Uveitis-Glaucoma-Hyphema (UGH) syndrome is a complex and potentially blinding ocular condition that usually develops as a complication of cataract surgery, particularly after the implantation of an intraocular lens (IOL). UGH syndrome, first described by Dr. Robert Ellingson in 1978,...
What is uveitis?
Uveitis is a broad term for inflammation of the uveal tract of the eye, which includes the iris, ciliary body, and choroid. These structures work together to provide blood supply to the retina, control the amount of...
Uveitic macular edema (UME) is a common and potentially blinding complication of uveitis, an inflammatory condition that affects the uveal tract of the eye. The uveal tract consists of the iris, ciliary body, and choroid, and inflammation can cause...
What is uveitic glaucoma?
Uveitic glaucoma is a complex and potentially blinding ocular condition that develops as a result of uveitis, an inflammatory disease that affects the uveal tract of the eye. The uveal tract contains the iris, ciliary body,...
Uveal metastasis is the most common type of intraocular malignancy, which occurs when cancer cells from a primary tumor elsewhere in the body spread to the uveal tract in the eye. The three main components of the uveal tract...
What is uveal melanoma?
Uveal melanoma is the most common primary intraocular malignancy in adults, and it develops from melanocytes in the uveal tract of the eye. The uveal tract, which includes the iris, ciliary body, and choroid, is the...
Uveal Effusion Syndrome (UES) is a rare and complicated ocular condition characterized by the accumulation of fluid in the uveal tract, which includes the iris, ciliary body, and choroid. This fluid buildup causes uveal tissue detachment, particularly of the...
Turner Syndrome is a chromosomal disorder that affects about one in every 2,500 live female births and is defined by the partial or complete absence of one of the X chromosomes (45,X karyotype). This genetic condition causes a variety...
Tubulointerstitial Nephritis and Uveitis (TINU) Syndrome is a rare systemic inflammatory condition that affects both the kidneys and the eyes. Tubulointerstitial nephritis (TIN) is an inflammation of the kidney tubules and surrounding interstitial tissue, while uveitis is an inflammation...
The bacterium Mycobacterium tuberculosis causes ocular tuberculosis, a type of extrapulmonary tuberculosis. Tuberculosis (TB) primarily affects the lungs, but it can spread to other parts of the body, including the eyes. Ocular tuberculosis can manifest in a variety of...
Trichiasis is an ocular condition characterized by misaligned eyelashes that grow inward toward the eye rather than outward. This abnormal growth causes the lashes to come into direct contact with the cornea, conjunctiva, or both, causing significant discomfort, irritation,...
Traumatic vitreous hemorrhage is characterized by the presence of blood in the vitreous humor, which is a clear, gel-like substance that fills the space between the eye's lens and retina. This hemorrhage occurs as a direct result of ocular...
Traumatic uveitis is a type of uveitis—a condition marked by inflammation of the uveal tract—caused solely by ocular trauma. The primary structures of the uveal tract are the iris, ciliary body, and choroid. These structures play critical roles in...
Traumatic optic neuropathy (TON) is a serious, vision-threatening condition caused by optic nerve damage from blunt or penetrating trauma to the head or orbit. The optic nerve is an essential component of the visual system, transmitting visual information from...
Traumatic iritis is a type of anterior uveitis that causes inflammation of the iris as a direct result of eye trauma. The iris is the colored part of the eye that regulates the amount of light entering the eye...
What is traumatic glaucoma?
Traumatic glaucoma is a type of secondary glaucoma that develops following an eye injury. Traumatic glaucoma, as opposed to primary glaucoma, develops as a result of a specific ocular trauma. This condition is distinguished by an...
Traumatic endophthalmitis is a severe, sight-threatening intraocular infection that occurs after an open-globe injury that compromises the eye's integrity. This condition is characterized by inflammation of the intraocular tissues, including the vitreous and/or aqueous humor, as a result of...
What is traumatic cataract?
Traumatic cataract is a type of cataract that develops following an eye injury. Unlike age-related cataracts, which typically develop gradually over time as a result of the natural aging process, traumatic cataracts can develop suddenly or...
What is trachoma?
Trachoma is a chronic infectious disease affecting the eye's conjunctiva and cornea caused by the bacterium Chlamydia trachomatis. It is recognized as the leading infectious cause of blindness globally, particularly in impoverished areas with limited access to...
Toxic and nutritional optic neuropathy is a group of disorders that cause damage to the optic nerve as a result of toxins or nutritional deficiencies. The optic nerve, which transmits visual information from the retina to the brain, is...
Thyroid Eye Disease (TED), also known as Graves' orbitopathy or thyroid-associated ophthalmopathy, is an autoimmune condition that primarily affects the tissues surrounding the eyes. It is most commonly associated with Graves disease, an autoimmune condition that causes hyperthyroidism. However,...
What is syphilitic uveitis?
Syphilitic uveitis is an inflammatory condition affecting the uveal tract of the eye caused by the bacterium Treponema pallidum, which is also responsible for the sexually transmitted infection syphilis. The uvea, which consists of the iris,...
Synchysis scintillans is a rare but distinct ocular condition defined by the presence of freely floating, refractile crystals or cholesterol deposits in the eye's vitreous humor. The condition is typically associated with degenerative changes in the vitreous body and...
Sympathetic ophthalmia (SO) is a rare but serious bilateral granulomatous uveitis that develops following eye trauma or surgery. Following a penetrating injury to one eye, known as the "exciting eye," the unaffected eye, known as the "sympathizing eye," develops...
Superior Oblique Myokymia (SOM) is a rare and usually harmless ocular condition characterized by spontaneous, involuntary, and episodic contractions or twitching of the superior oblique muscle, which is one of the extraocular muscles that control eye movement. The superior...
Definition of Lens Subluxation
Subluxation of the lens, also known as ectopia lentis, is an ocular condition characterized by the partial dislocation or displacement of the eye's natural lens from its normal position inside the eye. The lens is a...
A subconjunctival hemorrhage is a common and usually harmless ocular condition characterized by the sudden appearance of a bright red or dark red patch on the white part of the eye (sclera). A small blood vessel bursts, leaking blood...
Styes, also known as hordeolums, are a common and often painful eyelid condition. It develops when one of the small oil glands near the base of the eyelashes or within the eyelid becomes infected or inflamed, resulting in a...
What is strabismus?
Strabismus, also known as "crossed eyes" or "wandering eyes," is a condition in which the eyes do not line up properly and point in different directions. One eye may look straight ahead, while the other looks inward,...
What is Strabismic Amblyopia?
Strabismic amblyopia, also known as "lazy eye," is a type of amblyopia in which one eye is favored over the other due to strabismus, or eye misalignment. This condition causes reduced visual acuity in the misaligned...
