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A human adult exhibiting voluntary control over his iris muscles, where he can cause his pupil to dilate and constrict on command. A dilation response , is the widening of the pupil and may be caused by adrenaline; anticholinergic agents; stimulant drugs such as MDMA, cocaine, and amphetamines; and some hallucinogenics (e.g. LSD). [3]
Droopy eyelids can give the face a false appearance of being fatigued, uninterested or even sinister. The eyelid may not protect the eye as effectively, allowing it to dry. Sagging upper eyelids can partially block the field of view. Obstructed vision may necessitate tilting the head backward to speak.
In an eye without polycoria, the sphincter muscle is a part of the iris that functions to constrict and dilate the pupil. [ 7 ] [ better source needed ] A patient with true polycoria experiences handicapped vision as well as stimulation of the retina in response to bright lights.
Both pupils are dilated (mydriasis) because of hyper-activation of the sympathetic system caused by the psychedelic drug LSD Mydriasis with the pupil dilated to 9mm in diameter as a result of dim lighting. Most individuals are not able to achieve pupillary dilation to this extent without mydriatic agents
oculus dexter (right eye) OH Ocular history OMB Oculo motor balance ONH Optic nerve head Oph Ophthalmoscopy OS oculus sinister (left eye) OU oculus uterque (both eyes) PD Pupillary distance PERRLA Pupils equal, round, reactive to light and accommodation PH Pinhole see Pinhole occluder and Visual_acuity#Legal_definitions: PHNI Pinhole No Improvement
Miosis, or myosis (from Ancient Greek μύειν (múein) 'to close the eyes'), ... Anisocoria is the condition of one pupil being more dilated than the other. Causes
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Pupils of both sexes dilated after seeing pictures of people of the opposite sex. In females, the difference in pupil size occurred also after seeing pictures of babies and mothers with babies. This examination showed that pupils react not only to the changes of intensity of light (pupillary light reflex) but also reflect arousal or emotions.