Fulminant idiopathic intracranial hypertension (FIH) is a rare, rapidly progressive form of idiopathic intracranial hypertension (IIH). In IIH, cerebrospinal fluid (CSF) pressure rises inside the ...
Fuchs’ Endothelial Dystrophy is a condition of the cornea, the clear “window” at the front of the eye. In this disorder, the innermost layer of the cornea—called the endothelium—slowly loses cells or ...
Fuchs’ Superficial Marginal Keratitis (FSMK) is a rare eye disease that affects the outer edge of the clear front window of the eye (the cornea). In FSMK, the body’s immune system causes repeated, ...
Fuchs heterochromic iridocyclitis (FHI) is a rare, chronic form of anterior uveitis—an inflammation of the front part of the eye—that most often affects only one eye. It was first described by Ernst ...
A frontocutaneous fistula is an abnormal tunnel that runs from the frontal sinus (located behind your forehead) through bone and soft tissue to the skin surface. Instead of mucus and air draining ...
Froin syndrome is a rare neurological sign characterized by the triad of cerebrospinal fluid (CSF) xanthochromia (yellow discoloration), markedly elevated CSF protein levels, and a tendency for the ...
Friedreich ataxia is a rare inherited disease that damages parts of the nervous system and heart. It makes it hard to walk, harms muscle coordination, and can lead to heart problems. The root cause ...
Foville Syndrome is a rare brainstem condition caused by a lesion—usually in the dorsal (back) part of the pons in the brainstem—that damages certain nerve centers and pathways. The classic form ...
The fovea is a tiny pit in the center of the retina (the back of the eye) that gives us very sharp central vision—what we use to read, recognize faces, and see fine detail. In normal development, the ...
Foster-Kennedy Syndrome is a rare neurological and eye-related condition where one eye shows optic atrophy (a pale, shrunken optic nerve indicating long-standing damage) while the opposite eye has ...
The Foldable Capsular Vitreous Body (FCVB) is a medical device made to replace the natural gel (the vitreous) inside the back part of the eye when that gel is lost, damaged, or when the eye is badly ...
A focal scleral nodule is a small, round, benign lump that grows from the white outer coat of the eye called the sclera. It usually looks yellowish or white, is slightly raised, and is most often ...
Focal Choroidal Excavation (FCE) is a small, deep pit or depression in the choroid layer of the eye that is seen most clearly with detailed imaging, especially optical coherence tomography (OCT). It ...
Floppy Eyelid Syndrome (FES) is an eye condition where the upper eyelid becomes too loose and stretchy. Because the eyelid is very soft and lax, it can flip inside out easily, especially during ...
Fleck Corneal Dystrophy (FCD) is a rare inherited eye condition that affects the clear front part of the eye called the cornea, specifically the middle layer known as the stroma. In FCD, many small, ...
Firework and shrapnel eye injuries are serious and can cause permanent loss of vision if not recognized and treated quickly. These injuries happen when explosive devices or broken pieces of material ...
A firearm ocular injury means that a gun or projectile has caused damage to the eye, the tissues around the eye (the orbit), or the visual pathways. These injuries happen when a bullet, bullet ...
Fingolimod-Associated Macular Edema is swelling in the center of the retina (the macula) that happens as a side effect of taking the drug fingolimod, which is used to treat relapsing forms of ...
Filamentary keratitis is a painful eye condition in which thread-like strands (called filaments) form and stick to the surface of the cornea, the clear front window of the eye. These filaments are ...
Fibrous histiocytoma is a name doctors give to a group of tumors that arise from cells in the skin or soft tissues that look like a mix of fibroblasts (cells that make connective tissue) and ...
