Is there any cure for pupil dilation?

In daily life, the pupil is a very important part of the body, and problems with the pupil not only indicate eye disease, but also represent a manifestation of physical disease. Pupil dilation refers to a manifestation of a person entering a deep coma or approaching death. Generally, pupil dilation begins to dilate when the human brain enters a state of severe loss of consciousness, and timely rescue is required.

Is there any cure for pupil dilation?

In certain specific circumstances, the pupils of a person begin to dilate and enlarge before they are completely dead.

For example, after the patient is severely poisoned. Or in a coma, the brain stem is close to death, or has entered a vegetative state, the body is shrunken and the muscles are stiff. At this time, the patient's autonomic regulation function has been slowly lost, and the sphincter that controls the pupil is

The body begins to relax, the pupils gradually dilate, and there will be no reflection or luster. After the body officially dies, in addition to the dilated pupils, the cornea will also become turbid due to loss of moisture. over time. The turbidity will deepen. Under normal circumstances. The urine is slightly turbid 6 to 12 hours after death. 12~24 hours. The turbidity is still deepening

But this time. You should still be able to see through the pupils, but after 48 hours, the pupils will become heavily cloudy and you will no longer be able to see through them. What you see at this time is what people generally call the gray pupils of a corpse.

Dilated pupils

Signals from the sympathetic nerves cause the mydriasis muscles to contract, thereby dilating the pupil. Damage to the facial sympathetic nerves can cause unilateral miosis

Human pupils also dilate when we see something that interests us or when we become excited. Psychological research has found that faces with larger-than-average pupils, especially women's faces, are considered more beautiful.

Drugs such as atropine can dilate the pupil and are used in optometry to eliminate the effects of the pupillary reflex during eye examination. In addition, drugs such as LSD and cocaine can also cause pupil dilation.

Pupil dilation is used to determine death. When the eye encounters bright light, the iris sphincter contracts, causing the pupil to shrink to protect the fundus. This process is controlled by the brainstem. Therefore, in medicine, loss of pupillary reflex is used to determine death.

Pupil position

The anterior part of the vascular membrane of the eyeball, namely the center of the sclera and the circular hole. The smooth muscle arranged in a ring along the pupil is called the pupillary sphincter. When the sphincter contracts, the pupil shrinks. The smooth muscles arranged radially along the pupil are called pupil dilating muscles. The pupil dilates when the dilating muscle contracts. Since the pupil can dilate or constrict, it can regulate the amount of light entering the eye. A normal person's pupil can adjust its size reflexively. When the light increases, the pupil shrinks; when the light decreases, the pupil dilates. If the pupillary reflex is abnormal or disappears, it indicates that the regulatory function of the nervous system is impaired. Therefore, the pupil light reflex is often used clinically to examine the functional state of the nervous system.

Pupil size

Pupil size varies with age, race, refractive status, light intensity, target distance and emotional changes. It is generally 2 to 5 mm, with an average of about 4 mm.

The pupils of a newborn are very small and begin to dilate three weeks after birth. Young people have larger pupils than middle-aged people. People aged 20 to 50 have pupils of 2 to 3 mm in sunlight, and shrink again in old age. The pupils of farsighted eyes are smaller, while those of myopic eyes are larger. The pupils of Caucasians are slightly larger than those of Asians. When both eyes are looking forward, the pupils are equal or the difference is less than 1 mm. When the eyes are tilted to one side, the pupil of the outward eye is slightly larger than the pupil of the inward eye. The pupils are constricted when the eyes are asleep or in bright light, and larger in the dark. The pupils are constricted when looking at near objects, and larger when looking at distant objects.