Dry Eye Syndrome (also called Dry Eye Disease or DED) is a common condition where the front surface of the eye does not stay properly wet. Tears are needed to ...

Dry eye in Sjögren’s syndrome is a condition where the eyes become very dry, uncomfortable, and sometimes damaged because a person’s immune system attacks the ...

Drug-induced corneal disease means damage to the clear front part of the eye (the cornea) caused by medicines. These drugs can be taken by mouth, injected, or ...

Drug-induced acute angle closure glaucoma (DI-AACG) is a sudden, serious eye problem caused by certain medications. In this condition, the angle between the ...

Uveitis means inflammation inside the eye, especially of the uveal tract (the iris, ciliary body, and choroid), but the inflammation can involve other parts ...

Drug-induced maculopathy means damage to the macula—the central part of the retina that gives us sharp, detailed vision—caused by medications or systemic ...

Cataract means the natural lens inside the eye becomes cloudy, so light cannot pass clearly and vision becomes blurred, dim, or distorted. It usually happens ...

Doyne Honeycomb Retinal Dystrophy (DHRD), also known as Malattia Leventinese or Familial Dominant Drusen, is a rare inherited eye disease that slowly damages ...

Lymphedema-Distichiasis Syndrome (LDS) is a rare inherited condition in which two main problems appear together: lymphedema (swelling, usually of the legs, ...

A Dome-Shaped Macula (DSM) is a special shape change in the central part of the retina (the macula) where, instead of being flat or slightly concave, it bulges ...

Distichiasis is a condition where a person has an extra row of eyelashes. Instead of the normal single line of lashes at the lid margin, there is a second row ...

An intraocular lens (IOL) is an artificial lens implanted inside the eye to replace the eye’s natural lens, most commonly during cataract surgery. A dislocated ...

Glaucoma is a group of eye diseases that slowly damage the optic nerve, usually by pressure or reduced blood flow inside the eye. When the optic nerve is ...

The superior ophthalmic vein (SOV) is the main vein that drains blood from the eye and the tissues around the eye back toward the brain. When this vein becomes ...

Diffuse Unilateral Subacute Neuroretinitis (DUSN) is a rare eye infection caused when a tiny worm (a nematode) gets into the layers under the retina of one eye ...

Diffuse Lamellar Keratitis (DLK) is a sterile (non-infectious) inflammatory condition that affects the cornea after lamellar refractive surgeries such as ...

A visual hallucination is when a person sees something that is not actually there. It is a perception with no external visual stimulus — for example, seeing ...

Dry Eye Disease (DED) is not just “dry eyes” like when you are tired—it is a long-lasting problem of the front surface of the eye. According to the ...

Optic neuritis means the optic nerve—the nerve that carries vision signals from the eye to the brain—becomes inflamed. This inflammation can damage the nerve ...

Diabetic retinopathy is an eye disease that happens when long-term high blood sugar from diabetes damages the tiny blood vessels in the retina, the ...