Once Indra"s son Jayandan,who was in the form of a crow,played pranks on SitaDevi.Sree Rama could not tolerate this.He got angry and sent his Brahmaastra to chase the crow.

The crow got frightend and flew to the threeworlds and also from one house to the other seeking help.No one could help him.At last he came back to Sreerama and postrated spreading his wings keeping his face side ways.Sitadevi straightened his face and thus he got rescued.

Sreerama seeing the gesture of Sitadevi doing good to those who harmed her took some consideration on that crow and  plucked one of his eye only instead of life.

Even today crow cannot see straight .It has to turn its head sideways to get vision of things.