mydriasis

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mydriasis

 [mĭ-dri´ah-sis]
great dilatation of the pupil.

my·dri·a·sis

(mi-drī'ă-sis),
Dilation of the pupil.
[G.]

mydriasis

/my·dri·a·sis/ (mĭ-dri´ah-sis) [Gr.] dilatation of the pupil.

mydriasis

(mĭ-drī′ə-sĭs)
n.
Dilation of the pupil of the eye, especially when excessive or prolonged, usually as a result of trauma, a medical disorder, or a drug.

mydriasis

[midrī′əsis]
Etymology: Gk, mydros, hot mass
1 dilation of the pupil of the eye caused by contraction of the dilator muscle of the iris, a muscular sheath that radiates outward like the spokes of a wheel from the center of the iris around the pupil. With a decrease in light or the pharmacological action of certain drugs, the dilator acts to pull the iris outward, enlarging the pupil.
2 an abnormal condition characterized by contraction of the dilator muscle, resulting in widely dilated pupils. See also alternating mydriasis. Compare miosis. mydriatic, adj.

my·dri·a·sis

(mi-drī'ă-sis)
Dilation of the pupil.
[G.]

mydriasis

Widening (dilatation) of the pupil of the eye, usually as a result of instillation of a mydriatic drug, such as ATROPINE or CYCLOPENTOLATE.

mydriasis

1. Dilatation of the pupil. 2. The condition of an eye having an abnormally large pupil diameter (5 mm in daylight). The condition may be due to a paralysis of the sphincter pupillae muscle, to an irritation of the sympathetic pathway, to a drug (e.g. atropine, homatropine), or to adaptation to darkness. See miosis; dilator pupillae muscle; mydriatic; pupil.

my·dri·a·sis

(mi-drī'ă-sis)
Dilation of the pupil.
[G.]

mydriasis

(midrī´əsis),
n an abnormal condition of the eye characterized by contraction of the dilator muscle, resulting in widely dilated pupils.

mydriasis

gross dilatation of the pupil. Common causes in animals are atropine poisoning, hypocalcemia and tiger snake envenomation. Permanent dilatation may be due to damage to the retina, as in toxoplasmosis, or to the optic nerve, as in avitaminosis A.
References in periodicals archive ?
Failure of the dilated pupil to constrict after installation of 1% of pilocarpin hydrochloride confirms the diagnosis.
Otherwise use the slit-lamp biomicroscope and direct illumination through a dilated pupil to view the anterior vitreous and fundus biomicroscopy to view the posterior vitreous.
Typical symptoms include dilated pupils and an inability to stand, although it is not normally fatal.
Some reasons include too little tear production, a condition called keratoconus, and very dilated pupils.
l Sores around the mouth and nose and dilated pupils.
Conversation resumed, though the dilated pupils of my little dear's eyes- suffice to say she was fearful.
It gives a rapid pulse, dilated pupils, sharper reflexes, speeded up reactions and it will dilate airways as it diverts blood away from internal organs and towards the muscles and other physical systems.
This effect was duly noted by the Romans who called the plant 'belladonna,' meaning 'beautiful woman,' in recognition of the fact that women with dilated pupils are generally judged by men to be more attractive.
Heat-related illnesses include dehydration (deficit in body fluids), heat exhaustion (nausea, dizziness, weakness, headache, pale and moist skin, heavy perspiration, normal or low body temperature, weak pulse, dilated pupils, disorientation, fainting spells), and heat stroke (headache, dizziness, confusion, and hot dry skin, possibly leading to vascular collapse, coma, and death).
At one time, dilated pupils were considered attractive, and juice from this belladonna lily (another name for the naked lady), applied directly to the eyes, produced the precise ocular dilation certain Italian noblewomen sought.
The smells of sex, poppers, and sweat from shirts tossed aside compete in air hazy with dry ice as strobes flash everywhere your dilated pupils care to rest.
Explain the need for an eye exam through dilated pupils at least once a year.