How far can Legolas really see in The Lord of the Rings? [video]

In The Lord of the Rings the elf Legolas has the ability to see great distances because of the fact that he is an elf. But could Legolas really see that far? Watch this in depth video break down the ability of sight to find out the real answer. (Of course this could all be proven wrong  if light travels differently in Middle-Earth compared to our Earth.)
WARNING - SCIENCE AHEAD!



Source: YouTube - MinutePhysics