Constrict constriction different pupil. Medical search. Frequent questions

The nerve also contains fibers that innervate the intrinsic eye muscles that enable pupillary constriction and accommodation (ability to focus on near objects as in reading). (wikipedia.org)
Adie's pupil is caused by damage to peripheral pathways to the pupil (parasympathetic neurons in the ciliary ganglion that cause pupillary constriction to bright light and with near vision). (wikidoc.org)
The AR pupil is thought to be caused by damage to central pathways for pupillary constriction. (wikidoc.org)
The older literature on AR pupils did not report the details of pupillary constriction (brisk vs. tonic) that are necessary to distinguish AR pupils from tonic pupils. (wikidoc.org)
Normally, the degree of pupillary constriction does not change as the flashlight is swung from eye to eye. (msdmanuals.com)
As for the appearance of heroin and the look of pinpoint pupils, a study on the effect of heroin has found that pupillary constriction starts in 15 min and persists for at least two hours depending on the individual and certain circumstances. (clearbrookinc.com)
Unexpected pupillary constriction during surgery increases the risk of complication. (bvsalud.org)
The pathway of pupillary constriction begins at the Edinger-Westphal nucleus near the occulomotor nerve nucleus. (papasindiagrill.com)

Yes, a cat's pupils can dilate or constrict depending on their emotional state. (lcworks.org)
Older cats tend to have less flexible pupils, which may not dilate or constrict as much as younger cats. (lcworks.org)
No, the speed at which a cat's pupils dilate or constrict can vary depending on the individual cat. (lcworks.org)
Usually, the pupils in each eye dilate or constrict at the same time. (idairco.com)

No, the dilation and constriction of their pupils are involuntary responses. (lcworks.org)
Octopuses are expertly adapted to their environment on so many levels with pupil dilation and constriction being just another incredible trick up their sleeve (or should I say arm? (octonation.com)

The Edinger-Westphal nucleus supplies parasympathetic fibers to the eye via the ciliary ganglion, and thus controls the sphincter pupillae muscle (affecting pupil constriction) and the ciliary muscle (affecting accommodation). (wikipedia.org)
Their findings prove that mouse eyes have a photosensitive function built directly into the ring of sphincter muscle surrounding the pupil. (jhu.edu)
The traditional view of this reflex is that light triggers nerve signals traveling from the eye's retina to the brain, thereby activating returning nerve signals, relayed by the neurotransmitter acetylcholine, that make the sphincter muscle contract and constrict the pupil," says King-Wai Yau, Ph.D. , a neuroscientist at the Johns Hopkins University School of Medicine and an author of the report. (jhu.edu)
Pupil size is governed by the tone of the pupillary sphincter (parasympathetic) and the pupillary dilator muscles (sympathetic) in response to ambient light, adrenergic tone, and local pharmacologic or pathophysiologic conditions. (allnurses.com)
Prostaglandins also appear to play a role in the miotic response produced during ocular surgery by constricting the iris sphincter independently of cholinergic mechanisms. (nih.gov)
It causes constriction of the internal bladder sphincter which leads to urine retention. (biologyease.com)

The opposite of constriction, miosis is a reflexive response that makes the pupils dilate (open) when exposed to light or other stimulation. (articlesall.com)
Morphine constricts the pupil (miosis) by its central action rather than a peripheral action. (biologyease.com)
When your pupil shrinks (constricts), it's called miosis. (idairco.com)

This reflex is elicited through the contraction of the iris' muscles- the spincter muscles for pupil constriction and the dilator muscle for pupil dilation. (explorable.com)

Returning the light to the (relatively) normal right eye results in constriction of both pupils again. (cehjournal.org)

Thus, there is constriction of bronchial and bladder muscles. (biologyease.com)
The muscles, nerves and brain regions that control the pupils must all function well to get normal PERRLA test results. (nccmed.com)
A scratch or other eye injury can damage the muscles in the iris, causing irregularly shaped pupils. (nccmed.com)
With octopuses, each pupil is controlled by 7 extraocular muscles, each controlled by its own nerve. (octonation.com)

There has been a resurgence in research examining pupil dilation as a potential index of sexual orientation. (springer.com)

When you go to see an eye doctor, they will use a pupilometer to measure pupil dilation. (articlesall.com)
If you've ever tried to measure pupil dilation, you know it can be a complex task . (top5reviewed.com)
Various techniques can be used to accurately measure pupil dilation, including the use of a topographer, ruler or pupil gauge , Volk Eye Check , infrared pupillometer , and binocular pupillometry system . (top5reviewed.com)
Volk Eye Check is one of the methods used to accurately measure pupil dilation . (top5reviewed.com)
An infrared pupillometer is a device used to accurately measure pupil dilation. (top5reviewed.com)

Hey I Know This Probably Sounds Like A Stupid Question We Are Learning About Pupillary Reactions Perla How Will The Pupils React To Light If Someone Is Blind In One Eye? (allnurses.com)
My second pt was legally blind and the RN going off said "I didn't do pupil checks, he's legally blind,they don't react. (allnurses.com)
To understand how the pupils react to light, it is important to understand the light reflex pathway (Figure 1). (cehjournal.org)
Your pupils react to changes in light by constricting or dilating in response to how bright or dark it is around them. (articlesall.com)
Argyll Robertson pupils ("AR pupils") are bilateral small pupils that constrict when the patient focuses on a near object (they " accommodate " with near vision), but do not constrict when exposed to bright light (they do not "react" to light). (wikidoc.org)
They were formerly known as "prostitute's pupils" because of their association with syphilis and because, like a prostitute, they "accommodate but do not react. (wikidoc.org)
Pupils that "accommodate but do not react" are said to show light-near dissociation . (wikidoc.org)
In the early 20th century, Adie described a second type of pupil that could "accommodate but not react. (wikidoc.org)
A patient whose pupil "accommodates but does not react" almost always has a tonic pupil, not an AR pupil. (wikidoc.org)
The evidence supports a midbrain cause of the AR pupil, provided one follows Loewenfeld's definition of the AR pupil as small pupils that react very poorly to light and yet seem to retain a normal pupillary near response that is definitely not tonic. (wikidoc.org)
This uncommon syndrome involves vertical gaze palsy associated with pupils that "accommodate but do not react. (wikidoc.org)

Adie's tonic pupil is usually associated with a benign peripheral neuropathy ( Adie syndrome ), not with syphilis. (wikidoc.org)
Adie syndrome, or Adie tonic pupil, is one of the most common causes of an excessive PERRLA test results. (nccmed.com)
Tonic pupil or Adie syndrome Tonic pupil is where one pupil will appear abnormally large in light, taking a long time to constrict. (idairco.com)
Although usually not harmful, having a tonic pupil may lead to someone becoming miotic, or chronically having a small pupil. (idairco.com)

Normally, the pupils constrict promptly (within 1 sec) and equally during accommodation and during exposure to direct light and to light directed at the other pupil (consensual light reflex). (msdmanuals.com)

The efferent part of the pathway (blue) is the impulse/message that is sent from the mid-brain back to both pupils via the ciliary ganglion and the third cranial nerve (the oculomotor nerve), causing both pupils to constrict, even even though only one eye is being stimulated by the light. (cehjournal.org)

The effect of morphine was assessed by measuring pupil diameter and ventilatory response to a hypercapnic challenge. (silverchair.com)

Special drops are used to prevent pupil constriction and allow the pupil to stay wide open in order to allow the doctor to view the entire retina, optic nerve, blood vessels and macula. (solinskyeyecare.com)
The drops generally take about 15 to 30 minutes in order to allow the pupil to completely open. (solinskyeyecare.com)
These light-sensitive pathways allow the pupil to constrict to bright light. (wikidoc.org)

The 'swinging light test' is used to detect a relative afferent pupil defect (RAPD): a means of detecting differences between the two eyes in how they respond to a light shone in one eye at a time. (cehjournal.org)
If a relative afferent defect (deafferented pupil, afferent pupillary defect, or Marcus Gunn pupil) is present, the pupil paradoxically dilates when the flashlight swings to the side of the defect. (msdmanuals.com)

The afferent part of the pathway (red) refers to the nerve impulse/message sent from the pupil to the brain along the optic nerve when a light is shone in that eye. (cehjournal.org)
This is called an afferent response because it occurs when the pupil is stimulated. (articlesall.com)

Anisocoria (both pupils are different sizes). (papasindiagrill.com)
The term anisocoria refers to pupils that are different sizes at the same time. (idairco.com)

Opioid use affects the sympathetic and parasympathetic nervous systems, controlling the pupils. (clearbrookinc.com)
In order to understand how the pupil size will change, it is most important to understand the sympathetic and parasympathetic nervous system. (studentrdh.com)
To simplify, if the drug is "stimulating" the sympathetic system, the pupil will grow larger. (studentrdh.com)

They found that pupil size fluctuated wildly, but predictably, during sleep. (discovermagazine.com)
Pupil size variation was due to active constriction by the parasympathetic pathway of the nervous system, which regulates homeostasis and the body at rest. (discovermagazine.com)
From this experiment, the researchers also found that other bodily rhythms, such as the heartbeat, can be predicted from pupil size in sleep. (discovermagazine.com)
One such characteristic that often catches our attention is their ability to change the size of their pupils. (lcworks.org)
Additionally, cats' pupils also change size in response to emotional states. (lcworks.org)
3. Should I be concerned if my cat's pupils don't change size? (lcworks.org)
4. Can cats control the size of their pupils voluntarily? (lcworks.org)
5. Can a cat's emotions affect the size of their pupils? (lcworks.org)
6. Can a cat's age affect their pupils' size? (lcworks.org)
7. Do all cats' pupils change size at the same rate? (lcworks.org)
8. Are there any other animals that can control their pupils' size like cats? (lcworks.org)
Yes, many nocturnal animals, such as owls and some reptiles, have similar abilities to control their pupils' size for improved night vision. (lcworks.org)
This is to prevent the near-pupil response (a constriction in pupil size when moving focus from a distant to a near object). (cehjournal.org)
Most patients return back to normal vision and pupil size within 4 to 6 hours. (solinskyeyecare.com)
This is termed "the pupillary light reflex" and is responsible for an increase in pupil size (dilation) when the visual environment is darker and a decrease in pupil size (constriction) in brighter settings (Ellis, 1981 ). (springer.com)
For example, one may not immediately notice that the size and shape of their pupil have changed after experiencing a TBI. (articlesall.com)
Pupilometry is a medical test that measures the size and reaction of your pupils. (articlesall.com)
These projects toward the hypothalamus and brain stem centers, controlling pupil size via the parasympathetic system. (articlesall.com)
Pupils are inspected for size, equality, and regularity. (msdmanuals.com)
Slit pupils allow the iris to contract or expand more dramatically- a human's round pupil can expand to allow light to be 10-fold more intense compared to its smallest size, while a cat's pupil expands to 135-fold intensity. (koryoswrites.com)
As cataract surgical techniques continue to improvise and get faster, an adequate pupil size is of paramount importance. (bvsalud.org)
For example, if the pupil size decreases from 7 mm to 6 mm, this 1 mm change in pupil diameter will lead to a decrease of 10.2 mm2 in the area of surgical field. (bvsalud.org)
The pupils should be equal in shape and size. (nccmed.com)
Pupils change in size to control how much light enters your eye. (papasindiagrill.com)
If the pupil doesn't vary in size in response to changes in lighting and gaze, there might be something wrong. (papasindiagrill.com)
Pupil size can reflect cognitive influences such as attention and mental effort . (top5reviewed.com)
There are various techniques available for accurately measuring pupil size, including the use of a topographer, ruler or pupil gauge, Volk Eye Check , infrared pupillometer , and binocular pupillometry system . (top5reviewed.com)
This tool shows us the size of the pupil and its shape. (top5reviewed.com)
This method involves visually observing the size of the pupil and comparing it to a scale or gauge. (top5reviewed.com)
It is a simple and straightforward technique that can provide an estimate of pupil size. (top5reviewed.com)
It is a portable handheld device that can quickly and easily assess the size of the pupils. (top5reviewed.com)
This method is particularly useful for monitoring changes in pupil size during neurological assessments or critical care situations. (top5reviewed.com)
It works by using infrared light to analyze the size of the pupils. (top5reviewed.com)
The use of an infrared pupillometer has proven beneficial in providing precise and objective measurements for different applications related to pupil size measurement techniques. (top5reviewed.com)
It can record the size of the pupils during different types of responses, like when light is shone directly or indirectly into the eyes. (top5reviewed.com)
This system offers a more accurate and precise way to measure pupil size compared to other methods. (top5reviewed.com)
Its ability to provide detailed information about pupil size makes it a valuable tool in research and clinical practice. (top5reviewed.com)
What causes temporary unequal pupil size? (idairco.com)
In addition, emotions can change the size of your pupils. (idairco.com)
Is it dangerous to have different size pupils? (idairco.com)
Many people have very slight differences in the size of their pupils, which is usually not harmful. (idairco.com)
Pupils, or the black parts at the center of the eyes, change size to regulate the amount of light entering the eye. (idairco.com)
Another example is Japetella diaphana , a deep-sea octopus species that takes 6 seconds to change its pupil size. (octonation.com)

Constriction of the blood vessels around the mouth mean that the salivary glands temporarily stop producing saliva, causing a dry mouth . (medicalnewstoday.com)
When this happens, adrenaline is released, blood pressure rises, muscle tense and blood vessels constrict. (permacastwalls.com)

If your cat's pupils remain dilated or constricted in all light conditions, it may indicate an underlying health issue, and a veterinarian should be consulted. (lcworks.org)

When a person's pupils are dilate, it means that they have been expose to light. (articlesall.com)
Muscle tension can also create a constricted feeling in the throat, and result in a person's voice becoming higher pitched . (medicalnewstoday.com)
This constriction acts like a pinhole, increasing a person's ability to focus at different distances. (easydrugcard.com)

Swinging-light test - normal (no RAPD) Illumination of either eye induces normal and equal pupil responses in both eyes (consensual responses). (cehjournal.org)
If the room is too dark it will be difficult to observe the pupil responses, particularly in heavily pigmented eyes. (cehjournal.org)
We carried out a meta-analytic review of studies published between 1965 and 2020 ( Mdn year = 2016) measuring pupil responses to visual stimuli of adult men and women to assess sexual interest. (springer.com)
Only heterosexual and gay men demonstrated discrimination in pupillary responses that was clearly in line with their sexual orientation, with greater pupil dilation to female and male stimuli, respectively. (springer.com)
Through applying continuous theta-burst transcranial magnetic stimulation over the right FEF (and vertex) to inhibit its activity, we investigated the role of the FEF in human pupil local-luminance responses. (tmu.edu.tw)
Pupil light reflex responses were transiently evoked by a bright patch stimulus presented during the delay period in the visual- and memory-delay tasks. (tmu.edu.tw)
Linear mixed model results further found that stimulation condition, patch location consistency, and visual field significantly modulated observed pupil constriction responses. (tmu.edu.tw)
Together, our results constitute the first evidence of FEF modulation in human pupil local-luminance responses. (tmu.edu.tw)
One exciting advancement in pupil dilation measurement methods is the use of Convolution Neural Networks , which have shown promising results in accurately analyzing pupillary responses. (top5reviewed.com)

The pupil constricts in response to an increase in global luminance level, commonly referred to as the pupil light reflex. (tmu.edu.tw)

Experimenting with mice, neuroscientists at Johns Hopkins Medicine report new evidence that the eye's iris in many lower mammals directly senses light and causes the pupil to constrict without involving the brain. (jhu.edu)
Constriction of the Pupils: Constricted or narrowed pupils (from emotions like disgust or concentration) make the colored part of the iris more visible, enhancing the pale greys and blues of grey eyes. (colorwithleo.com)
To settle the question of whether the AR pupil is of central or peripheral origin, it will be necessary to perform iris transillumination (or a magnified slit-lamp examination) in a substantial number of patients who have a pupillary light-near dissociation (with and without tonicity of the near reaction), perhaps in many parts of the world. (wikidoc.org)
But the focus (ha ha) today is on the pupil, the transparent bit inside the iris that allows light to enter the eye. (koryoswrites.com)
Doctors think that a spasm in a muscle in the iris causes tadpole pupil. (nccmed.com)
The pupil is constricted or dilated by the contraction of smooth muscle in the iris. (studentrdh.com)

Heroin eyes refer to the appearance of the eyes of someone who is taking the drug, as they have eyes that appear to be sinking or droopy and have pinpoint pupils. (clearbrookinc.com)
What Causes Pinpoint Pupils? (clearbrookinc.com)
Pinpoint pupils are a warning as signals in the brain demand the body to slow down. (clearbrookinc.com)
Enlarged pupils will be the result of dilation, while pinpoint pupils are the result of constriction. (idairco.com)

Swinging-light test - left RAPD Illumination of the (more) normal right eye causes both pupils to constrict. (cehjournal.org)
Swinging-light test: left RAPD + non-reactive left pupil Illumination of the relatively normal right eye causes only right pupil constriction. (cehjournal.org)
In this situation it is only necessary to observe the eye with the reactive pupil in order to identify an RAPD. (cehjournal.org)
The physiological basis of the RAPD test is that, in healthy eyes, the reaction of the pupils in the right and left eyes are linked. (cehjournal.org)
In a normal swinging light test (i.e. there is no RAPD) the pupils of both eyes constrict equally regardless of which eye is stimulated by the light (Figure 2). (cehjournal.org)
In an abnormal swinging-light test (i.e. there is a RAPD) there is less pupil constriction in the eye with the retinal or optic nerve disease (Figure 3). (cehjournal.org)

When the light is moved to the abnormal left eye (e.g. fixed pupil and optic neuropathy), the right pupil dilates (constricts less). (cehjournal.org)

Experts also refer to this as "dilatation of the pupil," and it happens when you have an injury or head trauma, such as a concussion or brain injury. (articlesall.com)

A brighter light will cause more constriction. (allnurses.com)

On the contrary if the parasympathetic system is "stimulated", the pupil will become smaller. (studentrdh.com)

Shining a light in one eye of a normal subject causes both pupils to constrict equally. (allnurses.com)
When the light source is taken away, the pupils of both eyes enlarge equally. (cehjournal.org)

If, after shining a light in one eye, the light is quickly switched to the other eye, the response will be an initial constriction of both pupils followed by an equivalent re-dilation. (allnurses.com)
When light is shined into the eye, the normal pupillary response is to constrict to limit the amount of light that enters. (solinskyeyecare.com)
Pupil dilation can be evoked as a response to affective arousal, for example, during the viewing of highly pleasant (including sexually suggestive stimuli) and unpleasant stimuli (Bradley et al. (springer.com)
The pupil that is being illuminated should contract in response to the light source. (articlesall.com)
Pupil reaction time is the time it takes for the pupil to constrict in response to light. (articlesall.com)
The near response in AR pupils is brisk and immediate. (wikidoc.org)
The near response in tonic pupils is slow and prolonged. (wikidoc.org)
A deafferented pupil constricts in response to consensual but not to direct light. (msdmanuals.com)
Stimulation of thesympathetic nervous system, which is known for triggering a fight-or-flight response when the body is under stress, can also cause the pupil to dilate. (papasindiagrill.com)
Octopuses possess an autonomic (unconscious) response that maintains the orientation of their pupils such that they are always horizontal- no matter what. (octonation.com)

If tracked during the day, the pupil will not only respond to changes in external stimuli such as light, but also to internal conditions such as attention and emotional states. (discovermagazine.com)
Bisexual men showed greater pupil dilation to male stimuli. (springer.com)
Although heterosexual women exhibited larger pupils to male stimuli compared to female stimuli, the magnitude of the effect was small and non-significant. (springer.com)
Finally, lesbian women displayed greater pupil dilation to male stimuli. (springer.com)
With this technology, researchers can study how the pupils respond to stimuli and better understand cognitive processes such as attention and mental effort. (top5reviewed.com)

This enlarges and darkens the pupil, making grey eyes appear darker overall. (colorwithleo.com)

It causes constriction of sphincters. (biologyease.com)

Accurate measurement of pupil dilation techniques has numerous applications in various fields including medical research, refractive surgery planning, neurological assessment in critical care settings, and understanding visual function. (top5reviewed.com)

Understand the basics of pupil reactivity after head injury. (articlesall.com)

If an efferent defect is present, the pupil responds sluggishly or does not respond to both direct and consensual light. (msdmanuals.com)

Conversely, when exposed to bright light, their pupils constrict, reducing the amount of light entering the eyes and preventing overexposure. (lcworks.org)
1. Do all cats' pupils get thin in bright light? (lcworks.org)
No, their pupils will constrict when exposed to bright light. (lcworks.org)
In other words, a bright light shone into one eye leads to an equal constriction of both pupils. (cehjournal.org)
The pupil is able to dilate (open wide) in a dim light environment or constrict (narrow) in bright light due to its Whytt's reflex. (explorable.com)
In bright lights, the eyes tend to constrict to limit the amount of light entered. (clearbrookinc.com)
In very bright conditions, the pupil which controls the amount of light reaching the light sensitive retina, cannot constrict small enough to reduce light to a comfortable level. (milaneyecenter.com)
Healthy pupils get smaller in bright or direct light, as well as when a person focuses on something very close to their eyes. (nccmed.com)
There is larger pupil constriction evoked by a bright stimulus when the stimulus location spatially overlaps with the locus of attention, and these effects have been extended to saccade planning and working memory (here referred to as pupil local-luminance modulation). (tmu.edu.tw)
Normal pupils are 2 to 4 millimeters in bright light and 4 to 8 millimeters in the dark. (papasindiagrill.com)
Pupils are large in the dark to let more light in and small in bright light. (idairco.com)
Since they like spending time in their dark dens but also need to come out into bright shallow waters, their pupils are ready for this drastic change of light. (octonation.com)
Such cataracts reduce visual acuity more when the pupil constricts (eg, in bright light, during reading). (msdmanuals.com)

In a report in the June 19 issue of the journal Current Biology , Neuroscience Professor King-Wai Yau and colleagues detail how the pupils in a mouse's eyes get smaller when the animal is moved from a dark to a lit room even when the nerve connections between the animal's brain and eyes are severed. (jhu.edu)
The primary reason for cats' pupils getting thin is their ability to control the amount of light entering their eyes. (lcworks.org)
When their surroundings are dark, cats' pupils dilate, allowing more light to enter their eyes, thus enhancing their ability to see in low-light conditions. (lcworks.org)
Pupils are the black circles inside your eyes that allow light into them so they can see. (articlesall.com)
The pupils dilate to allow more light into the eyes, which allows someone to see better and observe their surroundings. (medicalnewstoday.com)
Slit pupils are found most often in animals with eyes that are exposed to highly variable light conditions- i.e., nocturnal or crepuscular animals. (koryoswrites.com)
In fish eyes, this detriment can be corrected by having a pupil with different focal lengths- i.e., different sharpness in the way light is angled towards the fovea. (koryoswrites.com)
Sunglasses reduce the amount of light reaching the eyes to a more comfortable level, eliminating the need for squinting and severe pupil constriction. (milaneyecenter.com)
The device uses infrared light to capture images of the eyes and calculate the diameter of the pupils. (top5reviewed.com)
Primarily, the pupils dilate (get bigger) or constrict (get smaller) to control the amount of light that enters the eyes. (idairco.com)
Dilating their pupils can aid their deimatic (threat or startle) displays by making predators think twice about attacking because those massive eyes could be attached to a big body! (octonation.com)

In the visual-delay task, larger pupil constriction was observed when the patch location was spatially aligned with the target location in both stimulation conditions. (tmu.edu.tw)
More interestingly, after FEF stimulation, larger pupil constriction was obtained when the patch was presented in the contralateral, compared to the ipsilateral visual field of the stimulation. (tmu.edu.tw)

Muscle fatigue associated with squinting and constant constriction of the pupil can lead to headache and eyestrain. (milaneyecenter.com)

The effect of noise increases heartbeat, dilation of pupils and constriction of blood which explains why we have trouble sleeping in loud places. (permacastwalls.com)

The normal pupil reaction time is 1-2 seconds. (articlesall.com)
Age, drugs and head injury affect pupil reaction times-but there's no need for alarm if the patient falls outside of those ranges! (articlesall.com)

A mydriatic is an agent that induces dilation of the pupil. (papasindiagrill.com)

In Horner's syndrome, the pupil in the involved eye is smaller and does not get bigger (dilate) as well as the other eye. (papasindiagrill.com)
People with Horner's syndrome have one abnormally large pupil. (idairco.com)

Anxiety and dilated pupils. (papasindiagrill.com)

In the twentieth century, a number of incidental observations of pupils responding to factors other than light, including interest and arousal, led to the pivotal research of Löwenstein and Loewenfeld. (springer.com)
A state of arousal leads to activation of the autonomic nervous system that is characterized by changes in skin conductance rate, blood pressure, breathing rate, and pupil dilation (Zuckerman, 1971 ). (springer.com)
Dilation of the Pupils: When we experience emotions like arousal, interest, or fear, our pupils dilate to let in more light. (colorwithleo.com)

Pupils on heroin are unnaturally small under room lighting conditions, and the pupil is the part of the eye that controls how much light is allowed to pass through. (clearbrookinc.com)
Usually, the pupils will become small and appear as if someone dotted their eye with a ballpoint pen. (clearbrookinc.com)
Many nocturnal species have round pupils which are actually quite good at contracting to very small sizes. (koryoswrites.com)
Making a good capsulorhexis with a small pupil can be a challenge, even for an experienced surgeon. (bvsalud.org)
When dealing with challenging cases like lens subluxation, pseudo-exfoliation, and zonular dehiscence, a small pupil further increases the risk and adversely affects the surgical outcome. (bvsalud.org)
This review highlights the risk factors for small pupils during surgery and current management strategies. (bvsalud.org)
Constricted, or small pupils, can occur for a variety of reasons including eye injuries, brain trauma, medication side effects and stroke. (papasindiagrill.com)
If your pupils stay small even in dim light, it can be a sign that things in your eye aren't working the way they should. (idairco.com)
When to see a doctor about small pupils? (idairco.com)

conversely, in dim light the pupil expands to increase the amount of light coming in. (koryoswrites.com)

His pupils started out equal but became unequal. (allnurses.com)

In the 1950s, Loewenfeld [4] distinguished between the two types of pupils by carefully observing the exact way in which the pupils constrict with near vision. (wikidoc.org)

Much like the pupil of the eye, which expands and constricts, in order to focus, this OLA16 enables you to make use of the patterns of opening and closure of opportunity so that you can confidently anticipate the immediate future. (obafemio.com)

The opening at the front of the eye, called the pupil, controls the amount of light that enters your eye. (trailvisioncare.ca)

The fact that the pupil of the human eye responds to changes in brightness levels within our visual environment is well known to most people. (springer.com)

Sudden pupil dilation that isnt caused by light change. (papasindiagrill.com)

If the pupils are oval or another odd shape, this may be due to damage to the pupil fibers that attach in the midbrain. (nccmed.com)

Anatomy11

Organisms2

Diseases17

Chemicals and Drugs9

Analytical, Diagnostic and Therapeutic Techniques and Equipment9

Psychiatry and Psychology2

Phenomena and Processes20

Disciplines and Occupations1

Anthropology, Education, Sociology and Social Phenomena3

Technology, Industry, Agriculture1

Named Groups2

Pupillary constriction8

Dilate or constrict4

Dilation and constriction2

Sphincter6

Miosis3

Dilator muscle1

Results in constriction1

Muscles4

Examining pupil dilation1

Measure pupil dilation5

React11

Tonic pupil4

Consensual light reflex1

Ciliary ganglion1

Morphine1

Allow the pupil3

Relative afferent2

Afferent2

Anisocoria2

Sympathetic3

Size43

Blood vessels2

Cat's1

Person's3

Responses9

Light reflex1

Iris6

Pinpoint pupils4

RAPD6

Dilates1

Dilatation1

Brighter1

Parasympathetic system1

Equally2

Response10

Stimuli5

Darker1

Sphincters1

Neurological1

Reactivity1

Defect1

Bright13

Eyes11

Stimulation2

Eyestrain1

Heartbeat1

Reaction2

Induces1

Horner's2

Anxiety1

Arousal3

Small9

Conversely1

Unequal1

Loewenfeld1

Expands1

Amount of light1

Responds1

Change1

Midbrain1