Distance Between Ears Calculation

[skumarlabs]

OpenPose-to-Blender-Facial-Capture-Transfer/Facial JSON.py

Line 123 in e22bb27

self.distancBetweenEars = abs(GetPoint(pose, 18)[0] - GetPoint(pose, 18)[1])

I was just browsing through the code, the line mentioned above to get the distance between the ears.
self.distancBetweenEars = abs(GetPoint(pose, 18)[0] - GetPoint(pose, 18)[1])

I am not quite sure, how the above line gets the distance between two ears. The above line just calculates the distance between x and y location of left ear joint, if am not wrong.

Shouldn't it be something like where joint #17 is for right ear and #18 is for left ear and we are getting x location of both ears?
self.distancBetweenEars = abs(GetPoint(pose, 17)[0] - GetPoint(pose, 18)[0])