The role of aqueous humor The main functions of aqueous humor are:

Aqueous humor: It plays a very important role in maintaining the normal physiological function of the cornea and lens and maintaining their transparency. When there are harmful substances or circulatory disorders in the aqueous humor, the normal metabolism of the lens and cornea will be endangered, resulting in various pathologies.

Normally, there are no cells, pigments or other floats in the aqueous humor, and the protein content is minimal, so when a strong beam of light passes through the anterior chamber, it is not reflected, as if through a completely transparent "space".

However, under the influence of surgery, trauma or inflammation, prostaglandins are released, the blood-aqueous humor barrier is damaged, and the protein content in the aqueous humor can be greatly increased.

Aqueous humor Physiological characteristics:

Aqueous humor is formed by the ciliary body and contains large amounts of hyaluronic acid and septic acid. Aqueous humor fills the space between the cornea and the lens, and the iris divides it into the anterior and posterior chambers.

Physiological functions:1Aqueous humor flows between the anterior and posterior chambers to regulate intraocular pressure.

2.Aqueous humor helps the cornea and crystals to metabolize and maintain their transparency.

3.Aqueous humor can provide a part of the oxygen to the cornea and is one of the important oxygen needs of the cornea**.

4.Aqueous humor contains a large amount of glucose, which provides a material guarantee for the energy metabolism of the cornea.

Ultrafiltration: When the capillary pressure in the ciliary body exceeds the sum of intraocular pressure and plasma colloidal osmolality, ultrafiltration occurs, and the fluid enters the eye from the blood, and when the intraocular pressure rises, this effect is inhibited. Active transport role:

It is a metabolic activity that requires energy consumption and is mainly carried out in the pigment-free epithelium. This activity mainly causes sodium ions to enter the posterior chamber in one direction, and as a result, the concentration of sodium ions in the posterior chamber aqueous humor is greatly increased. In order to maintain the "static permeability order", moisture is attracted into the back room.

1. Ultrafiltration: When the capillary pressure in the ciliary body exceeds the sum of intraocular pressure and plasma colloidal osmotic pressure, ultrafiltration occurs, and the liquid enters the eye from the blood, and this effect is inhibited when the intraocular pressure rises.

2. Active transport: This is a metabolic activity that requires energy consumption, mainly in the pigment-free epithelium. This activity mainly caused sodium ions to enter the posterior chamber anterior beam in one direction, and as a result, the concentration of sodium ions in the posterior chamber aqueous humor was greatly increased.

In order to maintain the "static permeability order", moisture is attracted into the back room. The sodium ion is constantly fed into the back chamber because of the sodium pump, and the adenosine triphosphate enzyme activated for sodium-potassium is the main energy source for the sodium pump activity.

1) Provide nutrients and oxygen to the tissues in the eye, especially the cornea and lens, and discharge their metabolic products.

2) Maintain intraocular pressure. The production and discharge of aqueous humor is closely related to intraocular pressure, and the two are normally in equilibrium. When a certain factor causes the balance to be imbalanced, it can lead to an increase or decrease in intraocular pressure, causing damage to eye tissue and visual function.

3) It is one of the refractive interstitium, with a refractive effect, and the refractive index is.

Aqueous humor provides nutrients to the iris, cornea, and lens. Aqueous humor also has the function of maintaining intraocular pressure. Intraocular pressure—Intraocular pressure—depends on the amount of aqueous humor.

Originally, the fluid that filled between the cornea and the iris was produced by the ciliary body, passed through the pupil into the anterior chamber, and then discharged from the eyeball by the trabecular mesh of the anterior chamber angle. The aqueous humor system of the eye can be compared to a sink where the faucet is always open, and the drainage pipe of the eye is like a drain pipe connected to the sink, and if the kitchen sink is working properly, the water flowing from the faucet will drain smoothly and quickly from the sink. If the eye's aqueous humor system is working properly, the amount of aqueous humor produced should be exactly equal to the amount of aqueous humor discharged.

Intraocular pressure varies at different times of the day, but generally stays within a safe range. If there is too much aqueous humor or it cannot be drained, it will cause an increase in the fluid in the eye, which can lead to an increase in intraocular pressure. Elevated eye pressure can damage the optic nerve, making the field of vision smaller and eventually leading to blindness.

This eye disease with increased pressure in the eye is glaucoma. Aqueous humor also has a certain refractive function, and it forms the refractive system of the eye together with the cornea, lens, and vitreous.

The space between the aqueous humor behind the cornea and the iris is called the anterior chamber, the ** part is about deep, and the surrounding part is called the anterior chamber angle. Behind the iris, the annular space between the ciliary body and the equatorial part of the cumina lens is called the posterior chamber. The clear liquid that fills the anterior and posterior chambers is called aqueous humor.

Aqueous humor is produced by ciliary process epithelial cells, and the total amount is about water, which contains a small amount of chloride, protein, vitamin C, urea and inorganic salts, etc., and the aqueous humor is weakly alkaline, with a slightly higher specific gravity than water.

The main ways of aqueous humor production and excretion are: ciliary process epithelium produces aqueous humor, posterior chamber, pupil, anterior chamber, anterior chamber angle, trabecular meshwork, scleral venous sinus (Schlemm tube), through the collection tube and aqueous humor vein, and finally enters the anterior ciliary vein on the surface of the sclera and enters the systemic blood circulation. A small amount of aqueous humor is absorbed in the recesses on the surface of the iris, and a small amount of aqueous humor is absorbed through the suprachoroidal space.