A Rotoscoped Animation of Rotary Nystagmus Due to BPPV

A few years ago when I made my claymation version of the Dix-Hallpike and Epley Maneuvers for BPPV, I also made a lame attempt to show an example of rotary nystagmus with a claymation eye but that didn't turn out so well and I forgot about it. I have now returned to the subject but with a new twist. I used some new animation software to create an animation of rotary nystagmus. I also threw in the claymation portion of the Dix-Hallpike video with a few modifications to parallel the test findings. It turned out even better than I expected it to. I used Toon Boom Studio 5 to rotoscopically animate a normal close-up video that I made of a face with one eye in the frame. Then I manipulated the eye layer of the drawing to simulate the rotational movements of the eye associated with BPPV. Here is the final product:

A Dizzy Diagnosis: Benign Paroxysmal Positional Vertigo

click to view video 

BPPV is a disorder of the inner ear which is a cause of vertigo in approximately 20% of patients who present to their doctor with this complaint. This occurs when otoconia are dislodged from their usual position within the utricle and they migrate over time into one of the semicircular canals (the posterior canal is most commonly affected due to its anatomical position). This Diagnosis can be made using the Dix-Hallpike Test and is frequently treated by use of the Epley Maneuvers.

In my practice, I make this diagnosis more often than many of my peers, mostly I think because I look for it. To me, it is about the only bright spot when dealing with the chief complaint of "dizziness". This is because treatment is so effective and no medicines are required. Patients have called back in a day or two just to tell me that it worked because they are so surprised. Honestly, when I first started doing it, I was surprised as well. It seems like most of the family practitioners that I talk to have heard of this simple procedure, but most of them never try it because for some reason it seems too magical or tricky. For that reason I have created this claymation video to serve as a visual aid for those who are interested. Keep in mind that this is not my specialty, this is not intended to replace a visit to your doctor if you experience vertigo, and you shouldn't try this if you don't have the training to know when you shouldn't do it. This is just a fun little video to give you very basic idea of how it is done. I will gladly accept any criticism of the technique, but don't expect me to change the video because the patient has been thrown out. Enjoy.

Claymation Eye Movement

7 sec., 1.5 Mb, QuickTime

This video was made during the same session as the Dix-Hallpike and Epley Maneuver video was made. I was going to try to demonstrate Rotary (torsional) nystagmus which becomes apparent with a positive Dix-Hallpike test. However the clay was too soft and the toothpicks in the back of the eye kept moving around instead of the eye moving properly, so I just did the best I could at making the eye look around and look as real as possible.