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 lens of the eye focuses light onto the retina, which transmits visual signals through the optic nerve to the brain. Clouding of the lens due to cataracts results in blurring of the images you see. Other problems with the eyes can also cause blurry vision, but cataracts produce some characteristic symptoms.