Blood donation is a manifestation cheap oakley sunglasses of loving devotion, is selfless, noble life-saving act. Many caring people are willing to sacrifice their love. But their love, we still have to understand the blood donation knowledge. Shanghai Hospital of Shanghai Shen Wuguan Yan, director of health experts have warned that life for patients with high myopia, there is little need to know, should not donate blood in patients with high myopia. What is myopia? Experts say, is a high degree of myopia is myopia greater than 600 degrees, accompanied by axial extension, retinal and choroidal atrophy and other degenerative diseases as the main features of the ametropia. Is closely related to high myopia and genetic cheap oakleys, there will be many complications. Why should not donate blood in patients with high myopia? Experts, blood for blood is little effect on the normal eye, but eye refractive errors are myopia, in general, mild myopia, is less than 300 degrees, complications will be very limited.

The high degree of myopia is greater than 600 degrees, the anteroposterior diameter was significantly longer, but the retina and choroid but not the corresponding variable length, leading to the retina, is elongated and diffuse choroidal atrophy, and the corresponding blood vessels become more slim. This vessel is very sensitive to changes in blood pressure, while the vitreous gel can be turned into liquid. Slight fake oakley sunglasses fluctuations in blood pressure when blood, pulled too thin for retinal vascular high myopia, may cause retinal vascular spasm, leading to lesions of the retina has emerged hole, this time it will take the opportunity to enter the liquefied vitreous under the retina, resulting in retinal detachment, seriously affecting vision. Experts advise that patients with high myopia but also to avoid strenuous exercise, such as diving, bungee jumping and so on. In addition to the daily recommended addition to the ordinary eye, high myopia should not look too small to see fine words and long articles.