How The Working Principle of the Human Eye

How The Working Principle of the Human Eye

How The Working Principle of the Human Eye

Your eyes are like a camera. Unlike the camera, when people look at things, the eye is focused on the extremely sensitive retina, rather than on the photographic film. The following is the process of eye operation:

The cornea is a transparent tissue located in the front of the eye that helps to focus on the light of the eye. After the cornea of ​the pigment film for the iris, the iris has an adjustable size of the circle, called the pupil. The pupil will be larger or smaller depending on the amount of light entering the eye.

Between the cornea and the iris, there is a layer of transparent water-like liquid, called eye water. After the pupil has a transparent crystal structure, called the lens. Around the lens of the ciliary muscle in the eye, operation process plays a significant role. People look at the distance of the object, connected to the lens ciliary muscle relaxation, so that the lens becomes flat, in order to see the distant objects. While people look at the near objects, the ciliary muscle contraction, so that the lens thicker so that the eyes can clearly see things in the vicinity.

After passing through the lens, the light passes through a jelly called vitreous and then reaches a very sensitive retina. The retina is the three layers of the eye that are located in the innermost layer. The outermost layer called sclera, it is the toughest organization, but also the eye appears white reason. The cornea is also part of the outermost tissue. The next intermediate layer is called choroid, which is between the sclera and the retina time, containing blood vessels, delivering nutrients and oxygen to the retina.

There are millions of photoreceptors in the retina. Photoreceptors are divided into two categories: red cells and cones. The rod cells make people see things in the light of the weak places, the cone cells are people have color vision. Cone cells are mainly concentrated in the retina of the central fossa, the central fossa in the macular area so that the highest sensitivity of the site. When the light reaches the photoreceptor cells, the eye sends the signal through the visual nerve to the brain. The brain converts these signals into images we see.For more information, please click on the following link:

The importance of eye examination

Regularly check the eyes, protect eyes and eyesight

Vision is one of our most important and needs to cherish. The gathering and delivery of light is an extremely complex and sophisticated process through which we have a clear vision (please read the working principle of the eye). We are getting older, eyes and their sensitive mechanical operations may be damaged or infected with the disease. Therefore, more attention to visual changes can help you early detection of eye problems.

Glaucoma and diabetic retinopathy and other eye diseases, in the early stages of the disease, is no symptoms. Patients often come to the late to find themselves sick, which makes eye problems more difficult to deal with, treatment has become more difficult. Therefore, regular eye examination can help early diagnosis and treatment of the disease and can slow the deterioration of the disease, and even reverse the progress of eye disease.

How to check the eye?

Eye check without any pain. Basic eye examinations include eyelids and around the eyes. The doctor will also check the conjunctiva, sclera, cornea and iris in order to find any symptoms of eye disease.

Common eye exams also include:

Visual test (with or without wearing corrective glasses)

Detection of pupil response

Overall eye muscle examination

Peripheral vision test

Use an upright microscope (slit lamp) to check the front section of the eye

Eye pressure detection

Eye part of the inspection

How often do I check my eyes?

Baby (3 years old or below)

When a pediatrician is checking him/her, ask the doctor to check his / her eyes. Should pay attention to children with eye symptoms include strabismus, amblyopia, and children with myopia.

Children and teens (4 to 16 years old)

Children should be checked at the age of four. Please ensure that your child undergoes regular eye checks every two years.

Youth (17 to 39 years old)

If you have a family history of eye disease or your eyes have been traumatic, you should accept a detailed and comprehensive eye examination.

Adult and old (40 to 64 years old)

With age aging, eye-related diseases may occur. You should be aware of whether the following symptoms appear in the eyes: vision changes, eye pain, itching and dry eye, visual field flash, floating objects or curves. In order to detect any changes in vision, adults once to 40 years of age, should accept the basic vision test. The doctor will evaluate and tell you how long it will take the follow-up check.

People with high-risk factors for eye disease

If you have risk factors for eye disease (such as diabetes, high blood pressure, glaucoma and other eye disease family history, or is taking the impact of vision on the drug), then you need to often find your ophthalmologist clinic, and to the doctor Ask a reasonable follow-up time.