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 ?
Patients should be advised that temporary blurring of vision, precipitation or worsening of narrow-angle glaucoma, mydriasis, increased intraocular pressure, acute eye pain or discomfort, visual halos or colored images in association with red eyes from conjunctival and corneal congestion may result if ipratropium bromide comes into direct contact with the eyes.
The lecturer from Aston University shared results from a study using atropine 1%, which achieved significant reduction in myopic progression, although conceded that the unwelcome side effects of mydriasis and cycloplegia presented a problem in a clinical setting.
Ophthalmic examination OS revealed raised intraocular pressure (37 mm Hg; reference interval 7-16 mm Hg), mydriasis, conjunctival and episcleral hyperemia, shallow anterior chamber due to anterior displacement of the lens and iris, rubeosis iridis, and engorgement of the pecten.
lips, ears, nose (in severe cases) Myoclonic jerks Snoring when asleep Agitation Confusion Vivid dreams, nightmares or hallucinations In more severe cases Hypotension Coma Convulsions Withdrawal Sweating Mydriasis Pilo-erection Yawning Abdominal cramps/vomiting/ diarrhoea Bone and muscle pain Increase in usual pain Restlessness Anxiety Rhinorrhoea Lacrimation Tremor Table 9.
Anticholinergic effects can include dry skin and mucosa, flushing, mydriasis, hypertension, tachycardia, fever, decreased GI motility, and urinary retention.
Finally, symptoms such as mydriasis (dilation of the pupil), which are not induced by smoking cannabis (Fant et al.
On examination, she displayed mydriasis and slight ptosis, findings that are suggestive of both Horner syndrome and Pourfour du Petit syndrome.
Mydriasert(R) provides a genuine alternative to the mydriatic eye drops that are commonly used for mydriasis.
Other clinical signs that may be seen include mydriasis, air in the retinal arteries and marbling or irregular pallor of the skin or mucous membranes.
In the hippocratic screening test, the administration of vobasine (66) at 300 mg/kg into mice caused lacrimation, mydriasis, respiratory depression and a depression of central nervous system activity (117).
The label says the most commonly reported adverse events in patients who have overdosed on venlafaxine included "tachycardia, changes in level of consciousness ranging from somnolence to coma, mydriasis, seizures, and vomiting.
Approximately 1 hour later, severe anisocoria (10 mm right and 7 mm left) developed, followed by fixed mydriasis.