Abstract: the main symptom of myopia is the loss of long-distance vision. It can not distinguish distant targets clearly, but it can still see close targets clearly. Therefore, as long as through the visual acuity examination, it is found that the far vision can not reach 1.0, while the near vision is still normal. Those who reach 1.0 are myopia., How to find and identify myopia patients in normal people? Some people say, “it’s very simple. The eyes that look very close to things are myopia.”. Some people also say, “the eyes that should be narrowed when looking at things are myopia”. And so on. We also see that some schools list students whose far vision is less than the normal standard as myopia patients in the prevention and treatment of myopia. It seems that none of them can grasp the diagnostic criteria of myopia., The main symptom of myopia is the loss of long-distance vision. It can’t distinguish distant targets clearly, but it can still see close targets clearly. Therefore, as long as through the visual acuity examination, it is found that the far vision can not reach 1.0, while the near vision is still normal. Those who reach 1.0 are myopia. In this way, the diagnosis of myopia is relatively easy, but this is only for simple myopia. For patients with pathological myopia, due to eye diseases, especially macular degeneration and atrophy, near vision can not reach normal. At this time, we can only make a diagnosis from the typical myopia manifestations of the fundus through ophthalmoscopy, and then make a diagnosis through optometry., The general rule is that the higher the number of myopia, the worse the far vision. But we often see many myopic patients ask, “why is my myopic suit only 200 degrees and his eyesight only 0.02; his near sighted eye is 1000 degrees, but his eyesight is 0.2, which is better than me?” To answer this question, we must consider two aspects. First of all, when checking with the far vision chart, the eyes should be kept in a natural state, rather than narrowing up to see things. Only in this way can the far vision be more correct. Many people with myopia tend to squint at things, which can concentrate the light entering the eyes and appropriately change the state of the eyeball, so as to make the image cast on the retinal spots clearer. If the patient with high myopia squints when checking with the far vision chart, and the patient with low myopia does not squint, it is likely that the far vision test result of high myopia is better than that of low myopia. Secondly, if patients with high myopia have never worn corrective glasses, it has become a habit to judge far blurred images in daily life. They can roughly distinguish the images according to the outline of blurred images, while patients with low myopia generally wear corrective myopia glasses. When he takes off his glasses for naked vision examination, There seems to be a big gap between the clear image seen when wearing the lens and the fuzzy group seen during the examination, so it can’t adapt to the discrimination of long-distance fuzzy images for the moment. At this time, the far vision detected is also completely possible, but it is not as good as the high myopia patients who have never worn corrective glasses. This is only to illustrate the fact that when the visual acuity is lower than normal, the quality of naked far vision can not be used as the standard for the diagnosis of myopia, because it can not fully reflect the real situation of visual function., Myopic patients like to squint at objects, and often put their face close to objects. What’s the reason? When light 5 meters away from the eyeball (which can be regarded as parallel light) enters the eyeball of myopia, the light can only intersect in front of the retina, and only a diffusion circle can be formed on the retina. On the contrary, myopia has high adaptability to the divergent light from nearby targets. There is a focus of light on the retina of myopia. If you start from this focal point and draw outside the eye in the opposite direction of the above light focusing process, you can see that the light emitted from the retinal focal point is bound to form another focal point outside the eye., How can
find and identify myopia patients in normal people? Some people say, “it’s very simple. The eyes that look very close to things are myopia.”. Some people also say, “the eyes that should be narrowed when looking at things are myopia”. And so on. We also see that some schools list students whose far vision is less than the normal standard as myopia patients in the prevention and treatment of myopia. It seems that none of them can grasp the diagnostic criteria of myopia. The main symptoms of
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myopia are the loss of long-distance vision and the inability to distinguish distant targets, but they can still see close targets. Therefore, as long as through the visual acuity examination, it is found that the far vision can not reach 1.0, while the near vision is still normal. Those who reach 1.0 are myopia. In this way, the diagnosis of myopia is relatively easy, but this is only for simple myopia. For patients with pathological myopia, due to eye diseases, especially macular degeneration and atrophy, near vision can not reach normal. At this time, it can only be diagnosed from the typical myopia manifestations of the fundus through ophthalmoscopy, and then confirmed by optometry. The general rule of
and
is that the higher the number of myopia matches, the worse the far vision. But we often see many myopic patients ask, “why is my myopic suit only 200 degrees and his eyesight only 0.02; his near sighted eye is 1000 degrees, but his eyesight is 0.2, which is better than me?” To answer this question, we must consider two aspects. First of all, when checking with the far vision chart, the eyes should be kept in a natural state, rather than narrowing up to see things. Only in this way can the far vision be more correct. Many people with myopia tend to squint at things, which can concentrate the light entering the eyes and appropriately change the state of the eyeball, so as to make the image cast on the retinal spots clearer. If the patient with high myopia squints when checking with the far vision chart, and the patient with low myopia does not squint, it is likely that the far vision test result of high myopia is better than that of low myopia. Secondly, if patients with high myopia have never worn corrective glasses, it has become a habit to judge far blurred images in daily life. They can roughly distinguish the images according to the outline of blurred images, while patients with low myopia generally wear corrective myopia glasses. When he takes off his glasses for naked vision examination, There seems to be a big gap between the clear image seen when wearing the lens and the fuzzy group seen during the examination, so it can’t adapt to the discrimination of long-distance fuzzy images for the moment. At this time, the far vision detected is also completely possible, but it is not as good as the high myopia patients who have never worn corrective glasses. These are described only to illustrate thisWhat kind of fact: when the vision is lower than normal, the quality of naked far vision can not be used as the standard for the diagnosis of myopia, because it can not fully reflect the real situation of visual function.
myopic patients like to squint at things, and often put their face close to objects. What’s the reason? When light 5 meters away from the eyeball (which can be regarded as parallel light) enters the eyeball of myopia, the light can only intersect in front of the retina, and only a diffusion circle can be formed on the retina. On the contrary, myopia has high adaptability to the divergent light from nearby targets. There is a focus of light on the retina of myopia. If you start from this focal point and draw outside the eye in the opposite direction of the above light focusing process, you can see that the light emitted from the retinal focal point is bound to form another focal point outside the eye.