Range Of Sight - DotA-Allstars Guide

While playing DotA, many of you must have cursed yourself for letting that enemy escape with 10hp. Why? Just because that hero got out of your sight. What is this sight actually? The term Range of Sight, or Sight Range, is used to describe how far a hero will see on day/night without taking the terrain modifications into account. Allied units share vision around the map. You share sight with