Home Blog
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...
Stickler Syndrome is a hereditary connective tissue disorder that affects several systems in the body, including the eyes, ears, skeleton, and craniofacial structures. Stickler Syndrome, named after pediatrician Dr. Gunnar B. Stickler, who described the condition in 1965, is...
Stevens-Johnson Syndrome (SJS) is a serious, potentially fatal condition that primarily affects the skin and mucous membranes, including the eyes. It is distinguished by a hypersensitive reaction that can be induced by a variety of medications, infections, or other...
Squamous cell carcinoma (SCC) of the eyelid is a malignant tumor caused by squamous cells, which are flat, thin cells found in the epidermis, or outermost layer of skin. This type of skin cancer is the second most common...
What is Solar Retinopathy (SR)?
Solar retinopathy is an ocular condition caused by direct exposure of the retina to intense sunlight, especially when viewing the sun without proper eye protection. This condition is most commonly associated with solar eclipses, in...
Stickler Syndrome is a hereditary connective tissue disorder that affects several systems in the body, including the eyes, ears, skeleton, and craniofacial structures. Stickler Syndrome, named after pediatrician Dr. Gunnar B. Stickler, who described the condition in 1965, is...
Stevens-Johnson Syndrome (SJS) is a serious, potentially fatal condition that primarily affects the skin and mucous membranes, including the eyes. It is distinguished by a hypersensitive reaction that can be induced by a variety of medications, infections, or other...
Squamous cell carcinoma (SCC) of the eyelid is a malignant tumor caused by squamous cells, which are flat, thin cells found in the epidermis, or outermost layer of skin. This type of skin cancer is the second most common...
What is Solar Retinopathy (SR)?
Solar retinopathy is an ocular condition caused by direct exposure of the retina to intense sunlight, especially when viewing the sun without proper eye protection. This condition is most commonly associated with solar eclipses, in...
Sjögren's syndrome is a chronic autoimmune disease characterized by lymphocytic infiltration and destruction of exocrine glands, particularly the salivary and lacrimal glands, which causes dry mouth (xerostomia) and dry eyes (keratoconjunctivitis sicca). Although Sjögren's syndrome can affect multiple organs,...
Sickle cell retinopathy is a vision-threatening complication of sickle cell disease (SCD), a genetic disorder that alters the structure and function of hemoglobin, the protein in red blood cells that transports oxygen throughout the body. In sickle cell disease,...
Serpiginous choroiditis, also known as serpiginous chorioretinopathy, is a rare, chronic, and progressive inflammatory disease affecting the choroid and retinal pigment epithelium (RPE) of the eye. Serpentine or snake-like lesions spread from the optic disc across the retina, causing...
What is secondary glaucoma?
Secondary glaucoma is a broad category of eye conditions distinguished by elevated intraocular pressure (IOP) due to a known cause or underlying pathology. Secondary glaucoma, as opposed to primary glaucoma, usually develops as a result of...
What is secondary cataract?
Secondary cataract, also known as posterior capsule opacification (PCO), is a common complication that can develop following cataract surgery. While the term "secondary cataract" may imply the formation of a new cataract, it actually refers to...
Definition of Secondary Acquired Lacrimal Duct Obstruction
Secondary acquired lacrimal duct obstruction (SALDO) is a condition in which the lacrimal drainage system becomes clogged due to external factors such as trauma, surgery, inflammation, infection, or tumors. In contrast to primary...
