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.
Only by regular eye examinations through dilated pupils can glaucoma be detected and treated before loss of vision occurs.
Normally, an ipsilateral fixed and dilated pupil suggests lateral transtentorial herniation, while bilaterally fixed and dilated pupils are consistent with central transtentorial herniation in a fully resuscitated patient.
You can measure the size of your fully dilated pupil by holding a ruler next to your dark-adapted eye and taking a picture of your reflection in a mirror.
The use of a slit-lamp optical section technique is the only accurate way of detecting and assessing nuclear cataract and it is best performed with a dilated pupil, although is still possible undilated.
Operating on one eye at a time, the surgeon cuts into the cornea and works through the dilated pupil to open the capsule containing the opaque lens.
The DigiScope works by capturing digital images of a patient's retina through a dilated pupil and sending the images via the Internet to the Wilmer-EyeTel Reading Center located at The Wilmer Ophthalmological Institute at Johns Hopkins, the number one ophthalmologic hospital in the U.
One of the victims had dilated pupils, he said, quoting one of the rescuers.
However, angle-closure glaucoma does have warning signs, which include sudden redness, eye pain, seeing halos around lights, headaches and dilated pupils.
Currently, police officers in California have to use traditional field sobriety tests and context clues to determine if a driver is high, like the smell of marijuana or dilated pupils.
He had prominent fixed dilated pupils and his left foot was red and slightly swollen (Fig.