muscle relaxant. ...
The opposite, constriction of the pupil, is called miosis. Miosis should not be confused with meiosis, the cellular division process involved in sexual reproduction. ...
Mechanism
There are two types of muscle that control the size of the iris: circular muscle and radial muscle. The former is innervated by the parasympathetic nervous system, the latter by the sympathetic nervous system. Sympathetic stimulation of α1 adrenergic receptors causes the contraction of the radial muscle, and subsequent dilation of the iris. Conversely, parasympathetic stimulation cause contraction of the circular muscle and constriction of the iris. The Iris sphincter muscle is a muscle of the human body. ...
The iris dilator muscle (pupil dilator muscle, pupillary dilator, radial muscle of iris, radiating fibers), is a muscle of the eye. ...
Autonomic nervous system innervation, showing the sympathetic and parasympathetic (craniosacral) systems, in red and blue, respectively The parasympathetic nervous system is one of three divisions of the autonomic nervous system. ...
Grays FIG. 838â The right sympathetic chain and its connections with the thoracic, abdominal, and pelvic plexuses. ...
The adrenergic receptors (or adrenoceptors) are a class of G_protein coupled receptors that is the target of catecholamines. ...
The mechanism of mydriasis depends on the agent being used. It usually involves either a disruption of the parasympathetic nerve supply to the eye (which causes contraction of the pupil), or over activity of the sympathetic nervous system (SNS). The parasympathetic nervous system is one of two divisions of the autonomic nervous system. ...
Grays FIG. 838â The right sympathetic chain and its connections with the thoracic, abdominal, and pelvic plexuses. ...
Causes Pathological The parasympathetic nervous supply which causes constriction of the pupil, or miosis, is supplied by cranial nerve III, the oculomotor nerve. Damage to this nerve typically manifests itself as mydriasis, because the sympathetic supply to the pupil which causes mydriasis remains unaffected, and therefore unopposed. Anatomy and Physiology of the A.N.S. In contrast to the voluntary nervous system, the involuntary or autonomic nervous system is responsible for homeostasis, maintaining a relatively constant internal environment by controlling such involuntary functions as digestion, respiration, and metabolism, and by modulating blood pressure. ...
Miosis should not be confused with meiosis, the cellular division process involved in sexual reproduction. ...
Cranial nerves are nerves which start directly from the brainstem instead of the spinal cord. ...
The oculomotor nerve () is the third of twelve paired cranial nerves. ...
The word sympathetic means different things in different contexts. ...
Drugs Atropine blocks muscarinic acetylcholine receptors. Acetylcholine (ACh) is the neurotransmitter of the parasympathetic nervous system and blocking its action means the pupil cannot constrict. Atropine is a tropane alkaloid extracted from the deadly nightshade (Atropa belladonna) and other plants of the family Solanaceae. ...
Amanita muscaria from which muscarine was isolated Acetylcholine - natural agonist of muscarinic and nicotinic receptors. ...
Chemical structure of D-aspartic acid, a common amino acid neurotransmitter. ...
Autonomic nervous system innervation, showing the sympathetic and parasympathetic (craniosacral) systems, in red and blue, respectively The parasympathetic nervous system is one of three divisions of the autonomic nervous system. ...
Cocaine inhibits the reuptake of noradrenaline (aka norepinephrine) within a nerve synapse. When a solution of cocaine is dropped into the eye, noradrenaline is no longer reabsorbed by neurons, and its levels increase. Noradrenaline, the neurotransmitter for the SNS, causes dilation of the pupil. Mydriasis is used as a diagnostic test for Horner's Syndrome, in which it is initiated using a similar mechanism, though cocaine is not usually used in this procedure. Many other drugs such as amphetamines and psychedelic drugs (LSD, psychedelic mushrooms, mescaline, MDMA, Datura stramonium) are also known to cause mydriasis. Cocaine is a crystalline tropane alkaloid that is obtained from the leaves of the coca plant. ...
Norepinephrine, known as noradrenaline outside the USA, is a catecholamine and a phenethylamine with chemical formula C8H11NO3. ...
Illustration of the major elements in a prototypical synapse. ...
Horners syndrome is a clinical syndrome caused by damage to the sympathetic nervous system. ...
Amphetamine or Amfetamine (Alpha-Methyl-PHenEThylAMINE), also known as, beta-phenyl-isopropylamine, and benzedrine, is a prescription stimulant commonly used to treat Attention-deficit hyperactivity disorder (ADHD) in adults and children. ...
Lysergic acid diethylamide, commonly called LSD, LSD-25, or acid. ...
Magic mushrooms are also known as sacred mushrooms, psychedelic mushrooms, and, more generally, hallucinogenic mushrooms. ...
This article does not cite any references or sources. ...
ecstasy and religious ecstasy MDMA, most commonly known today by the street name ecstasy, is a synthetic entactogen of the phenethylamine family whose primary effect is to stimulate the brain to rapidly secrete large amounts of serotonin, causing a general sense of openness, empathy, energy, euphoria, and well-being. ...
Binomial name L. Datura stramonium, also called Jimson Weed, Gypsum Weed, Loco Weed, Jamestown Weed, Thorn Apple, Angels Trumpet, Devils Trumpet, Devils Snare, Mad Hatter, Crazy Tea, Malpitte and Zombies Cucumber is a common weed in the Nightshade Family. ...
Opiate withdrawal can cause dilated pupils in some people. [1] Scoring the poppy pod. ...
Antihistamines and tricyclic antidepressants may cause mydriasis. An antihistamine is a drug which serves to reduce or eliminate effects mediated by histamine, an endogenous chemical mediator released during allergic reactions, through action at the histamine receptor. ...
Chemical structure of the tricyclic antidepressant amitriptyline. ...
Mydriatic drops
Pupil dilated using anaesthetic and muscle relaxant. A mydriatic is an agent which induces dilation of the pupil. Drugs such as tropicamide are used in medicine to permit examination of the retina and other deep structures of the eye, and also to reduce painful ciliary muscle spasm (see cycloplegia). One effect of administration of a mydriatic is intolerance to bright light and is or was sometimes called "drops in eyes". Image File history File links Metadata Size of this preview: 800 Ã 533 pixelsFull resolution (3072 Ã 2048 pixel, file size: 3. ...
Image File history File links Metadata Size of this preview: 800 Ã 533 pixelsFull resolution (3072 Ã 2048 pixel, file size: 3. ...
Dilation in physiological context may mean: pupil dilation (mydriasis) dilation of blood vessels (vasodilation) cervical dilation (or dilation of the cervix) in childbirth Dilation and curettage (surgical dilation) In mathematics: Dilation This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same...
The human eye The pupil is the central transparent area (showing as black). ...
Tropicamide (troe-PIK-a-mide) is an acetylcholine receptor blocker. ...
Cycloplegia is the paralysis of the ciliary muscle, resulting in a loss of accommodation. ...
See also | Pathology of the eye (primarily H00-H59, 360-379) | | Eyelid, lacrimal system and orbit | Stye - Chalazion - Blepharitis - Entropion - Ectropion - Lagophthalmos - Blepharochalasis - Ptosis - Xanthelasma - Trichiasis - Dacryoadenitis - Epiphora - Exophthalmos - Enophthalmos | | Conjunctiva | Conjunctivitis - Pterygium - Pinguecula - Subconjunctival hemorrhage | | Sclera and cornea | Scleritis - Keratitis - Corneal ulcer - Snow blindness - Thygeson's superficial punctate keratopathy - Fuchs' dystrophy - Keratoconus - Keratoconjunctivitis sicca - Arc eye - Keratoconjunctivitis - Corneal neovascularization - Kayser-Fleischer ring - Arcus senilis - Band keratopathy | | Iris and ciliary body | Iritis - Uveitis - Iridocyclitis - Hyphema - Persistent pupillary membrane | | Lens | Cataract - Aphakia | | Choroid and retina | Chorioretinitis - Choroideremia - Retinal detachment - Retinoschisis - Retinopathy (Hypertensive retinopathy, Diabetic retinopathy, Retinopathy of prematurity) - Macular degeneration - Retinitis pigmentosa - Retinal haemorrhage - Central serous retinopathy - Macular edema - Epiretinal membrane - Macular pucker | | Optic nerve and visual pathways | Optic neuritis - Papilledema - Optic atrophy - Leber's hereditary optic neuropathy | Ocular muscles, binocular movement, accommodation and refraction | Paralytic strabismus: Ophthalmoparesis - Progressive external ophthalmoplegia - Palsy (III, IV, VI) - Kearns-Sayre syndrome Other strabismus: Esotropia/Exotropia - Hypertropia - Heterophoria (Esophoria, Exophoria) - Brown's syndrome - Duane syndrome Other binocular: Conjugate gaze palsy - Convergence insufficiency - Internuclear ophthalmoplegia - One and a half syndrome Miosis should not be confused with meiosis, the cellular division process involved in sexual reproduction. ...
Anisocoria is a condition characterized by an unequal size of the pupils. ...
A renal cell carcinoma (chromophobe type) viewed on a hematoxylin & eosin stained slide Pathologist redirects here. ...
For other uses, see Eye (disambiguation). ...
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 or hordeolum is an infection of the sebaceous glands at the base of the eyelashes[1]. While they produce no lasting damage, they can be quite painful. ...
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 which may grow more or less severe during the day. ...
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 Pinguecula is a type of conjunctival degeneration in the eye. ...
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. ...
For other meanings see Snowblind. ...
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. ...
Band keratopathy is a corneal disease derived from the appearance of calcium on the central cornea. ...
In anatomy, the iris (plural irises or irides) is the most visible part of the eye of vertebrates, including humans. ...
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. ...
The references in this article would be clearer with a different and/or consistent style of citation, footnoting or external linking. ...
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. ...
In medicine, Chorioretinitis is an inflammation of the choroid and retina of the eye. ...
Choroideremia is an X-linked recessive retinal degenerative disease that leads to the degeneration of the choriocapillaris, the retinal pigment epithelium, and the photoreceptor of the eye. ...
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...
Retinopathy is a general term that refers to some form of non-inflammatory damage to the retina of the eye. ...
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 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) in media player 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. ...
Retinal haemorrhage is a disorder of the eye in which bleeding occurs into the retina. ...
Central serous retinopathy or CSR is a visual impairment, often temporary, usually in one eye, affecting males in the age group 20 to 50. ...
Macular edema occurs when fluid and protein deposits collect on or under the macula, causing it to thicken and swell. ...
Human eye cross-sectional view. ...
Human eye cross-sectional view. ...
This article is about the anatomical structure. ...
The visual system is the part of the nervous system which allows organisms to see. ...
Optic neuritis, sometimes called retrobulbar neuritis, is the inflammation of the optic nerve that may cause a complete or partial loss of vision. ...
Papilledema is optic disc swelling that is caused by increased intracranial pressure. ...
Optic atrophy is a pathological term and somewhat misleading. ...
Leberâs 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. ...
MRI scan showing lateral and medial rectus muscles. ...
Binocular vision is vision in which both eyes are used together. ...
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. ...
Ophthalmoparesis is a physical finding in certain neurologic illnesses. ...
Progressive external ophthalmoplegia is a disorder of the mitochondria. ...
Damage to the oculomotor nerve, termed oculomotor nerve palsy is known by the down n out symptoms. ...
Fourth nerve palsy is a condition present at birth characterized by a vertical misalignment of the eyes due to a weakness or paralysis of the superior oblique muscle. ...
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. ...
Strabismus (from Greek: ÏÏÏαβιÏμÏÏ strabismos, from ÏÏÏαβίζειν strabizein to squint, from ÏÏÏαβÏÏ strabos squinting, squint-eyed[1]) is a condition in which the eyes are not properly aligned with each other. ...
Person exhibiting esotropia of the right eye Esotropia is a form of strabismus where one or both of the eyes turn inward. ...
Person exhibiting exotropia of the right eye Exotropia is a form of strabismus where the eyes are deviated outward. ...
Hypertropia is a condition of misalignment of the eyes (strabismus), whereby the visual axis of one eye is higher than the fellow fixating eye. ...
Heterophoria is a type of eye condition where the motion of the eyes is not parallel to each other. ...
Esophoria is characterised by inward deviation of the eye usually due to extra-ocular muscle imbalance. ...
This article or section does not cite any references or sources. ...
Browns syndrome is due to fibrous adhesions in the upper medial quadrant of the orbit. ...
An individual diagnosed with Duane syndrome in the left eye. ...
Conjugate gaze palsy refers to an inability of both eyes to move in the same direction at the same time. ...
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. ...
Schematic representation of most common extra-ocular movement abnormality in one and a half syndrome. ...
Refractive error: Hyperopia/Myopia - Astigmatism - Anisometropia/Aniseikonia - Presbyopia | | Visual disturbances and blindness | Amblyopia - Leber's congenital amaurosis - Subjective (Asthenopia, Hemeralopia, Photophobia, Scintillating scotoma) - Diplopia - Scotoma - Anopsia (Binasal hemianopsia, Bitemporal hemianopsia, Homonymous hemianopsia, Quadrantanopia) - Color blindness (Achromatopsia) - Nyctalopia - Blindness/Low vision | | Pupil | Anisocoria - Argyll Robertson pupil - Marcus Gunn pupil/Marcus Gunn phenomenon - Adie syndrome | | Infectious diseases | Trachoma - Onchocerciasis | | Other | Nystagmus - Miosis - Mydriasis - Glaucoma - Floater - Leber's hereditary optic neuropathy - Red eye - Keratomycosis - Xerophthalmia - Aniridia | |