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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: Vision Res. 2015 Feb 9;118:98–104. doi: 10.1016/j.visres.2015.01.019

Figure 6.

Figure 6

Vertical eye traces from subject 1. This subject exhibits an upbeating vertical nystagmus with amplitude of about 5 arc minutes and frequency of about 1 beat per second. Two of the five individuals we imaged in the development of this instrument have a small vertical nystagmus, and neither knew it was there until eye tracking revealed it. In our experience around 1 of 10 individuals shows this pattern without noticeable visual consequence. The difference trace (green) shows very little of the nystagmus, indicating that it is almost completely conjugate. Each vertical saccade shows a distinct overshoot that is itself about 4 arc minutes. These are most likely due to image shifts caused by crystalline lens wobble associated with the saccades (He, et al. 2010).