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Herpes Zoster Optic Neuritis is a rare but serious inflammation of the optic nerve caused by reactivation of the varicella-zoster virus (VZV)—the same virus that causes...
Herpes Zoster Uveitis is an eye condition in which the varicella-zoster virus (VZV)—the same virus that causes chickenpox and shingles—reactivates and inflames the uveal tract (iris,...
Hidradenitis suppurativa (HS) is a long-lasting skin disease. It causes painful lumps, boils, and “tunnels” under the skin. These bumps happen where skin rubs together, like...
High altitude retinopathy (HAR) is an eye condition that arises when people ascend to high elevations—usually above 2,500 m (about 8,200 ft)—and experience low air pressure...
High myopia is a severe form of nearsightedness (myopia) in which distant objects appear very blurry while close objects remain clear. In technical terms, it is...
High Tension Glaucoma/Glaucoma is a chronic, degenerative optic neuropathy that can be distinguished from most other forms of acquired optic neuropathy by the characteristic appearance of...
HIV-associated facial lipoatrophy is a condition in which people living with HIV lose fat in their faces. This can make cheeks look hollow, temples appear sunken,...
HLA-B27-Associated Acute Anterior Uveitis (HLA-B27 AAU) is a sudden inflammation of the front part of the eye—the iris (colored part) and ciliary body (just behind the...
Synophthalmia is an extremely rare and severe birth defect in which the two eyes are fused into one or are so closely set that they appear...
Homocystinuria (pronounced “home-oh-sis-tin-YOOR-ee-uh”) is a genetic disorder. It happens when one of the enzymes needed to break down homocysteine—an intermediate in methionine metabolism—is missing or not...
Hordeolum is a common problem involving the eye seen in both primary and urgent care setting. It is a painful, acute infectious process of the upper...
Horner syndrome is a condition that happens when the nerve pathway that controls certain eye and facial functions is damaged. This pathway is called the oculosympathetic...
