The eye is filled with a jelly-like substance called vitreous gel. With age, this gel becomes increasingly more liquid-like in nature, causing small particles, called floaters, to become visually evident. Flashes originate from the tugging on the retina as the vitreous gel liquefies. This process is normal; however, significant flashes and floaters may indicate a more serious retinal condition, calling for prompt medical attention.  For more information click here.