Is this normal? when I hold a flashlight towards my pupils they get small than start regrowing in and out?

Question

im not changing the light position at all, they get bigger than smaller, bigger than smaller, whats up with this?

Answer 1

It means you are dying.

EDIT--I just read the rest of your questions. You definitely have hypochondria or an anxiety problem. You should see a psychologist or therapist. They can give you medication or "tools" to help you. I meant my original answer as a joke. Your pupils are supposed to do that.

Answer 2

The resting size of each pupil and their respective responses to light shone through them are the best indicators of the status of a patient's brain. These are also the best predictors of the likelihood of good or bad outcome in cases of brain tumors, head trauma, hydrocephalus, etc.
The pupil is the opening into the eyeball through which light passes to reach the retina and stimulate the neural pathways of visual perception. The size of the pupil determines the amount of light that passes into the eyeball (a globe lined inside by layers of cells collectively called "the retina").

The size of the pupil is regulated by the amount of light in the around the eye. The brighter the exterior environment, the less light is required by the retina and the smaller the pupil should be. The darker the exterior, the larger the pupillary opening required for adequate retinal stimulation.

The size of the pupil is controlled by two different nerves: one that dilates (widens, enlarges), the other that constricts, it. The nerve that enlarges the pupil comes from the sympathetic nervous system that controls the "fight or flight" response to stressful and/or dangerous situations (when people are afraid thier pupil actually becomes larger). The nerve that constricts the pupil comes from the parasympathetic nervous system that controls the vegetative (eating, sleeping, eliminating, ...) functions.

Causes of pupillary dilatation would include overactivity of the sympathetic pupillary nerve or underactivity of the parasympathetic.

The parasympathetic and sympathetic nerves to the pupils are themselves controlled by the brain. The brain regulates pupillary size in response to retinal activity which depends on light input. Any condition or disease that prevents the retina from receiving or transmitting light information will affect the ability of the brain to regulate pupillary size in response to light.

Clinical conditions associated with dilated pupil: overactive sympathetic,
Disease: stress response;
underactive parasympathetic;

Disease aneurysm posterior communicating artery; Mechanism: pushing against parasympathetic nerve to pupil;

Disease: diabetes, Mechanism: ischemia due to narrowing of small vessels that supply and sustain the nerve

No light input: injury to eye, optic nerve, etc.

In other words, it's perfectly normal for the pupil to constrict when light is shined on it. And it dilates in the darkness. This is how we check if there is any brain activity in comatose pts.

Answer 3

The pupil is a circular hole in the middle of the iris which regulates the amount of light passing through to the retina. In dark conditions the pupil expands - or 'dilates' - to allow as much light as possible pass through. In bright conditions the pupil shrinks, limiting the amount of light passing through.

Answer 4

yes. when the lights are off your pupils get big to catch any light the can and retursmall when they reciveve a large amount of light such as turning on the light or in you case holding a flashlight to your eyes.

Answer 5

I think it's because there's too much light and your eye is like a photolens on a camera working on automatic and its trying to focus and you're over exposed

Answer 6

medical personnel use it to check for neurologic damage. it is normal and your eyes are suppost to react like that. medical people check for PERRLA Pupils Equal and Regular; Reactive to Light and Accommodation.

Answer 7

that is completely normal, everyone's eyes do that to adjust to the light