Central corneal thickness (CCT) is the exact thickness of the clear front window of your eye—the cornea—measured at its very center. It is usually written in ...

Terson syndrome means bleeding inside the eye that happens together with bleeding inside the head or a very sudden rise in the pressure inside the skull. ...

Terrien’s marginal degeneration is a rare disease of the cornea, which is the clear front window of the eye. In Terrien’s disease, the outer edge (periphery) ...

A temporary keratoprosthesis is a special, short-term, artificial cornea that a surgeon uses during complex eye surgery when the real cornea is too cloudy to ...

Temporal artery amyloidosis means “amyloid” protein has been laid down in the wall of the superficial temporal artery (the vessel your doctor sometimes ...

Teleophthalmology means “eye care at a distance.” It uses phones, secure messaging, photos, videos, and connected devices to help eye doctors examine, ...

Epicanthus is a skin fold at the inner corner of the eye. This fold runs from the upper eyelid (and sometimes the lower eyelid) toward the side of the nose and ...

Telecanthus means the inner corners of the eyelids (the medial canthi) are farther apart than usual, even though the eyeballs and the bony eye sockets are not ...

Tele-glaucoma is glaucoma care that happens at a distance with the help of digital tools. It uses cameras, scanners, portable eye devices, and secure internet ...

The tegmen is the thin roof bone that separates the air spaces of the middle ear and mastoid from the brain. The part over the middle ear is called the tegmen ...

Tear trough deformity is a hollow or groove that forms between the lower eyelid and the upper cheek. It can make the eyes look tired, sunken, or older than a ...

Tattoo-associated uveitis is inflammation inside the eye that happens in a person who has a tattoo on the skin. The uvea is the middle layer of the eye. It ...

Periocular malignancies are cancers that start in the skin and glands of the eyelid and the skin right next to the eye. This area is small and delicate. The ...

Tanzanian Endemic Optic Neuropathy, often shortened to TEON, is a disease that damages the optic nerves in both eyes. The optic nerves are like thick electric ...

“Tadpole pupil” is a rare, short-lasting change in the shape of one pupil. The round pupil suddenly stretches or pulls at one edge. The pupil looks like a ...

Tacrolimus optic neuropathy is a rare eye nerve problem linked to the medicine tacrolimus. Tacrolimus is a strong anti-rejection drug used after organ and ...

Syphilitic uveitis is eye inflammation caused by the sexually transmitted infection syphilis, which is due to a spiral-shaped bacterium called Treponema ...

Syphilitic keratitis means inflammation of the clear front window of the eye (the cornea) that is caused by the infection called syphilis. Syphilis is an ...

Synovial sarcoma is a rare cancer that starts in soft tissues. It most often grows near large joints in the arms or legs of teenagers and young adults, but it ...

Synechiae means “sticking together.” In the eye, it means parts that should glide smoothly now stick together and will not separate easily. The most common ...