Tuberculosis uveitis (often called ocular TB) is inflammation inside the eye that happens when your immune system reacts to germs from Mycobacterium ...

Trochleitis means inflammation around the trochlea, the tiny pulley of cartilage at the inner-upper corner of the eye socket where the superior oblique tendon ...

Trisomy 21, commonly called Down syndrome, is a genetic condition where a person has three copies of chromosome 21 in their cells instead of the usual two. ...

Trisomy 13—also called Patau syndrome—is a genetic condition in which a person has three copies of chromosome 13 in their cells instead of the usual two. ...

Trigeminal trophic syndrome is a rare skin and nerve disorder that appears after damage to the trigeminal nerve (the 5th cranial nerve that carries feeling ...

A trifocal intraocular lens (IOL) is a clear, foldable lens implant placed inside your eye during cataract surgery (or sometimes refractive lens exchange when ...

A trichilemmoma is a benign (non-cancerous) skin growth that comes from the outer root sheath of a hair follicle—the sleeve of cells around the hair inside the ...

Trichiasis means the eyelashes grow or point the wrong way and touch the eye surface. In simple words, the lashes that should point outward toward the air are ...

Triangle symbol on the eye is almost always a pterygium (pronounced tuh-RIJ-ee-um): a triangular, wing-shaped, fleshy growth that starts on the white part of ...

Trematode-Induced Uveitis (TIU) is eye inflammation caused by trematodes, which are parasitic flatworms (“flukes”). In certain regions, especially in rural ...

Treacher–Collins syndrome (TCS) is a genetic condition that mainly affects how the bones and soft tissues of the face grow before birth. The first and second ...

Traumatic Optic Neuropathy means damage to the optic nerve—the cable that carries visual signals from the eye to the brain—caused by injury. The injury can be ...

A traumatic motor neuropathy is an injury to a nerve that primarily carries motor signals—the messages that tell muscles to contract—caused by some form of ...

A traumatic macular hole is a small, round opening that goes through the full thickness of the central retina (the macula) after an injury to the eye. The ...

Traumatic lens dislocation means the natural lens of the eye has been knocked out of its normal position by an injury. The lens is a clear, flexible structure ...

Traumatic iritis means inflammation inside the front of the eye (mainly the colored ring called the iris, and sometimes the nearby ciliary body) after an ...

Traumatic Horner Syndrome happens when the “fight-or-flight” nerve supply to one eye and the same side of the face is interrupted somewhere along a long ...

Traumatic globe luxation means the eyeball is pushed or pulled out of its normal place in the bony eye socket after a force or injury. In a healthy eye, the ...

Traumatic glaucoma is high pressure inside the eye that happens after an eye injury. The injury can be a strong hit to the eye, a cut or puncture, a burn, or a ...

A traumatic cataract is a clouding of the eye’s natural lens that starts after an injury to the eye. The lens sits just behind the colored part of the eye (the ...