- P -
Papilledema
Non-inflammatory swelling/elevation of the optic nerve often due to increased intracranial pressure or space-occupying tumor
Photophobia
Sensitivity to light
Photorefractive keratectomy
PRK: a surgical procedure using an excimer laser to remove corneal tissue to effect an alteration of the refractive error
Pingecula
A (usually) irritation caused degeneration of the conjunctiva resulting in a thickening and yellowing of the normally thin transparent tissue
Posterior optical segment
The part of the eye posterior (behind) to the crystalline lens, including the vitreous, choroid retina and optic nerve
Posterior Vitreous Detachement (PVD)
The separation of the vitreous body from it1s attachment from the retinal surface due to shrinkage from degenetative or inflamatory conditions or trauma. Also an age-related condition
Presbyopia
A condition in which the accommodative system fails to allow for the focusing of near objects, resulting from age-related changes in the crystalline lens or cilliary muscle
Pupil
The center hole in the iris through which light must pass to reach the back of the eye.
Pupillary response
The constriction and dilation of the pupil due to stimulation by light or accommodation
|