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 ...

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 ...

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 ...

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 ...

Ehlers-Danlos Syndrome (EDS) is a group of inherited (passed in families) disorders that make the body’s connective tissue weaker than normal. Connective ...

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 ...

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 ...

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 ...

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 ...

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 ...

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, ...

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 ...

Dysthyroid optic neuropathy is a serious problem that happens in some people with thyroid eye disease (also called Graves’ orbitopathy). In this condition, the ...

Dysphotopsia means unwanted visual images or disturbances that a person sees, usually after cataract surgery when an artificial lens (intraocular lens, IOL) is ...

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 ...

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, ...