Information about the cornea, what is the cornea?

Cornea. It is the eye most.

Front. The transparent part is covered.

Iris. Pupil. And. Anterior chamber.

and provides most of it for the eyes.

Refraction. Force. Plus.

Lens. of diopters, light.

can focus accurately.

Retina. on the composition.

Image. In the refractive system of the human eye, the cornea has the strongest refractive ability because it is in direct contact with air. The cornea is very sensitive.

Nerve endings. If any.

Foreign objects. Contact with the cornea, eyelids.

will involuntarily close it.

Protect your eyes. In order to remain transparent, the cornea does not.

Blood vessels. Permeance. Tear. And.

Aqueous humor. Get nutrients and.

Oxygen. Human cornea.

Diameter. about millimeters, center.

Thickness. There are about to millimeters, edges.

The thickness is about millimeters.

It is about the specifications of the size of the cornea.

Interpretation of the cornea (1) [cornea].

2) The transparent part of the outer membrane of the eyeball, which covers the iris and pupil, allowing light to enter (3) Arthropods The transparent covering of the outer layer of the compound eye explains in detail A transparent film on the surface of the dark eyeball. The posterior part is connected to the sclera. Light from the outside enters the inside of the eye through the cornea.

Wu Yunduo, "Dedicating Everything to the Party, Sincere Friendship": Filatov is an academician of the USSR Academy of Sciences, has 50 years of medical experience, and invented the 'corneal transplantation' in ophthalmology. ”

Word decomposition Explanation of the buried posture of the horn horn ǎ The hard thing that grows out of the head of a cow, sheep, deer, etc.: horns. Antlers.

Horn. . Shaped like an angular:

Water caltrop. Soaphorn. A pointed land mass (mostly used for place names) that protrudes into the sea

Chengshanjiao (in Shandong Province, China). Geometry refers to the flat part sandwiched between two straight lines from a point: Interpretation of the membrane The membrane bends to imitate the thin skin of the tissue in the body of animals and plants

Pleura. Eardrum. Mucous membrane.

Reed film. Worship Kneel on the ground and raise your hands and bow reverently. Like a thin skin of a membrane:

Milk has a thin film on its surface. Radical : month.

The cornea is a clear film at the tip of the eye. The cornea is completely clear, located in the anterior part of the eyeball, and has a transverse oval shape. The cornea has very sensitive nerve endings, and if a foreign object comes into contact with the cornea, the eyelid will involuntarily close to protect the eye.

The cornea, which makes up the pupil, is the most sensitive part of the whole body, especially touch and pain.

If the eye is compared to a camera, the cornea is the lens of the camera, and the eyelids and tears are the devices that protect the lens. Without us being aware of it, the eyelids blink, and with each blink, there are tears that cover the surface of the cornea with a thin film of tears that protect the lens .

Since the cornea is a rough and transparent lens, there are no blood vessels on it. Therefore, the cornea of the eye is nourished by tears, and if the nutrients contained in tears are not sufficient, the cornea will become dry and its transparency will be reduced.

The horn and stool membrane are an important part of the eye, so it is important to protect them.

Everyone wants to have a pair of good eyes and a good eyesight, especially now that there are more and more myopic children, which not only makes parents worried, but also seriously affects children's life and learning. Therefore, once the child is found to be myopia, it must be timely**. Generally, doctors recommend taking Leyan Vision Nutrients, taking them with warm water, and insisting on taking them for a period of time, which can protect children's eyesight, prevent the occurrence of myopia, reduce myopia, and have a good effect on eye development.

The role of the cornea If the cornea becomes cloudy, it is like the lens of a camera is worn out, which will affect the quality of the camera's images. If the replacement is hollowed into a transparent good lens, and the remaining burial can illuminate a clear **, this is what we usually call corneal transplantation. Therefore, the prerequisite for corneal transplantation is to confirm that the retina and the optic nerve and the visual center of the brain are functioning properly, because without good film, it is useless to simply change the lens. The normal cornea is as transparent and clear as a crystal, also known as the "black eyeball", which is equivalent to a transparent window in the structure of the human eye, although it is only half a millimeter thick, it not only forms the outer wall of the eye, but also has a strong focusing function to focus the light on the retina.

Introduction, corneal transplantation is the replacement of the patient's cornea with a normal cornea. It is also known or controlled to improve the vision of the middle bridge and the method of certain corneal diseases.

1. The cornea is an important refractive medium of the eyeball. Corneal thickness can be used for the diagnosis of many diseases and in preparation for corneal refractive surgery. Under normal circumstances, the thickness of the cornea in adults is about the thickness of the cornea, and the thickness of the periphery is about.

2. The examination of corneal thickness can be done in the following ways:

1. Ultrasonic corneal thickness gauge, which is the most commonly used method at present;

2. Optical shield quiet measurement method;

3. Ultrasound biological microscopy measurement method;

4. Optical coherence tomography method;

5. Contact or non-contact endokeratoscopy;

6. Bausch & Lomb's anterior segment analysis and diagnosis system.

These methods allow for accurate measurement of corneal thickness.

Cornea donation refers to donation after death, but the relevant procedures must be completed before death. The donor must be willing before his death or agreed by his or her family after death, in order to respect the principle of voluntariness. Age 5 to 60 years old is good, can be relaxed to 70 years old, if used for medical research is not limited by age and disease, cornea or eyeball donation is free.

In today's world, voluntary donations are made free of charge.

The donor must be willing before his death or agreed by his or her family after death, in order to respect the principle of voluntariness. Age 5 to 60 years old is good, but it can be relaxed to 70 years old. If it is used for medical research, it is not limited by age or disease.

Cornea removal is limited by many conditions, such as death certificate, whether there is an infectious disease, time of death, etc., depending on environmental factors. Generally, it is within 6 hours after death, and it can be within 12 hours in winter. Donation of corneas or eyeballs is unpaid.

In today's world, voluntary donations are made free of charge.

Donation Notice. Donating an eyeball or cornea is a donation after death. But before you die, you have to go through the formalities. Voluntary donors can go to the local provincial eye bank to obtain registration**, and you need to clearly fill in the "voluntary" form and sign it from your family members.

This ** volunteer and the hospital party each keep one copy. Registration can also be obtained by post**.

Related questions. Corneas cannot be donated by a living person.

Volunteer Club Cornea Donation Event.

According to Chinese law, a living person cannot donate his cornea before his death, because if he donates his cornea, he will not be able to see his eye and become disabled, which is against morality and ethics, so it is not allowed. However, you can fill out a letter of intent to donate your cornea and donate your cornea after death.

How do cornea donors go through the procedures for cornea donation?

Cornea donation refers to donation after death, but the relevant procedures must be completed before death.

What are the requirements for people who donate corneas?

The donor must be willing before his death or with the consent of his or her family after death, in order to respect the principle of voluntariness. Ages 6 to 60 are preferred. If it is used for medical research, it is not limited by age or disease.

Where can I get my cornea for a cornea donor?

The cornea is limited by many conditions, such as death certificate, whether there is an infectious disease, the time of death, etc., so it is unlikely to be collected at home.

The cornea is equivalent to the lens of a camera, and if it is removed, it cannot be imaged in the fundus, and the cornea of the eye is broken when you can't see anything, and the cornea of the donor can be replaced as long as the rejection problem is solved, and the curvature of the cornea of animals is different from that of people, and it is difficult for xenospecies animals to survive due to rejection.

According to foreign reports, researchers in Canada and Sweden have successfully restored vision to some people with eye diseases using artificial corneas, avoiding the danger of blindness. The results in these patients were almost identical to those of receiving cornea donation. This breakthrough will give hope to millions of blind people to regain their sight.

The cloning of human organs is still only in the research stage, involving many factors such as technical means and ethics, and it is not realistic at present, but there is hope that it will be realized in the future.

The cornea is an inseparable part of the eyeball that disappeared during human evolution if it was not needed!

Now medicine can transplant an artificial cornea, which is called a dry cornea. Last year, I experienced a patient's eyes changed!

1. The cornea is the "wall" in front of the eyeball. Without the cornea, the room of the eyeball is incomplete, and the "aqueous humor" inside is "leaking". Aqueous humor is essential for maintaining the shape of the eye and providing nutrients for its contents.

2. The outer wall of the cornea and other parts of the eye is a complete whole, and no other material can replace it. (The plastic film cannot grow as a whole with the outer membrane of other parts of the eye).

3. At present, there is no world-recognized and successful cloning technology for human use. (At the moment, it can only be tested on animals).