Fixation disparity with a so-called "central" fusion lock.
Kommerell
Guntram
G
D005403:Fixation, Ocular / Q000502:physiology*; D006801:Humans; D015357:Vision Disparity / Q000502:physiology*; D014787:Vision Tests / Q000379:methods; D015348:Vision, Binocular / Q000502:physiology