Skew deviation is a vertical eye misalignment that comes from a problem in the balance system in the brain. One eye sits higher and the other eye sits lower, ...

Sinusitis-induced optic neuropathy means the optic nerve is damaged because of disease in the nearby sinuses. The optic nerve is the cable that carries visual ...

Sinonasal undifferentiated carcinoma, or SNUC, is a very aggressive cancer that begins in the lining of the nose and the air-filled spaces around the nose ...

A simultaneous bilateral cataract means both lenses of your eyes become cloudy at the same time or close to the same time. The lens is the clear, flexible part ...

Simultanagnosia is a problem with visual attention. A person can see one thing at a time, but cannot see the “whole picture” when many things appear together. ...

Limbal epithelial disease means there is a problem in the thin, living skin-like layer that covers the front window of the eye near the edge where the clear ...

Silicone oil keratopathy means damage and disease of the clear front window of the eye, called the cornea, that happens after silicone oil is used inside the ...

Silent Sinus Syndrome (SSS) happens when one maxillary sinus (the air space under your eye) slowly collapses inward because its natural drainage/airflow ...

Silent Brain Syndrome is a rare eye-orbit condition that usually appears years after a child has been treated for hydrocephalus with a ventriculo-peritoneal ...

Elschnig spots are tiny, round marks that an eye doctor can see on the back of the eye when the pupil is dilated and the retina is examined. Each spot is a ...

Siegrist streaks are thin, straight lines of dark pigment that you can see in the back of the eye when a doctor looks with a dilated exam. The lines sit over ...

Siderosis means iron builds up inside body tissues and stays there as tiny brown particles called hemosiderin, which is iron stored in a safe but heavy form. ...

Sickle cell retinopathy is an eye disease that happens in people who carry sickle hemoglobin in their red blood cells. In sickle cell disease, red blood cells ...

Sickle cell maculopathy is damage in the center of the retina called the macula that happens in people who have sickle cell disease. The macula is the tiny ...

Seasonal Hyperacute Pan-Uveitis (SHAPU) is a very sudden and very strong inflammation inside the eye. “Pan-uveitis” means the inflammation involves the whole ...

Abusive Head Trauma is a serious brain injury in a baby or young child. It happens when a caregiver violently shakes a child, hits the head, throws the child, ...

Seven Rings of Trauma” is an eye-trauma concept used mostly in ophthalmology. It describes seven circular (ring-like) tissues in the front half of the eye that ...

Serpiginous choroidopathy is a rare inflammation in the back of the eye. It mainly involves three layers: the choroid (the blood-rich layer under the retina), ...

Seronegative myasthenia gravis is a long-term immune system disease that makes muscles weak and tired. It affects the place where nerves talk to muscles. This ...

Periorbital malignancy means a cancer that starts in the skin of the eyelid or the tissues right next to the eye. It can grow on the upper or lower eyelid, in ...