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 ?
Again, I sensed a note of sarcasm, but only because of the twinkle in one of her dilated pupils.
His CNS examination showed signs of meningeal irritation with fixed and dilated pupils.
The panel previously heard that Whittle - who denied having a drink problem - often stank of alcohol, was seen swaying on her feet with dilated pupils and was "drunk every time she was on duty".
Maria alleged that prior to both surgeries her physicians failed to discover that she had abnormally large night-adjusted pupils and as a consequence, failed to inform her that her large dilated pupils increased the risk that she would develop postsurgical nighttime vision problems.
Police suspected Michael had taken drugs as he appeared "spaced out", was sweating profusely and had dilated pupils.
The more or less dilated pupils are dark black, with violet tones.
The trauma patients with a Glasgow Coma Scale store of 3 and bilateral fixed and dilated pupils have any chance of survival?
Glaucoma can be detected during an eye exam, when an eye care professional such as an ophthalmologist looks at the inside of your eyes through dilated pupils.
Doctors had revived him for 45 minutes before he was declared dead, said Dr Chua, adding that Delano had a zero pulse rate and dilated pupils when bystanders brought him to the emergency section of the hospital in the morning.
You can protect yourself by having regular eye exams through dilated pupils.
This type of headache presents with sudden onset, paresthesia, dilated pupils, visual disturbances, neurological deficits and cardiovascular instability (5).