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.
A number of drugs can affect the nerve, but stopping them when symptoms occur usually improves or resolves the problem. Prolonged use of the antibiotic linezolid (ZYVOX) can produce optic nerve damage characterized by visual field defects, decreases in color vision and in vision more generally.