What is the basic structure and size of the human eye?
Human Eye
Human Eye Anatomy
The eye is one of the essential organs in the body. Two healthy eyes mean a clear vision, which plays a significant role in daily life and the quality of the experience.
The human eye is an organ of the brain that responds to light and allows for vision.
The rod and cone cells in the retina are photoreceptive cells that can receive visible light and transmit this information to the brain.
The brain uses eye signal information to detect color vision, posture, depth, movement, and other features.
Like the eyes of other mammals, ganglion cells of the non-photographic imagery in the retina receive light signals that affect student size adjustment, regulation and suppression of the hormone melatonin, and circadian rhythms.
Humans have binocular vision, which means that both eyes form a single integrated image. The material creates an image, which is further understood and interpreted by the brain by connecting neurons. All machines work in a complex way.
Overview:
Humans have two eyes, one on the left and the other on the right. The eyes live in the bone marrow called orbits, in the skull.
Six additional muscles control the movement of the eyes. The visible part of the eye is made up of the white sclera, the colored iris, and the reader.
A thin layer called the conjunctiva sits on top of this. The front part is also called the inner part of the eye.
The eye is not designed to be complete but rather a two-piece unit of the front (front) and the back (back).
The inner part is made up of the cornea, iris, and lens. The cornea is more transparent and more curved, and is connected to a large posterior part, made up of the vitreous, retina, choroid, and white outer shell called the sclera.
The cornea is about 11.5 mm comprehensive (0.45 in) and 0.5 mm (500 μm) in diameter near its base. The backroom makes up the remaining five-six; its diameter is about 24 mm (0.94 in).
The cornea and sclera are connected to an area called the limbus. The iris is a circular shape focusing on the center of the eye, the pupil, which appears black.
The size of the pupil, which controls the amount of light entering the eye, is adjusted by the iris and sphincter muscles.
The light energy enters the eye through the cornea, passes through the pupil and the lens.
The position of the lens is adjusted to the adjacent focus (residence) and is controlled by the ciliary muscle.
Photons of light that fall on the retina-sensitive cells (photoreceptor cones and rods) are converted into electrical signals transmitted to the brain by the optic nerve and translated as vision and vision.
Elements of the Structure of the Eye
This natural camera is made up of:
External Components
The eyelids are the outer protective parts of the eye. They serve as 'locks' and the main obstacles facing the external environment.
The borders of the eyelids are covered with tiny hairs called eyelashes.
As we pass through the eyebrows, the next thing is the round front of the circular eyeball, called the cornea.
The cornea is the first optical component of the visual system, which deals directly with incoming light. Its function is primarily a filter before transmitting the morning to the lens and retina.
The frontal lobe of the eye is called the iris. Iris is a colored structure. Eye color (black, brown, blue, etc.) is defined by the color of the iris. The opening in the middle of the iris is called the student.
It has a circular shape and allows light to pass through the lens. Like the opening of the camera, it controls the amount of light that enters.
In sandy areas, the eyeball is intense, while in the dark, it expands.
The process of student expansion and contraction is not a quick one.
This is why we do not see anything for a few seconds when we enter from sunlight to dark medium, and also because we cannot keep our eyes open when we suddenly turn on the lights in the middle of the night.
Internal components:
Located right behind the reader is a visual structure called the lens, which focuses on the correct focus of the graphic. It is flexible and adapts accordingly to outdoor lighting.
The lens is fitted with a small transparent body and is connected to the natural eye by two muscles. It also illuminates the light, and it helps to direct it right behind the retina.
The retina is the very inner layer of the eyeball structure. The retinal membrane can be thought of as a wall where images are exposed.
Light passing through the cornea, pupil, and lens focuses on the retina membrane. In addition to tissue, the retina comprises two types of cells: rod cells and lump cells.
The former is considered to be less light-sighted, while the latter is considered to be less luminous. Cones play a vital role in recognizing images in vivid contrast.
The deficiency of any cell can cause abnormalities in visual function.
Eyeball Anatomy
The retinal membrane contains a space called the macula, which is yellow. The center of the macula is called the fovea, which includes a high density of lump cells.
The image presented in the fovea is usually the visual memory that is registered most accurately.
The sclera is a protective outer garment with an outer layer of the eyeball. It is essential to be strong compared to the delicate internal structures within the eyeball.
The choroid is the layer between the eyeball wall, bound between the retina and the sclera. It also helps to clear the vision by absorbing excess light.
The muscle that attaches the sclera to the iris is called the ciliary body, which plays a role in the dynamic focus of the image through the lens.
Sensory systems begin to play when the incoming light is filtered, displayed, and emitted correctly to produce the image behind the eyeball.
The part of the optic nerve attached to the back of the eyeball is called the optic disc. This is the region where rod cells and lump cells are under attack. Therefore, any image presented in this area is usually non-existent.
It is also called the 'blind spot' for this reason. Optic nerves that connect eyeballs to the brain are responsible for optical transmission to the brain, where processing is beneficial.
The complexity of eye makeup is enormous, and although it is considered a well-understood structure, new information about it continues to emerge during ongoing research.
Sources
- https://www.allaboutvision.com/resources/anatomy.htm
- https://www.moorfields.nhs.uk/content/anatomy-eye
- https://nei.nih.gov/photo/anatomy-of-eye
Size:
Its size varies in adults by only one or two millimeters. The eye is usually longer than the widest.
The average height (height) of the human eye is approximately 23.7 mm (0.93 in).
The shortest diameter (width) is 24.2 mm (0.95 in).
The depth of eye is 22.0-24.8 mm (0.87) - 0.98 in)
There are no significant differences between gender and age groups.
A strong correlation was found between the rotational width and the orbit width (r = 0.88). [2] The average adult eye has an inner diameter with a rear diameter of 24 mm (0.94 in) and a volume of six cubic inches (0.37 cu in).
The eyeball proliferates. After 12 years, the eye is reaching full size.
You must be logged in to post a comment.