why do many people with myopia have astigmatism? 3 minutes Abstract: medically speaking, myopia and astigmatism are manifestations of ametropia. In fact, it is very simple to distinguish myopia and astigmatism. Myopia is relatively clear when looking close, but it is not clear when looking far away, but astigmatism is to see the edge of the object is virtual, and serious astigmatism will even appear ghosting, which is difficult to see clearly regardless of the distance.
when we go to the optometry Center for examination after our eyesight decreases, the optometrist usually tells us two degrees, one is myopia and the other is astigmatism.
it seems that people with simple myopia are rare. Why do many people with myopia have astigmatism?
the relationship between astigmatism and myopia
medically speaking, myopia and astigmatism are the manifestations of ametropia. In fact, it is very simple to distinguish myopia and astigmatism. Myopia is relatively clear when looking close, but it is not clear when looking far away, but astigmatism is to see the edge of the object is virtual, and serious astigmatism will even appear ghosting, which is difficult to see clearly regardless of the distance.
astigmatism itself can develop into myopia, and the combined astigmatism in myopia can promote the occurrence and development of myopia.
what kind of experience is astigmatism in the eyes?
for people with astigmatism, there will be vision loss, visual distortion, monocular visual ghosting The vision at night is worse than that in the daytime (night blindness is different). When seeing objects, they like head and neck tilt, habitual squinting, visual fatigue and other symptoms. When checking the E-Sign of peers in the vision chart, they can recognize in one direction, but not in the vertical direction, and the visual performance is uneven.
For patients with high astigmatism, there are often only light or rare symptoms such as blurred vision, headache or visual fatigue. However, when high astigmatism is nearly fully corrected, these symptoms may occur, which is caused by the remaining uncorrected mild astigmatism.
in addition, they often narrow their eyes to reduce the degree of blurring of the object image, and move the object closer in order to obtain a larger retinal image.
causes astigmatism to deepen. The emergence of
astigmatism is related to congenital and acquired factors.
congenital astigmatism refers to the problem that some children will have astigmatism during embryonic development. At present, it is not clear what factors cause it in medicine. Therefore, congenital, it is difficult to prevent it.
in addition to congenital astigmatism, the emergence and development of other astigmatism types are almost inseparable from two points: squinting and rubbing eyes. This is because the vast majority of acquired astigmatism is uneven in the cornea, and frequent eye rubbing and squinting may lead to this situation in the cornea.
although there is no clinical experiment that eye rubbing and squinting will definitely cause astigmatism, they are somewhat related.
another point is that some nearsighted friends do not like to wear glasses. They are worried that the degree of nearsightedness will become deeper and deeper and will never be removed. Therefore, once it is blurred, it is easy to form the habit of squinting. In fact, this will accelerate the development of nearsightedness and lead to the deepening of astigmatism.
one thing, please pay attention!!!
if the astigmatism degree changes from 100 degrees to 200 degrees, 300 degrees or even higher, be careful of a special corneal disease keratoconus, which can cause blindness. Be sure to recheck the corneal topography regularly.