Source: Chapter 385, Mangashare/Binktopia scanlation
We have seen Madara, Itachi and Sasuke, all wielders of the Mangekyo Sharingan, use Susanoo. All three have gone blind or have worsened eyesight at some point*. Itachi and Sasuke have also been shown using Amaterasu which makes the eyes bleed afterwards.
Danzo Shimura, Obito Uchiha and Kakashi Hatake, also wielders of the Mangekyo Sharingan, on the other hand, have never used any of the above techniques and have never shown any sign of blindness*. Why didn't they go blind or have worsened eyesight?
What causes the blindness effect of the Mangekyo Sharingan? How does the Mangekyo Sharingan eventually blind its wielder?
*Please correct me (or suggest an edit) if I'm wrong.
Also, please feel free to suggest edits adding what chapters the events mentioned above happened, so question answerers can review it.