Eli5: what causes loss of vision after sudden heavy bloodloss?

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Hello, so yesterday I suffered a headwound and it just gushed blood for 30 seconds or so until I could stop the bleeding and after I stopped it there were a few seconds where I couldn’t see anything, just like dots of light and black darting all over and then it went away and I could see normally again. Similar to static on an old TV I suppose.
What causes this?

In: Biology

2 Answers

Anonymous 0 Comments

Your eyes grow out of the same set of cells that eventually form the brain. Like the brain, the eyes require a great deal of blood to function

Changes in blood pressure can cause vision loss or misfires in the light sensitive cells, making you see stars until blood pressure is restored.

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