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Mydriasis is the dilation of the pupil, usually having a non-physiological cause, [3] or sometimes a physiological pupillary response. [4] Non-physiological causes of mydriasis include disease, trauma, or the use of certain types of drug.
Light entering the eye strikes three different photoreceptors in the retina: the familiar rods and cones used in image forming and the more newly discovered photosensitive ganglion cells. The ganglion cells give information about ambient light levels, and react sluggishly compared to the rods and cones.
Terminal lucidity is a narrower term than the phenomenon paradoxical lucidity where return of mental clarity can occur anytime (not just before death). [ 4 ] [ 5 ] However, as of 2024 [update] , terminal lucidity is not considered a medical term and there is no official consensus on the identifying characteristics.
of or pertaining to the eye's pupil: Greek κόρη (kórē), girl, doll; pupil of the eye corectomy: cord(i)-of or pertaining to the heart (uncommon as a prefix) Latin cor, heart commotio cordis, cornu-applied to describing processes and parts of the body as likened or similar to horns Latin cornū, horn greater cornu: coron-pertaining to the ...
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
The Hippocratic facies (Latin: facies Hippocratica) [1] is the change produced in the face recognisable as a medical sign known as facies and prognostic of death. It may also be seen as due to long illness , excessive defecation , or excessive hunger , when it can be differentiated from the sign of impending death.
Normal eye with two pupils equal in size and reactive to light. This means that the patient is probably not in a coma and is probably lethargic, under influence of a drug, or sleeping. "Pinpoint" pupils indicate heroin or opiate overdose, which can be responsible for a patient's coma.
Anisocoria is a condition characterized by an unequal size of the eyes' pupils. Affecting up to 20% of the population, anisocoria is often entirely harmless, but can be a sign of more serious medical problems.