Abstract: the proportion of pseudomyopia in juvenile myopia is about 2.4%, which means that the eyeball presents myopia under adjustment, but the refractive state is within ± 0.50ds during pupil dilation optometry., This is a problem often encountered in clinical work. Many parents believe that children with low degree are pseudomyopia and do not need to wear glasses. In fact, there are some misunderstandings. Some patients with low degree may be pseudomyopia, but many are true myopia., The proportion of pseudomyopia in juvenile myopia is about 2.4%, which means that the eyeball presents myopia under adjustment, but the refractive state is & plusmn during pupil dilation optometry; Within 0.50ds. As for the causes of myopia, some children initially showed pseudomyopia and finally developed into true myopia because of the disorder of regulation function., Why does pseudomyopia occur?, Our eyes are like a precision camera. The two main components are the lens and the negative. When a normal person looks far away (5m away), the whole eye is in a relaxed state, that is, do not adjust. Distant objects can finally converge on the negative (macular fovea of the retina) through the refraction of the lens, so that we can see distant objects clearly; When we look close (within 5m), the lens needs greater bending force to make the object image on the negative film, which requires ciliary muscle contraction. Use the adjustment function to increase the bending force of the lens. The closer we look at the object, the greater the adjustment force. When we look far, we need to reduce the adjustment force and relax the ciliary muscle. If we look close for a long time, the ciliary muscle will contract for a long time, which will produce spasm. When we look far again, the ciliary muscle cannot relax, so we can’t see distant objects. At this time, the eyes are in a state of myopia. This state is only a temporary state in the early stage. This myopia can be reversed through rest, looking far and appropriate drugs., To distinguish between pseudomyopia and true myopia, mydriasis drugs must be used. The main purpose of mydriasis is actually to paralyze the ciliary muscle and make the ciliary muscle fully relax, so as to eliminate pseudomyopia caused by ciliary muscle spasm. If there is myopia of more than 50 degrees after optometry after full mydriasis, this is true myopia. Glasses may be needed according to the specific situation., For example, the refraction under the small pupil is 200 degrees myopia. If the degree after pupil dilation refraction is ± 0.50ds, it is pseudomyopia; If the degree after pupil dilation optometry is -1.00ds, there will be 100 vacation myopia and 100 true myopia; If it is -2.00ds after mydriasis optometry, these 200 degrees are true myopia.,
is a common problem in clinical work. Many parents believe that children with low degree are pseudomyopia and do not need to wear glasses. In fact, there are some misunderstandings. Some patients with low degree may be pseudomyopia, but many are true myopia. The proportion of
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pseudomyopia in juvenile myopia is about 2.4%. It means that the eyeball shows myopia under adjustment, but the refractive state is & plusmn during pupil dilation optometry; Within 0.50ds. As for the causes of myopia, some children initially showed pseudomyopia and finally developed into true myopia because of regulatory dysfunction. Why does
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have pseudomyopia?
our eyes are like a precision camera. The two main components are the lens and the negative. When a normal person looks far away (5m away), the whole eye is in a relaxed state, that is, do not adjust. Distant objects can finally converge on the negative through the refraction of the lens (retinal macular fovea), So that we can see the distant objects clearly; When we look close (within 5m), the lens needs greater bending force to make the object image on the negative film, which requires ciliary muscle contraction. Use the adjustment function to increase the bending force of the lens. The closer we look at the object, the greater the adjustment force. When we look far, we need to reduce the adjustment force and relax the ciliary muscle. If we look close for a long time, the ciliary muscle will contract for a long time, which will produce spasm. When we look far again, the ciliary muscle cannot relax, so we can’t see distant objects. At this time, the eyes are in a state of myopia. This state is only a temporary state in the early stage. This myopia can be reversed through rest, looking far and appropriate drugs.
to distinguish between pseudomyopia and true myopia, mydriasis drugs must be used. The main purpose of mydriasis is actually to paralyze the ciliary muscle and make the ciliary muscle fully relaxed, so as to eliminate pseudomyopia caused by ciliary muscle spasm. If there is myopia of more than 50 degrees after full mydriasis, this is true myopia, Glasses may be required depending on the circumstances.
and
for example, the refraction under the small pupil is 200 degrees myopia. If the degree after pupil dilation refraction is ± 0.50ds, it is pseudomyopia; If the degree after pupil dilation optometry is -1.00ds, there will be 100 vacation myopia and 100 true myopia; If it is -2.00ds after mydriasis optometry, these 200 degrees are true myopia.