Secondary angle-closure glaucoma means the natural drainage angle of the eye (the space where the iris meets the cornea) gets closed because of another ...

Primary vitreoretinal lymphoma is a cancer of immune cells called lymphocytes that starts inside the eye, mainly in the vitreous gel (the clear jelly that ...

Primary orbital liposarcoma is a rare cancer that starts inside the eye socket (the orbit) in the body’s fat tissue. The orbit is a tight, bony space that ...

Primary localized conjunctival amyloidosis means abnormal protein material called amyloid slowly builds up only in the thin pink tissue that lines the eyelids ...

Primary Congenital Glaucoma is a glaucoma that starts in early life, usually from birth to the first few years. In PCG, the natural “drain” inside the eye (the ...

Primary central nervous system vasculitis is inflammation of blood vessels that are only inside the brain and spinal cord. The word “primary” means the ...

Presumed Ocular Histoplasmosis Syndrome (POHS) is an eye condition that leaves tiny “punched-out” scars in the retina and the layer under it (the choroid). ...

Preseptal cellulitis (also called periorbital cellulitis) is an infection of the eyelid and the soft skin around the eye. The infection sits in front of a thin ...

Presbyopia is the slow loss of near focusing power that happens to almost everyone as we get older. In a young eye, a soft and flexible natural lens sits ...

Presbyopia is a normal change that happens to almost everyone as they get older. The clear lens inside the eye slowly becomes stiffer and less flexible with ...

Eclampsia-associated retinopathy means eye and retina problems that happen because of very high blood pressure and body-wide blood vessel stress during ...

Preeclampsia is a pregnancy problem where new high blood pressure starts after 20 weeks and there are signs that the mother’s organs are under stress (like the ...

This phrase means what to do before an eye specialist (ophthalmologist) sees the patient. It includes the very first steps at home, in the field, in an ...

Prader–Willi syndrome is a genetic condition that affects many parts of the body. In the first months of life, most babies with PWS have very low muscle tone ...

Pourfour du Petit syndrome is a rare problem of the sympathetic nerves to the eye and face. The key signs are a large pupil (mydriasis), upper eyelid pulled up ...

Pott puffy tumour is not a cancer. It is a serious infection that causes a soft, puffy lump on the forehead. The lump forms because pus collects under the ...

Postoperative decompensated strabismus means a hidden eye misalignment (a “phoria”) becomes obvious (a “tropia”) after eye surgery, so the two eyes no longer ...

Posterior vitreous detachment (PVD) is a very common eye change that happens as we get older. Inside the eye there is a clear gel called the vitreous. This gel ...

Posterior Polymorphous Corneal Dystrophy (PPCD) is a rare, usually inherited eye condition that affects the innermost layer of the cornea (the clear front ...

A posterior polar cataract is a cloudy spot that sits right in the center of the back surface of your eye’s natural lens. Because it is exactly on the visual ...