Iris Retraction Syndrome (often shortened to IRS) is a rare eye condition. In plain terms, it means the colored part of the eye (the iris) bends backward ...

Iris melanoma is a cancerous growth made from pigment cells (called melanocytes) in the iris, the colored ring at the front of your eye. These melanocytes ...

An iris cyst is a small, thin-walled, fluid-filled sac that forms in or behind the iris. Most iris cysts are benign (non-cancerous). Many cause no trouble and ...

An iris AVM is an abnormal shortcut (shunt) between an iris artery and an iris vein. Instead of blood flowing from arteries → tiny capillaries → veins, the ...

“Iris and ciliary body metastasis” means a cancer from somewhere else in the body has spread to the front part of the eye. The iris is the colored ring that ...

Iridoschisis is a rare eye condition where the colored part of your eye (the iris) literally splits into two layers. The thin front layer of the iris weakens, ...

Secondary glaucoma means glaucoma that happens because of another eye problem, a disease elsewhere in the body, a drug, or an injury. In simple words: the ...

Primary glaucoma is a group of eye diseases that slowly injure the optic nerve without another eye problem causing it (that’s why we call it “primary”). The ...

ICE syndrome is a rare eye condition where a thin cell layer on the back of the cornea (the corneal endothelium) starts acting abnormally. These cells creep ...

Your cornea is the clear front window of the eye. It has a smooth dome shape and steady thickness so it can bend (focus) light properly. Ectasia means abnormal ...

Iodine” is a natural trace mineral that your thyroid and every cell in your body needs to live. Because iodine is tiny and essential, the immune system does ...

An inverted papilloma is a non-cancerous (benign) growth made of the lining cells of the nose and nearby drainage passages. When it grows inside the lacrimal ...

Inverse Bell’s Phenomenon is a rare eye movement problem that happens when you try to close your eyes.Normally, when we close our eyes — especially tightly — ...

Invasive fungal infection of the orbit and sinuses” means a fungus has moved past the surface lining of the nose and sinus cavities, grown into the deeper ...

Intumescent cataract means a swollen cataract. The natural lens inside the eye takes up extra water (fluid) and thickens. Because the lens is thicker and ...

Intravascular Papillary Endothelial Hyperplasia (IPEH) is a benign (non-cancerous) growth that forms inside a blood vessel. It appears when the inner lining ...