light reflex


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light reflex

n.
Contraction of the pupil of the eye in response to an increase in light.
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Noun1.light reflex - reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smallerlight reflex - reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller
References in periodicals archive ?
As the pupil pathway is considered to be non-cortical (see Figure 3), post-geniculate damage should not, in theory, affect the pupillary light reflex. However, the pupil response is both slowed and reduced in patients with hemianopia due to optic tract damage, (21) and in those with homonymous hemianopia as a result of stroke affecting the occipital lobe.
Examinations done between 1 and 4 months of age include inspection of the eye and adnexa, red reflex examination, Hirschberg test, and pupillary light reflex test.
The determination of brain death should fulfill the absence of all the above five brainstem reflexes (pupillary light reflex, corneal reflex, oculocephalogyric reflex, oculovestibular reflex, and cough reflex).
The similarity of dorsal light reflex reported in Loliginid squid (Preuss & Budelmann 1995) also worth further investigation.
The study demonstrates a mean reduction in pupillary light reflex in patients with idiopathic intracranial hypertension suggesting that pupillometry reading can be indicative of changes in ICP.
Its eyes can be programmed in a number of ways, including twitching eyeballs, drooping eyelids, idle eye movement, independent pupil light reflex, blown pupil sizes, unequal pupil sizes and a variable blinking rate.
2) with absence of menace reflex and pupillary light reflex. Wet blood film was found to be negative.
The study, published in the journal Nature Communications, saw them investigate the pupillary light reflex - a basic mechanism controlling the amount of light that reaches the retina in which the pupil contracts when the eye is exposed to sudden increases in brightness.
Additionally, the eagle was extremely weak, with neurologic abnormalities including bilateral proprioceptive deficits, nystagmus, and no pupillary light reflex in the left eye.
Previous works suggested that pupillary light reflex (PLR) can reflect photoreceptor function under specific light stimulus [3, 6, 7].
Ears bilaterally symmetrical and equal alignment noted, no ear discharge, tympanic membrane is pink/gray with the light reflex present.
Pupillary light reflex (PLR), the contraction response of the pupil to light stimulation [5], is mainly controlled by the sympathetic and parasympathetic nerves of the autonomic nervous system; hence, pupil changes are not influenced by the external environment or psychological stress [6].