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 ?
The Provider will be expected to undertake a full cataract assessment including: pupil dilation and examination by indirect ophthalmoscopy in order to establish whether there are any co-existing ocular disorders as well as cataract, discussion of the health questionnaire and any outstanding issues dealt with, communicating the potential advantages and disadvantages of cataract extraction, ascertaining the patient's willingness for surgery, ensuring the patient meets the Procedures of Limited Clinical Policy Criteria, offer choice and refer on to secondary care where required.
For example, during his time at MTV, he developed the first biometrics lab to track how people responded to ads by measuring their heart rate, pupil dilation and facial expressions.
The Phase II, masked, non-randomized, cross-over study evaluated 12 subjects who underwent pupil dilation with topical phenylephrine administered by a 32-[micro sign]L eye dropper (at one of two concentrations: 2.
Researchers then measured their pupil dilation and how long an infant's or an adult's eyes remained fixed to a photograph after hearing a sentence using eye-tracking.
The researchers then used eye-tracking measures, such as how long an infant's or an adult's eyes remained fixed to a photograph after hearing a sentence, and pupil dilation.
Although pupil dilation improves and iris billowing decreases when tamsulosin is discontinued 1-2 weeks before cataract surgery, the risk of IFIS persists up to a year after discontinuation.
To detect the stress identification levels based upon various parameters such as galvanic skin response, facial expressions, speech waves and pupil dilation
To perform a complete ophthalmic examination of the avian eye, the fundus must be examined; however, the unique anatomy of the avian iris makes pupil dilation challenging.
Harman International Industries hopes to reduce the number of vehicle accidents caused by driver tiredness and distraction with a camera system that monitors changes in the driver's pupil dilation and automatically operates mobile phones and driver-assistance systems.
Volunteers were tested for their levels of attraction towards the motorist using telltale signs like their pulse rate, pupil dilation, blink rate and body language.
During the study, the children of 47 mothers with a history of major depressive disorder were shown happy, angry and sad images while researchers tracked their pupil dilation.
Increased pupil dilation is a defense strategy, to enable one to see farther, and a faster response to stimuli.