In 2007, researchers at the University of CaliforniaâDavis determined that our Solar System was fully formed at 4.568 billion years ago. They did this by determining the age of stony materials from the asteroid belt.
When to see a doctor. See your doctor immediately if you experience the signs and symptoms of migraine with aura, such as temporary vision loss or floating spots or zigzag lines in your field of vision. Your doctor will need to rule out more-serious conditions, such as a stroke or retinal tear.
The Causes of Tunnel Vision. Tunnel vision can be caused by a host of medical and biological conditions ranging from blood loss, alcohol consumption through to mercury poisoning and a bite from a black mamba (a type of poisonous snake). The leading causes of the condition are listed below: Glaucoma.