mydriasis


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my·dri·a·sis

 (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.

[Latin mydriāsis, from Greek mudriāsis, perhaps from mudros, red-hot mass of metal in a forge (in reference to the more brilliant appearance of the dilated pupil to ancient physicians, as a result of light reflected off the fundus of the eye ); possibly akin to mudān, to be damp, dripping ( mudros perhaps originally referring to molten iron).]

mydriasis

(mɪˈdraɪəsɪs; maɪ-)
n
(Pathology) abnormal dilation of the pupil of the eye, produced by drugs, coma, etc
[C17: via Late Latin from Greek; origin obscure]

my•dri•a•sis

(mɪˈdraɪ ə sɪs, maɪ-)

n.
excessive dilatation of the pupil of the eye, as the result of disease, drugs, or the like. Compare miosis.
[1650–60; < Latin mydriāsis < Greek mydríāsis, appar. derivative of mýdros hot mass of iron, though sense connection unclear]

mydriasis

abnormal dilatation of the pupil, the result of disease or the use of certain drugs. Cf. miosis. — mydriatic, adj.
See also: Eyes
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.mydriasis - reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs
dilatation, dilation - the act of expanding an aperture; "the dilation of the pupil of the eye"
Translations

my·dri·a·sis

n. midriasis, dilatación prolongada de la pupila.
References in periodicals archive ?
Results of the present study show that topically applied rocuronium bromide induced a consistent mydriasis in all of the treated eyes of the birds in this study.
OMS302, added to standard irrigation solution used during ophthalmological procedures, is Omeros' proprietary PharmacoSurgery product in development to maintain intra-operative mydriasis (pupil dilation) and reduce postoperative pain and irritation resulting from cataract and other lens replacement surgery.
Cocaine is a noradrenaline re-uptake inhibitor that results in increased noradrenaline levels at the neuromuscular junction of the normal pupil; hence mydriasis occurs in the normal pupil but not in the noradrenaline-deficient Horner's pupil.
It may be preferable to give topical mydriatic drugs 30 to 60 minutes prior to induction of general anesthesia to assess adequacy of mydriasis before induction (5).
They result in conditions such as papillary mydriasis, miosis, and iridocycitis (an inflammatory reaction associated with aching and photosensitivity).
Manifestations included visual hallucinations (12 persons), mydriasis (10), tachycardia (six), dry mouth (five), agitation (four), nausea and vomiting (four), incoherence (three), disorientation (three), auditory hallucinations (two), combativeness (two), decreased bowel sounds (two), slurred speech (two), urinary retention (one), and hypertension (one).
Different postoperative complications, such as silicone oil under conjunctiva, posterior capsule opacity, temporary ocular hypertension, iris and corneal neovascularisation, band keratopathy, postoperative mydriasis, and retinal redetachment, were observed in 5 patients (36%).
Antipsychotics which have strong anticholinergic and/or antiadrenergic effects (such as chlorpromazine and fluphenazine) cause mydriasis and cycloplegia.
In one report patient did not have a documented blood methanol level but did have necrotic changes in the putamen bilaterally.10 Another case of acute methanol intoxication presented with weakness, blurred vision, mildly reactive bilateral mydriasis and progressive decrease in the level of consciousness.
(17) Several studies have reported both ocular and systemic side effects (especially using atropine) in those children who have had a cycloplegic refraction, in addition to expected mydriasis and cycloplegia, as detailed later.
Nicotinic receptor stimulation leads to tachycardia, hypertension, mydriasis, fasciculations and muscle weakness, as well as respiratory failure.