很多人都有无偿献血的经历，对于这种公益性的行为很多人都会参与，然而高度近视的人千万要注意，献血的过程是一个损失血量的过程。
在损失血量的过程中，由于血容量的减少会导致血压产生波动，高度近视患者眼底的血管会被延长，眼轴拉伸会变得很细，受血压波动的影响，就会产生血管痉挛。
眼底血管痉挛的出现，会使收缩变薄的视网膜产生破裂或者导致玻璃体腔内的液体进入视网膜以下，引发神经上皮和色素分离也就是我们常听到的视网膜脱落，这样的话就会直接影响到我们的视力，甚至有失明的可能。
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