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.
Typical symptoms include dilated pupils and an inability to stand, although it is not normally fatal.
Some reasons include too little tear production, a condition called keratoconus, and very dilated pupils.
Also known as acid, the drug produces physical effects, including tremors, sleeplessness, dry mouth, dilated pupils, loss of appetite, and increased heart rate and blood pressure.
Interactions initially should be very short and stop when there is any sign of aggression - such as tail twitching, ear flattening, stiffening of the shoulders and legs or dilated pupils.
Belladonna is for treating high temperatures when the patients have dilated pupils, a rapid pulse and are constantly thirsty.
Interactions initially should be very short and should stop when there is any sign of aggression - such as tail twitching, ear flattening, stiffening of the shoulders and legs or dilated pupils which all indicate tension.
Looking through Grace's dilated pupils, Wagner saw something unexpected: a white mass at the back of the left eye.
Incredibly, they injected him with the powerful sedative Thorazine even though he was--as they admitted--"flaccid and unresponsive," with fixed and dilated pupils.
Clear indicators of someone on drugs, he said, included erratic behaviour, violence, spots around the mouth, dilated pupils and cravings for sweet drinks.
A long list of potential short-term negative effects includes increased respiration, higher pulse rate, higher blood pressure, increased body temperature, convulsions, irritability, hyperexcitability, grinding of teeth, nervousness, dilated pupils, and death.
Jan Cribbs, an ICU nurse, stated that she found Robin in the ICU hallway with unresponsive, dilated pupils.