Retinoschisis is a change inside the retina, which is the light-sensing “film” at the back of the eye. In retinoschisis, the retina splits into two layers. A ...

Foveomacular retinoschisis is a problem in the center of the retina. The retina is the thin, light-sensing layer at the back of your eye. The very center of ...

Idiopathic foveomacular retinoschisis is a retinal splitting problem that happens at the very center of sight. The center of sight is called the fovea. The ...

Stellate Nonhereditary Idiopathic Foveomacular Retinoschisis (SNIFR) is a pattern of “splitting” inside the macula, the central part of the retina that gives ...

Stellate multiform amelanotic choroidopathy (SMACH) is a newly described change in the choroid (the vascular layer under your retina). Doctors see a ...

The stellate ganglion is a small “relay station” of the sympathetic nervous system in the lower neck/upper chest, made by the fusion of the inferior cervical ...

Fundus flavimaculatus is an eye condition that slowly harms central vision. It usually starts in childhood, the teenage years, or young adult life, but it can ...

Staphyloma is an eye condition where part of the outer layer of the eyeball (called the sclera or cornea) becomes stretched, thinned, and bulges outward. This ...

Squamous carcinoma of the eyelid is a skin cancer that starts in the squamous cells. These are the flat cells on the surface of the skin and the eyelid margin. ...

Spontaneous intracranial hypotension means the pressure of the fluid that bathes your brain and spinal cord—the cerebrospinal fluid (CSF)—falls lower than it ...

Spheroidal degeneration is a slow, wear-and-tear change on the clear front window of the eye called the cornea. In this condition, tiny round droplets made ...

A sphenoid wing meningioma is a tumor that starts in the thin membrane that lines the inside of the skull (the meninges) along the sphenoid wing, a bony ridge ...

Spasmus nutans is a rare eye movement problem that usually begins in early infancy. It has three main features. The first feature is very fast, very small, ...

Spasm of the Near Synkinetic Reflex is a condition where the eyes act as if they are always looking at something very close, even when the person is trying to ...

Spaceflight-Associated Neuro-Ocular Syndrome, or SANS, is a set of eye and optic nerve changes that can develop during long space missions. In simple terms, ...

Sorsby macular dystrophy is a rare, inherited eye disease that damages the macula, which is the central part of the retina that you use for sharp, ...

A solitary fibrous tumor (SFT) is a lump that grows from supporting (connective) tissue cells. These cells make fibers such as collagen, so the tumor often ...

Solar retinopathy is an eye injury that happens when very strong light from the sun enters the eye and hurts the most sensitive part of the retina called the ...

Soemmering’s ring is a circular build-up of leftover lens cells and lens material that forms around the rim of the natural lens capsule after cataract surgery ...

Slit Ventricle Syndrome (SVS) is a problem that can happen in people who have a brain shunt for hydrocephalus. A shunt is a thin tube that drains extra fluid ...