Eye

An eye is a part of a living being's body that is used to receive visual sensory information that is interpreted by the brain.

At least in the 2011 Smurfs movie, Smurfs all have blue eyes. Their vision is considered to be in the same range as humans, though some can suffer conditions such as astigmatism, where things are blurry regardless of their actual distance from the Smurf, and light sensitivity. In the EMPATH: The Luckiest Smurf story series, Brainy, Narrator, and Orbit suffer from eye problems that require the use of glasses, though Narrator's eye problems aren't as severe as Brainy's or Orbit's.