Pigmented Paravenous Retinochoroidal Atrophy (PPRCA) is a rare eye condition. In this condition, clumps of black or brown pigment collect along the paths of ...

Pigment Dispersion Syndrome is an eye condition where tiny grains of natural color (called pigment) rub off the back of the iris, which is the colored part of ...

Pigmentary glaucoma is a type of open-angle glaucoma that happens when tiny particles of brown pigment rub off the back surface of your iris (the colored part ...

Pigment epithelial detachment, or PED, happens when a very thin layer at the back of the eye, called the retinal pigment epithelium (RPE), lifts up from the ...

Astigmatism means the eye does not focus light evenly in all directions. One main direction (meridian) of the eye bends light a little more or a little less ...

Phthisis bulbi means an eye has become shrunken, scarred, and permanently blind after severe damage or long-standing disease. It is usually irreversible. Care ...

Photorefractive Intrastromal Cross-Linking, usually shortened to PiXL, is a non-incisional eye procedure that uses special eye drops (riboflavin, a form of ...

Photokeratitis is a painful, sudden sunburn of the clear front window of the eye, called the cornea. It happens when the cornea is exposed to too much ...

Photo-oculodynia means your eyes feel real pain when exposed to ordinary light (for example, indoor light or daylight), even when the eye exam can look almost ...

PACK-CXL is a light-based treatment used on the cornea (the clear front window of the eye) when there is a corneal infection (infectious keratitis). Doctors ...

Phlyctenular keratoconjunctivitis (PKC) is an eye condition where the body’s immune system overreacts to germs or germ-related proteins and creates a small ...

Mydriasis means the pupil is larger than normal. The pupil is the black hole in the center of the eye. It looks like a hole, but it is really an opening that ...

Your pupil is the black circle in the center of your eye. It is a round opening in your iris (the colored part). The pupil is like a camera aperture. It gets ...

A solitary fibrous tumor (SFT) is a rare growth that starts from the body’s connective tissue (the “fibrous” framework that supports organs).It can grow in ...

Glomangiopericytoma is a rare, usually low-grade tumor that grows from perivascular (around-blood-vessel) muscle-like cells in the nasal cavity or nearby ...

Hemangiopericytoma/solitary fibrous tumor is a rare tumor that starts from cells around small blood vessels. Today, doctors usually call these tumors “solitary ...

Zimmerman’s tumor” is an older, informal name for hemangiopericytoma—a very vascular soft-tissue tumor that was first described as a growth made of ...

Phakomatous choristoma is a very rare, benign (non-cancerous) growth made of lens-like tissue that develops in the wrong place, most often at the inner, lower ...

Pseudophacocele means that an artificial lens implant (an intraocular lens, or IOL) that was put inside the eye during cataract surgery has been pushed out of ...

A phacocele is a rare eye injury where the natural lens of the eye gets pushed out of its normal position and ends up under the conjunctiva (the thin, clear ...