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Pupil
Pupil A circular opening in the center of the iris. The size of the pupil changes according to the amount of light present. It is small in sunlight and large in a dark room.
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Iris
The colored part of the eye with a hole (pupil) in the center. It regulates the amount of light entering the eye – the dimmer the lighting the more light the iris lets into the eye by widening the pupil.
Pupil
A circular opening in the center of the iris. The size of the pupil changes according to the amount of light present. It is small in sunlight and large in a dark room.
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Photophobia
Severe discomfort to bright lights. Usually a symptom of eye disease, such as glaucoma, in an infant or retinal disease in a child or adult. Sometimes treated with dark sunglasses.
PRK
PRK stands for Photo Refractive Keratectomy which is a form of refractive surgery to correct a refractive error such as myopia. A laser is used to remove a front layer of cells of the cornea to change the refractive state of the eye so that glasses are no longer needed. Complications include under or over correction of the refractive error and glare problems, particularly at night with oncoming head lights. If serious infection occurs, blindness might result.
Pseudostrabismus
A child's eyes appear to be out-of-alignment, and usually one eye appears to turn in. In infants this appearance is especially noticeable when there is excessive skin on either side of the nose that covers the inner corner of each eye. As the child looks to one side, part of the eye disappears under this skin and looks crossed. This condition is common in Asian - Americans.
Pterygium
A triangular membrane with blood vessels which grows from the sclera toward the occasionally onto the cornea. It occurs more often on the nasal side of the eye. It is more common in dusty and windy climates. Surgery is often necessary.
Ptosis
A drooping of the upper eyelid. In children it is usually a congenital problem. It rarely causes amblyopia. Most children simply hold their heads back if the droop is severe. Surgery, the only treatment, is usually suggested prior to starting school when the appearance is cosmetically unacceptable.
Pupil
Paxil
Paroxetime: a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade name Paxil).
Psoriasis treatment
A particular set of medical actions and interventions aimed at fighting a patient's psoriasis condition.
Phobias
Anxiety disorders in which the essential feature is persistent and irrational fear of a specific object, activity, or situation that the individual feels compelled to avoid. The individual recognizes the fear as excessive or unreasonable.
Polio
An acute infectious disease of humans, particularly children, caused by any of three serotypes of human poliovirus. Usually the infection is limited to the gastrointestinal tract and nasopharynx, and is often asymptomatic. The central nervous system, primarily the spinal cord, may be affected, leading to rapidly progressive paralysis, coarse fasciculation and hyporeflexia. Motor neurons are primarily affected. Encephalitis may also occur. The virus replicates in the nervous system, and may cause significant neuronal loss, most notably in the spinal cord. A rare related condition, nonpoliovirus poliomyelitis, may result from infections with nonpoliovirus enteroviruses.
Polycystic ovary syndrome
Clinical symptom complex characterized by oligomenorrhea or amenorrhea, anovulation, and regularly associated with bilateral polycystic ovaries.
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