Is it normal for those with postural hypotension to go blind for a few seconds after standing up?

Is it normal for those with postural hypotension to go blind for a few seconds after standing up?
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How long do you go blind? Can’t you wait 30 seconds until your blood starts flowing normally? And it may be also because you are. Waking in a dark room. When I occasionally get up and am dizzy from low blood pressure, I don’t go “blind” but I do see stars and flashes for a few seconds.
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