How Does the Human Eye Work?

The human eye is an organ that responds to light and has multiple uses. As the organ of consciousness, the eyes possess vision. Rod cells and cone cells in the retina possess light perception and vision including color differentiation and deep consciousness. Human eyes can distinguish about 10 million colors.

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The eye is not a complete sphere, but a fused two-piece unit. The smaller unit is in front and has a larger arc, and the part called the cornea is connected with the part called the sclera. The corneal segment is usually 8 mm (0.3 inches) in radius. The sclera constitutes the remaining five-sixths, with a typical radius of approximately 12 mm. The cornea and sclera are connected by a ring called the limbus. The iris-the color of the eye-and its black center, the pupil, replaces the cornea as the visible part because the cornea is transparent. Because the light will not be reflected, the inside of the eye requires a ocular curvature lens. The fundus (area opposite to the pupil) exhibits the characteristics of the optical disc surface (optical nipple), from which all light from the eyes passes through the optic nerve fibers and leaves the eyeball.

The field of view of the human eye is approximately 95 ° outward, 60 ° inward, 60 ° upward, and 75 ° downward. Defective optic nerve or

Close-range vision adjustment involves three processes that focus the image on the retina.

There are many diseases, physical and mental disorders, and age-related factors that can change the structure of the eyes and surroundings.

The change of the eyes with age can undoubtedly be completely attributed to the aging process. Many physiological and structural procedures gradually decline (aging) with age. Along with aging, the deterioration of visual quality is the sole cause of aging of eye diseases. Although there are many changes in the eye that have nothing to do with the disease, the most significant functional changes appear to be a decrease in pupil size and a decrease in the ability to adjust focal length

There are sufficient reasons for the complexity of the human eye to be cared for and cared for by professional physicians other than general practitioners. These specialists or eye care professionals have different functions in different countries. Each eye care professional can generally be classified into one or more of the following types (that is, in some cases, the ophthalmologist can perform surgery through the lens; this is usually the responsibility of an optometrist) Duties:

• Ophthalmologist

• Sight Corrector

• Optometrist

• Optical instrument maker