Why do eyes see? Why can the eye see?

The eye is a very important visual organ, and the human eye is composed of eyeballs, eyelids, eyelashes, lacrimal glands and other auxiliary organs.

The eyeball grows in the eye socket, is round, and has a very complex structure. The eyeball is made up of a clear cornea, iris, pupil, lens, retina, and optic nerve. The cornea is located at the front of the eyeball and helps with focusing.

The iris is brownish-black, grows behind the cornea, is circular, and can be contracted and magnified to control how much light enters the eye. There is a small oval hole in the middle of the iris, called the pupil, which is what we often call the "black eyeball", and it is from this pupil that light enters our eyes.

The transparent lens is located behind the iris and looks like a convex lens that can be used to focus. The retina is one of the most important structures that the eye can see because of its light sensitivity.

When we look at things. At this time, light from the object passes through the cornea and pupil and enters the eye, where it is focused by the lens to form a clear inverted image on the retina. The optic nerve on the retina then transmits the image to the brain.

Our brains can correct the upside-down image and see things.

The eye projects light into the light-sensitive retina, where it is received and converted into signals that are transmitted to the brain through the optic nerve. Usually the eye is spherical, filled with a clear, gel-like substance, with a lens for focusing, and usually an iris that controls how much light enters the eye.

The eye is the most important organ of the human senses, and about 80% of the knowledge in the brain is acquired through the eye. Some things such as reading and reading, reading and appreciating pictures, looking at people, and enjoying beautiful scenery all need to use the eyes. The eye can distinguish between different colors and the brightness of light, and convert this information into nerve signals that are transmitted to the brain.

Structure of the human eye: The eye is a complex organ made up of many tiny parts, each of which is essential for normal vision. Clear vision depends on the coordination of all parts of the eye.

A person can see a specific object such as a tree by reflecting the tree into the human eye through light, from the cornea into the eye, which is a thin film on the surface of the eyeball. However, light passes through the iris (the pigmented membrane in front of the eyes), and in the middle is the pupil. The iris controls the amount of light entering by constricting the pupil.

The lens projects light onto the retina. The cornea performs maximum refraction, while the lens suspension is delicately focused. Healthy eyes that automatically adjust to the distance of the object and can be clear**.

When the object is near, the ciliary muscle of the eye contracts and the lens convexity increases. When looking at distant objects, the ciliary muscles relax and the lens convexity decreases. Behind the lens and in front of the retina is the vitreous, which contains a clear, gelatinous substance called vitreous fluid.

Light enters the retina through the vitreous. The retina covers two-thirds of the eye and controls the width of vision. When vision is clear, light energy is focused directly on the retina.

If light rays are focused in front of or behind the retina, vision will be blurred. The retina is made up of millions of cells that specialize in receiving light, called retinal rod cones, which turn light into electrical signals that are transmitted to the brain through the optic nerve. The retinal rod cone has the function of observing and recognizing various colors in the dark.

The macula, located in the middle of the retina, is the part with the most cones. The small concave in the middle of the macula is where the pyramid is most concentrated. The macula is responsible for central vision, recognizing colors and details of objects.

The periretina is dominated by rods, which can recognize motion and objects on both sides in the dark**. The optic nerve is located behind the retina and is responsible for transmitting signals from light-receiving cells to the brain. Each eye transmits a slightly different image signal.

The image is inverted. When it reaches the brain, the image is corrected to form an image. The complex process of analyzing the data transmitted by the optic nerve is called the visual process.