Hello. On circumstances it is necessary to be often headfirst....

[Michael]

Hello. On circumstances it is necessary to be often headfirst. In such position the strain of eyes is felt (or a rush of blood), they become covered by a grid of veins. Vessels did not burst, whether but vse-taki it would be desirable to learn or find out harmfully it for eyes?

[Zhidkova T.V.]

If you are healthy, are not present.