Neuron Structure. Your brain is made of approximately 100 billion nerve cells, called neurons. Neurons have the amazing ability to gather and transmit electrochemical signals -- think of them like the gates and wires in a computer.
Most doctors will only consider chronically low blood pressure as dangerous if it causes noticeable signs and symptoms, such as: 1  Dizziness or lightheadedness. 2  Nausea. 3  Fainting (syncope)  Dehydration and unusual 1  thirst. Dehydration can sometimes cause blood pressure to drop.  Lack of 1  concentration. Blurred vision.  Cold, clammy, pale skin.
When the eye pressure is lower than the eye can tolerate it is like a ball that is low on air where part of the ball can begin to collapse. For some individuals that can begin to happen with an eye pressure of even 10 mm Hg, while someone else may be perfectly fine without visual symptoms with a pressure of 2 mm Hg.