Blood donation also has requirements for the degree of myopia in the eyes, and it is generally considered that patients with more than 800 degrees of myopia are not recommended to participate in blood donation. The reason for this decision is mainly because high myopia can cause changes in the eye axis, which can lead to highly myopic fundus pathologies, such as retinal pigment disorders, optic disc atrophy arc, macular clefting, macular hemorrhage, and in severe cases, retinal fissures or retinal detachment. During blood donation, the blood pressure fluctuates significantly within a short period of time, so it increases the risk of retinal detachment or retinal fissure, which are serious complications. That is why it is recommended that highly myopic patients, especially those with more than 800 degrees of myopia, should not participate in blood donation as much as possible. Of course, it is not completely absolute, as long as there are no problems with the fundus of the eye, you can also participate.