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The ability that normal and healthy eyes should have, let's see if you have it

Posting time:2022-10-06 02:14:33

The ability that normal and healthy eyes should have, let's see if you have it

What does a pair of normal healthy eyes look like? Many people regard "seeing" and "seeing clearly" as the standard. Actually, not so. The doctor said that it is related to the following four aspects. 1. The color of the white of the eye The white of the eye is the "white eyeball" in our popular sense. Medically, it is called the sclera. Under normal circumstances, the main manifestations of healthy whites of the eyes are good gloss, porcelain white color, no bloodshot and spots, etc. If you notice the following changes in the whites of your eyes, you should be careful: Blue spots in the whites of the eyes - anemia Green spots in the whites of the eyes - intestinal obstruction Yellowing in the whites of the eyes - jaundice Red spots in the whites of the eyes - diabetes Blood film in the white of the eye - arteriosclerosis The reason why it appears black from the outside is actually the performance of the tissue inside the eye. Once the cornea is infected, it will cause corresponding lesions. Including infection, trauma, degeneration, etc., these may make the transparent cornea appear grayish-white turbidity, resulting in blurred vision, decreased vision, and even blindness in severe cases. 3. Normal pupils Under normal circumstances, the pupils are circular with a diameter of about 2.5-3mm, which can expand and contract with the intensity of light. Asian pupils are mostly brown, while Western countries are mostly blue. Of course, if you are wearing color contact lenses, that's another story. In addition to changes in physiological adjustment, once there is asymmetry of pupils on both sides, abnormal pupil color, abnormal pupil shape, slow response to light or disappearance, etc., it is necessary to be alert to whether there is a problem with physical health! 4. Good visual function and good vision Functions include visual acuity, binocular vision, contrast sensitivity, color vision, visual field, etc. (1) Vision: Does vision 1.0 mean that the eyes must be healthy? Not necessarily! Vision is only an important indicator for judging vision health, but it is not the only measure. That is, sometimes even though vision can reach 1.0, there may be other visual defects, and the eyes are still unhealthy. ▲ What kind of vision is considered a "standard"? The process is basically as follows:. 4-month-old infant's visual acuity is 0.02-0.04;. 5-6 month-old infant's visual acuity is 0.04-0.08;. 7-8-month-old infant has fixed vision and can look in one direction for a long time;. One year old Children can recognize the eyes, ears, nose and other organs;. The visual acuity of children aged 2 to 3 is 0.4 to 0.5; the visual acuity of children aged 3 to 4 is 0.5 to 0.7; the normal visual acuity of children aged 5 to 6 is close to 0.8 to 1.0; . After 6 years of age to reach 1.0 is the normal standard vision. (2) Binocular vision function When we are looking at things, the images formed by external objects in the corresponding parts of the retinas of both eyes are merged into one through the visual center of the brain, making people feel that they are not two separate objects, but a complete one. Stereoscopic image, this function is called binocular vision. Binocular vision is the basis of binocular vision. Only with normal binocular vision can we enjoy comfortable and long-lasting vision. (3) Contrast Sensitivity Contrast sensitivity is the ability of the human eye to see large blurred objects clearly. Not only to feel the light of an object, but also to distinguish it and recognize its shape. (4) Color vision Most people can distinguish various colors, which is called normal color vision, but some people cannot distinguish various colors, which is called color blindness. Red-green color blindness. Others experience a sudden or gradual loss of color vision, which may lead to underlying health problems, such as cataracts. Color blindness and color weakness test chart: First of all, you must be far away from the screen, so that the detected data is accurate; if you can only see the number 2, it is a color-weak crowd, and if you see two numbers, it proves that it is normal vision. (5) Field of view The field of view refers to the spatial range that the eyes can see when looking at the object directly in front of the person when the head and eyeballs are fixed. Usually driving, crossing the road, you need to use the peripheral vision to pay attention to the situation to ensure safety. Retinitis pigmentosa, advanced glaucoma, peripheral retinal choroiditis, optic disc edema, optic disc defect and other eye diseases can cause visual field defects. Tips: With good eye habits, it is everyone's pursuit to have sharp vision, a wide field of vision, and no eye disease and eye discomfort. But now people are looking at computer screens, looking at mobile phones or staying up late to work overtime all day, all of which can cause a lot of damage to the eyes. Here, doctors recommend that you develop the habit of regular eye examinations, and conduct detailed eye examinations at least once a year, especially for children and adolescents, people with high myopia, middle-aged and elderly people, diabetes, and hypertension.

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