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What are pontine pupils?

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To answer in a consise way ,pontine pupils are pupils of small size,pupillary aperture less than 2mm in diameter,reacting poorly to light. Normally in ambient conditions ,pupillary aperture will be of 4mm in size and will be reacting to light,that... read more

Pinpoint pupils, or abnormal miosis, occur as the result of stimulation to the parasympathetic side of the autonomous nervous system. According to WebMD, drug use, exposure to organophosphates and intracranial hemorrhaging all cause both pupils to shrink. Inflammation and Horner's syndrome usually cause only one pupil to shrink, but not both. read more

These pupils do not react to light. Damage to more caudal levels of the midbrain will damage the sympathetics as well, resulting in a pupil that is midposition in size (4-7 mm, varying from individual to individual) and unreactive to light. If the brain stem down through the pons-medulla is involved, the pupils continue to be midposition and fixed. read more

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