Empty Sella Syndrome (ESS)
Empty Sella Syndrome (ESS) is a condition seen on brain imaging where the bony cavity called the sella turcica—which normally holds and protects the pituitary gland—appears to be empty or partly ...
Rx Eye & Vision Care (A – Z)
Ocular Adnexa Diseases
The ocular adnexa are the tissues around the eyeball that support, protect, or move it. This includes the eyelids, the lacrimal (tear) apparatus (glands and drainage system), the orbit (the bony ...
Elschnig Pearls
Elschnig pearls are clusters of regenerating lens epithelial cells that form after cataract surgery on the posterior (back) capsule of the lens. They are a regenerative type of posterior capsule ...
Elevated Intraocular Pressure
Elevated intraocular pressure (IOP) means that the fluid pressure inside the eye is higher than normal. The eye maintains its shape and internal environment by balancing the production and drainage ...
Elevated Episcleral Venous Pressure
Every eye makes a clear fluid called aqueous humor. This fluid drains out through channels that eventually empty into the episcleral veins, small veins on the white of the eye. The pressure inside ...
Eight-and-a-Half Syndrome
Eight-and-a-Half Syndrome is a rare neurological condition caused by a small but specific injury in the back (dorsal) part of the pons, which is a section of the brainstem. The name comes from ...
Ehlers-Danlos Syndrome
Ehlers-Danlos Syndrome (EDS) is a group of inherited (passed in families) disorders that make the body’s connective tissue weaker than normal. Connective tissue is like the glue and scaffolding that ...
Eczema Herpeticum
Eczema herpeticum is a serious skin infection caused by the herpes simplex virus (mostly HSV-1, sometimes HSV-2) that spreads rapidly over areas of broken or inflamed skin, especially in people who ...
Ectropion
Ectropion is a condition where the eyelid, most often the lower eyelid, turns outward away from the eyeball instead of sitting gently against it. Because the eyelid no longer touches the eye ...
Ectopia Lentis
Ectopia lentis means that the natural lens inside the eye is out of its normal place. Normally, the lens sits behind the pupil, held in place by tiny fibers called zonules. When those supporting ...
Ectasia after LASIK
Ectasia after LASIK is a rare but serious problem where the cornea (the clear front window of the eye) becomes weaker, thinner, and bulges outward after laser vision correction surgery. This change ...
Eccrine Sweat Gland Carcinoma
Eccrine sweat gland carcinoma is a very rare type of skin cancer that starts in the eccrine sweat glands—the glands all over the body that make watery sweat to help cool the skin. This cancer grows ...
Eccrine Hidrocystomas
Eccrine hidrocystomas are harmless, small fluid-filled cysts that form when sweat produced by the eccrine glands gets trapped and builds up in the duct, causing a blister-like swelling just under ...
Eales Disease
Eales Disease is a rare eye condition that mainly affects the small veins in the outer (peripheral) part of the retina, the light-sensing layer at the back of the eye. It usually happens in young ...
Dysthyroid Optic Neuropathy
Dysthyroid optic neuropathy is a serious problem that happens in some people with thyroid eye disease (also called Graves’ orbitopathy). In this condition, the optic nerve—the nerve that carries ...
Dysphotopsia
Dysphotopsia means unwanted visual images or disturbances that a person sees, usually after cataract surgery when an artificial lens (intraocular lens, IOL) is placed inside the eye. These are not ...
Ocular Dysmorphology Syndromes
Dysmorphology syndromes in the eye means conditions where the eye's shape, structure, or parts develop in an unusual or abnormal way, often from birth. These differences can affect just the eye or ...
Dyslexia
Dyslexia is a learning difference that mainly affects a person’s ability to read, spell, and sometimes write. It is not a sign of low intelligence. Instead, people with dyslexia have brains that ...
Dysembryoplastic Neuroepithelial Tumors (DNET)
A dysembryoplastic neuroepithelial tumor (DNET) is a rare, slow-growing, benign (WHO grade 1) brain tumor that arises from cortical tissue and contains both neuronal and glial elements. It most often ...
Dupilumab-Induced Conjunctivitis
Dupilumab-induced conjunctivitis is an inflammation of the eye’s conjunctiva (the clear tissue covering the white part of the eye and the inside of the eyelids) that starts after a person begins ...
