Abstract: some concepts are simply put forward. Including: true myopia (HA HA), pseudomyopia, diopter, degree of wearing glasses, naked eye vision. As for the related astigmatism, strabismus, amblyopia, hyperopia, etc., it also has a great impact on vision. I’m not a technical expert, but myopia has been 25 years. Although it’s nothing compared with experts and professors in the industry, I’d like to share some experiences with you. I hope my friends will take fewer detours Simply put forward some concepts. Including: true myopia (HA HA), pseudomyopia, diopter, degree of wearing glasses, naked eye vision. As for astigmatism, strabismus, amblyopia, hyperopia, etc., it also has a great impact on vision. To add a little knowledge, when our eyes look far, the ciliary muscle is very relaxed. When we look close, the ciliary muscle needs to work hard. When we use our eyes close for a long time, Can cause ciliary muscle fatigue (any muscle will be tired if it is used too much). If it is tired, paralyzed or convulsed, it can’t relax anyway. At this time, when you look back and look far, you can’t see clearly. However, we should pay attention to the first concept: pseudomyopia is coming, and the vision loss caused by ciliary muscle fatigue is temporary. Through simple training, enough rest, or even directly With the product, the ciliary muscles can be relaxed again and can look far again., So what is true myopia?, Academically, it is also called axial myopia. As the name suggests, the eye axis becomes longer, (even if the ciliary muscle is very relaxed) it causes the focus to fall in front of the retina. Why does the eye axis become longer? Generally speaking, when the ciliary muscle is tired, you still maintain high-intensity eye use, resulting in eyeball exertion, pressurization and even congestion to adjust the position of the retina. Finally, the retina moves backward and the eye axis elongates. This is like excessive fitness and you don’t stop after muscle strain Come down, that’s a fracture. It should be noted that at present, science believes that the elongation of eye axis is irreversible!! (I don’t know whether I can have surgery or change my eyeball in the future). The calculation of true myopia is based on the degree of eye axis elongation. I can’t give a formula for the specific calculation method. Generally speaking, if it increases by 1mm, it will increase by 300 diopters. Seeing here, you may think I’m here to attack you. Don’t worry, look down. The concept is not finished yet!,
is not a technical expert, but it has been nearsighted for 25 years. Although it is nothing compared with experts and professors in the industry, it has some experience that I am willing to share with you. I hope friends will avoid detours.
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simply put forward some concepts. Including: true myopia (HA HA), false myopia, diopter, degree of wearing glasses, naked eye vision. As for the related astigmatism, strabismus, amblyopia, hyperopia, etc., it also has a great impact on vision.
add a little knowledge. When our eyes look far, the ciliary muscle is very loose. When we look close, the ciliary muscle needs to work hard.
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use your eyes closely for a long time, It will lead to ciliary muscle fatigue (any muscle will be tired if it is used too much), fatigue, paralysis and spasm. Anyway, it can’t relax. At this time, when you look back and look far, you can’t see clearly.
But we should note that the first concept of pseudomyopia is coming. The vision loss caused by ciliary muscle fatigue is temporary. Through simple training, enough rest, and even direct use of the product, you can relax your ciliary muscles and look far again.
so what is true myopia?
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are also called axial myopia. As the name suggests, the eye axis becomes longer, (even if the ciliary muscle is very relaxed) it causes the focus to fall in front of the retina. Why does the eye axis become longer? Generally speaking, when the ciliary muscle is tired, you still maintain high-intensity eye use, resulting in eyeball exertion, pressurization and even congestion to adjust the position of the retina. Finally, the retina moves backward and the eye axis elongates. This is like excessive fitness and you don’t stop after muscle strain Come down, that’s a fracture. It should be noted that at present, science believes that the elongation of eye axis is irreversible!! (I don’t know if I can have surgery or change the eyeball in the future.) true myopia is calculated according to the degree of eye axis elongation. I can’t give a formula for the specific calculation method. Generally speaking, an increase of 1mm will increase the diopter by 300.
See here, you may think I’m here to attack you. Don’t worry, look down. The concept is not finished yet! The concept of diopter is mentioned in
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. Never equate with the degree of wearing glasses and naked eye vision! There are great differences between them.
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diopters, in short, the diopters that need to be adjusted through the lens when the ciliary muscle does not work. Usually in the hospital, All measurements should be made after mydriasis (the ciliary muscle is completely relaxed with liquid medicine, so that it is not hard). It can also be measured directly through the optical optometer, because its principle is measured through the eye axis and is not disturbed by the ciliary muscle. Many parents may choose to use a variety of methods. In short, the key point we should pay attention to is – the ciliary muscle is not involved!
So what is naked eye vision? In life, we usually refer to it through an eye chart, That is, 0.6, 0.8 (I use this more often), or 5.0 or 5.2. The key point to note is that the ciliary muscle participates in this measurement process! As mentioned above, the ciliary muscle participates by pulling the lens. If the lens is thinned, the focus will fall back and just fall on the backward retina. That is to say, you have a diopter of 300 degrees, which may be no problem. You can pass through the eyelashes When the musculus tereiformis is pulled back, it can be washed away, so as to achieve normal naked eye vision.
therefore, a simple relationship: diopter + ciliary muscle regulation = naked eye vision. It’s just a relationship. Don’t calculate directly. The units are different.
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at this time, let’s look at the degree of wearing glasses. This is a very easy concept to make mistakes, and insiders often make mistakes. (there are two kinds of optometry in the industry: inserting film and instrument. I believe everyone has tried. In the process of inserting film optometry, the ciliary muscle plays a role, so the naked eye vision is tested, and the instrument is usually direct