Mangekyou Sharingan is the evolved form of Sharingan. One is able to awaken Mangekyou Sharingan when he/she suffers incredible amount of trauma. Like when shisui awakened it he saw his friends die, Sasuke Uchiha awakened it when he killed his brother. But first one should have awakened the normal Sharingan. Different Mangekyou Sharingan users have their own different Mangekyou Sharingan ability and no two characters have the same Mangekyou Sharingan ability.
So, there is a theory that why different Mangekyou Sharingan users have different visual prowesses. Let us start with observing Obito Uchiha’s visual prowess, Kamui. His left eye has long ranged Kamui and right eye has short ranged Kamui. It does make sense as eyes work together to perceive depth. But the question that I had was why Obito Uchiha had Kamui in the first place.