Abstract: for people with high myopia, due to the continuous traction of the eyeball wall caused by the enlargement of the eyeball, it will cause the metabolic imbalance in the normal relationship between the fundus retina and choroid tissue, especially when the small blood vessels in the macular area are broken due to traction and other factors, it will cause macular hemorrhage and greatly damage the central vision. Why can’t
high myopia donate blood? Why can’t
high myopia donate blood? Not allowing patients with high myopia to donate blood is for their own good, but many people feel very strange. In fact, this is right. If patients with high myopia donate blood, it will increase the burden on their eyes.
for people with deep myopia (more than 500 degrees), blood stations generally do not advocate blood donation, and those with mild myopia and healthy body can donate blood. High myopia can not donate blood, mainly because it will affect the fundus blood vessels. Myopia is a refractive abnormality of the eye. Generally speaking, there are few complications in mild myopia (less than 300 degrees), while in high myopia (more than 500 degrees), the anterior posterior diameter of the eye becomes significantly longer, but the retina and choroid cannot grow accordingly, resulting in the elongation and diffuse atrophy of the retina and choroid, and the corresponding blood vessels become more slender, In this way, blood vessels are very sensitive to changes in blood pressure, and the vitreous body can change from colloidal to liquid. The blood pressure will fluctuate slightly during blood donation of
. For those with high myopia whose fundus blood vessels are pulled thin, the slight blood pressure fluctuation may cause fundus vasospasm, resulting in a hole in the diseased retina. At this time, the liquefied vitreous body will take the opportunity to enter under the retina, causing retinal detachment and seriously affecting vision. Therefore, from the perspective of protecting blood donors, people with high myopia should not donate blood. Experts from
said that myopia blood donors are not uncommon in daily life. Because the degree of high myopia is not clearly specified in China’s blood donation standards, considering astigmatism and other factors, in general practice, it is usually based on about 500 degrees to patiently persuade high myopia blood donors.
complications that may occur in patients with high myopia
in addition to the above dangerous situations, there are these terrible complications in patients with high myopia.
flying mosquito disease
people with this disease often have dark shadows floating in front of their eyes with the rotation of their eyes, just like mosquitoes and flies flying, which is due to the liquefaction of the normal colloidal structure of the vitreous body.
people with high myopia will cause metabolic disorders in the normal relationship between fundus retina and choroid tissue due to the continuous traction of the eyeball wall due to the enlargement of the eyeball, especially when the small blood vessels in the macular area rupture due to traction and other factors, it will cause macular hemorrhage and greatly damage the central vision. At this time, the patient realized that there was a fixed shadow blocking his line of sight. Although the bleeding can be absorbed after treatment, it will always leave blood marks more or less, affecting vision.
is a serious complication with complex causes. From the internal cause, the retinal tissue of patients with high myopia becomes fragile due to degeneration and atrophy, which is very easy to make retinal detachment and blindness. The external cause is mainly the sudden impact of external force, which promotes retinal rupture through vitreous conduction, resulting in retinal detachment and blindness.