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.
Trauma. A dilated pupil may be caused by any kind of trauma such as a damage of the nerves controlling the activities of the iris, an injury to the head or the eye, and iris sphincter. All these factors highly affect the consensual reactivity of the eyes to light and cause fixed and dilated pupils after trauma.ervous Problems. The neuropathic cause behind dilation of the pupils is the sympathetic stimulation of Î±1 adrenergic receptors involving the radial muscle and the parasympathetic stimulation involving the circular iris muscle cause the pupils to dilate.