What does it mean when your eyes blackout for a few seconds?

When a blood vessel in your retina tightens, it causes a vasospasm. This cuts down on blood flow, which can bring on temporary vision loss in one eye. Various conditions can lead to a vasospasm. These include a retinal migraine, atherosclerosis, and high blood pressure.

Why does my vision fade to black?

A greyout is a transient loss of vision characterized by a perceived dimming of light and color, sometimes accompanied by a loss of peripheral vision. It is a precursor to fainting or a blackout and is caused by hypoxia (low brain oxygen level), often due to a loss of blood pressure.

What does it mean when everything goes black for a few seconds?

Orthostatic hypotension — also called postural hypotension — is a form of low blood pressure that happens when you stand up from sitting or lying down. Orthostatic hypotension can make you feel dizzy or lightheaded, and maybe even cause you to faint.

Is it normal for your vision to go black when you stand up?

So in addition to feeling “dizzy” from not enough blood flow, your vision might get dark, or it might seem like you’re looking through curtains or down a tunnel. After a few seconds, your heart will pump harder and more blood will make it up to your brain. That’s when the symptoms stop.