There is not agreement in the literature where DIR is located precisely. In cadavers without inguinal hernia, DIR is located between MILP & MIP (Wan WH1, Tan EL. (Surg Radiol Anat. 2011 Jan;33(1):59-63) . Since, an inguinal hernia usually alters the anatomy to some extent, we have to take into account the findings of that paper.

Totally agreed with you, Tarik.

Importance only during exams. Interestingly, a study to compare intraoperative findings with preoperative diagnosis only showed diagnostic accuracy of 82% among consultants and much lower for registrars and house officers. ( Sanjay P. et al,Clin. Anat. 23:848–850, 2010)

Thank you so much for your valuable answers! 

I totally agree with you :)

Deep ring is closer to the mid-inguinal point than the midpoint of the inguinal ligament

But again: Who cares?

The deep  ring is a hole in the transverse fascia, you can see it from abdominal cavity. And it is important only in that situation but you will see it with no doubt.

Thanks for the answers

 Midpoint of the inguinal ligament