Abstract: myopia is divided into mild, moderate and high according to the degree. The degree less than 300 degrees is mild myopia, the degree between 300 and 600 degrees is moderate myopia, and the degree greater than 600 degrees is high myopia. High myopia is mainly caused by the lengthening of the ocular axis. For every 1mm lengthening of the ocular axis, the degree increases by 300 degrees.
with the development of society and the progress of the network, myopia patients can be found everywhere. The degree of myopia will deepen with age, even up to more than 2000 degrees. Severe high myopia will lead to a variety of pathological changes in the fundus, which is very harmful to patients and must not be ignored.
what is high myopia??
myopia is divided into mild, moderate and high according to the degree. The degree less than 300 degrees is mild myopia, the degree between 300 and 600 degrees is moderate myopia, and the degree greater than 600 degrees is high myopia. High myopia is mainly caused by the lengthening of the ocular axis. For every 1mm lengthening of the ocular axis, the degree increases by 300 degrees. How much can the myopia degree reach? Up to 4800 degrees!
what eye diseases can high myopia cause?
high myopia can cause many complications. The abnormal structure of “anterior chamber angle” in patients with high myopia leads to large outflow resistance of aqueous humor, elevated intraocular pressure and glaucoma; The lens of patients with high myopia can not support the iris, resulting in “iris tremor”. The metabolism of aqueous humor in patients with high myopia is abnormal, which changes the permeability of the lens, resulting in nutritional disorders, nuclear opacity and posterior capsule opacity of the lens, resulting in cataract; The liquefaction of vitreous reticular colloidal structure in patients with high myopia leads to vitreous opacity. More importantly, high myopia can also cause fundus lesions. What are the fundus lesions caused by
the most characteristic changes in the fundus of high myopia (including some moderate myopia) are “leopard shaped fundus” and “myopia arc”. They do not affect vision and do no damage to the eyes.
The eyeball of high myopia becomes longer, which makes the retina and choroid atrophy. The peripheral part of the retina is very prone to degeneration and form holes. In addition, the liquefied vitreous enters under the retina, resulting in retinal detachment. The eyeball of high myopia becomes longer, which can also pull the small choroidal vessels in the macula and cause rupture, resulting in macular hemorrhage. Patients with
high myopia can develop posterior scleral staphyloma, which is characterized by backward expansion of the posterior pole of the eyeball, degeneration and atrophy of the optic nerve and the retina around the macula. The shape of staphyloma is cone, square, wedge or arc. The higher the degree of myopia, the higher the incidence of posterior scleral staphyloma.
myopia is not good for nothing.
it is not until the middle-aged and elderly that they realize that myopia also has advantages. Myopic people suffer from presbyopia several years later than ordinary people. If myopic people can’t see nearby objects clearly, they can take off their glasses and see clearly with their bare eyes. Others don’t have such convenience. They either need to put nearby things far away or wear reading glasses.
due to the offsetting effect of myopia, the degree of reading glasses worn by people with myopia is also lower than that of ordinary people. People with high myopia only need to wear low degree myopia glasses as presbyopic glasses, or sacrifice part of their far vision and appropriately lower the degree of glasses, so as to achieve the purpose of seeing both near and far with one glasses. Diabetic retinopathy is rare in diabetic patients with
high myopia. This is because the atrophy of retina and choroid caused by high myopia reduces the metabolic demand of retina, increases the oxygen circulation of retina and reduces the risk of sugar net.
high myopia should pay attention to fundus lesions. Fundus lesions in patients with
high myopia can affect vision and make the best correction of far and near vision impossible. Macular lesions are the main cause. In addition to bleeding, there will also be “lacquer crack pattern lesions” and “Fuchs spots”, Both are also characteristic lesions of high myopia (including some moderate myopia). The most serious is that patients with high myopia are very prone to retinal detachment. If they are not treated in time, they can eventually cause blindness.
For patients with high myopia, because the retina is very fragile, do not exercise violently, and pay special attention to avoid severe head concussion and impact, so as to reduce the possibility of retinal detachment. Once there is a flash feeling in the eyes, or there is a fixed shadow covering in front of your eyes, you should go to the hospital to see an ophthalmologist as soon as possible.
patients with high myopia cannot donate blood, because the eyeball becomes longer and the blood vessels become more slender. The slight fluctuation of blood pressure during blood donation may cause fundus vasospasm, resulting in retinal holes and retinal detachment. Patients with
high myopia should check the fundus once a year, find the fundus lesions as soon as possible, and take positive measures to prevent blindness caused by serious fundus lesions.