Response of the pupil ?

What is the response of the pupil contained by the right eye if the light is shone on the contrasting eye?
If it affects the right eye too what is the reason. What is the machine behind it?

Answer:    In medication, there are two pupillary reflexes-

The pupillary oil lamp reflex is the reduction of pupil size contained by response to light.
The pupillary temporary housing reflex is the reduction of pupil size surrounded by response to an object coming close to the eye.
Both these reflex affect both eyes, even if only one eye is stimulated.

The stencil of papillary response to light can oblige determine which of the cranial nerves is damaged. There are two types of response assessed for respectively eye:

Direct pupillary reflex: whether each pupil constricts near light shone into that eye
Consensual pupillary reflex: whether respectively pupil constricts with lighting shone into the other eye
A light shown into the gone eye will cause the pupil within BOTH pupils to constrict.

The reasonsing behind this is how the nerves going to and from the eye to the brain are wired. Specifically about cranial nerves II and III and the parasympathetic nerves of cranial nerve III.

It is too detailed to turn into in this type of forum. However, necessarily input from one eye travels back to the brain, and can effect the travels of the opposite eye.
The medial longitudinal fissure (or longitudinal intellectual fissure, or longitudinal fissure, or interhemispheric fissure) is the deep groove which separates the two hemispheres of the vertebrate brain.

This is why the moved out side of the brain often respondes near the right side.
Light goes into the eye and stimulates the retina. The retinal notion travels by the optic nerve, to the brain. In the brain in that are some way stations where on earth the message from the eye is divided up. Some of the message goes to the fund of the brain where it is next analyzed and one becomes aware that that's a dog, or tree or ? From one of the path stations, the nerves travel to the third craneal nerve.

The third craneal brashness is called the oculomotor self-confidence. Its primary function is to furnish impulses to some of the muscles of the eyeballs, close to the ones toward the nose, the one on the top, the one on the bottom.

On the top of the thrid fortitude is a nucleus that sends messages to both eyes, to the muscle that controls the round muscle of the iris, the sphincter. It makes the pupils smaller when it's stimulated.

When a enduring amount of light is sent into one eye, it go to the brain, to the pupil center so to speak, and sends a message back to both pupils, so they both catch small or become miotic the same amount.

Put 10 unit of light into the eye, bring back 10 units of pupil getting small. Shine the flimsy into the other eye, 10 units surrounded by, both pupils get small like 10 units.

Unit doesn't imply anything, just a word for the 'amount' of muted we're using.

But what if there's something wrong with one of the eyes. Say for instance that one of the nerves going from the eye to the brain, is tatty or sick. Then when you shine 10 units of night light into the other eye, both eyes respond with a small 10 element pupil. Shine the 10 units into the tatty nerve eye and the brain think it's only getting 4 unit, so the pupils don't get 10 unit small, they only get hold of 4 units small.

This is the font of the tests for the pupils. Shine the wispy in one eye...both eyes move about down. shine the light within the other eye, both eyes go down. So the DIRECT response to fluffy is OK.

Then shine the light into one eye, and after the pupils step down, switch the light over to the other eye, the pupils SHOULD stay indistinguishable small amount. This is the CONSENSUAL response.

But if they don't stay the same size more or smaller amount, and when the light is shined into one of the eyes and the pupil seem to dilate a bit, something is wrong. This is called the swinging flashlight audition. Both pupils should remain about duplicate as the light is moved rear and forth between the two eyes. If there's damage later when the light is shined into one eye..both capture small, then when the wishy-washy is shined into the other eye, the pupils seem to dilate.

If the eye is totally blind, that's sort of different though along indistinguishable lines. If light is shined into that blind eye, zilch happens to the pupils. When shined into the suitable eye, both pupils will get small.

The problem could be for lots of reason. The optic nerve could be shabby such as in Multiple Sclerosis, Optic atrophy, optic neuritis (think smoking or inflammatory conditions such as Temporal Arteritis or within younger people Acute Anterior Optic neuritis or neuorpathy), a tumor contained by the nerve or the orbit or further rear legs towards the brain or in the brain, or a stroke or...Also the pupil could be tattered as in the iris sphinter such as occur when people catch hit directly in the eye, the fortitude to the pupil could be damaged, the retina may enjoy a problem such as diabetes (which could also affect the oculomotor nerve) and not be able to pick up or transmit the frothy or light signal.

There's another side to this and that's the dilator muscle within the iris, which is controlled by the sympathetic nervous system. It works when things grasp exciting...fear, anger, flight or mle stuff. There's a little ganglion call the ciliary ganglion behind the eye surrounded by the orbit that's involved with this.

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