Why are human pupils sometimes so large and sometimes so small?

Hello, glad to answer for you!

In addition to the change of pupil size with the intensity of light, it is also related to factors such as age, refraction, and physiological state. For example, the pupils are small in older people, while those in young children to adults have larger pupils, especially during puberty. The pupil is larger in patients with myopia than in patients with hyperopia.

The pupils will open when they are nervous or excited, and they will dilate when they breathe deeply, do mental work, or sleep.

This symptom is governed by the nervous system!

Wishing you health and happiness!

When you look at something, your pupils dilate!

When the light is bright, the pupils are narrowed; When the light is dark, the pupils become larger.

When the light suddenly dims, there is a brief period of blindness, during which the pupils become larger to let in enough light to be able to see objects even in the dark.

The pupil is to control the amount of light entering the eye When the light is strong, the pupil will contract to ensure that the appropriate amount of light enters the eye, and when the light is insufficient and the environment is dark, the pupil will dilate, so that as much light can enter the eye, so that you can see things clearly.

Pupils to dilate and reduce.

The main thing is the strong self of light.

The pupil is like the aperture of a camera, the light is strong when it is narrow, and the light is weak when it is dilated. The pupils will be narrowed when the light is strong for a long time, and dilated when the light is low or dark. The pupil is a small round hole in the middle of the iris that is surrounded by the iris.

The iris in the eye is disc-shaped ,..

When people are nervous and excited, their pupils will dilate.

How can I control the size of my pupils?

Both the visual pathway and the visual afferent pathway, which part of these two aspects are affected, may cause pupil dilation, as follows:

1. The pupil is innervated by the pupillary sphincter and the pupil dilation muscle, which may cause paralysis of the pupil sphincter when subjected to trauma, which will cause pupil dilation, or iris avulsion, or may cause irregular pupil dilation, resulting in cycloplegia.

2. For example, using some paralytic drugs for the ciliary muscle, often doing dilated refraction, and dropping compound tropicamide or atropine eye drops can also cause pupil dilation, and with the decrease of drug effect, the pupil will gradually return.

3. Lesions of the central nervous system, such as cerebral hemorrhage and cerebral congestion, can also be accompanied by narrowing or dilation of the pupil.