title: Assessment of retinal image displacement during head movement using an afterimage method.
abstract: An afterimage method has been used to measure retinal image displacement during binocular fixation with active head rotation about a vertical axis. The results confirm previously published reports that fixation accuracy in the horizontal direction deteriorates as a result of a head rotation. However, both retinal image displacements and fixation disparities were found to remain much smaller (by a factor of 3 and 8 respectively) than the values previously reported in the literature for similar head rotations (peak-to-peak amplitude: 20 degrees, frequency: 0.66 Hz). Moreover, our results show that fixation accuracy fell not only in the horizontal direction, but also in the vertical direction by about the same factor. It is concluded that eye-movement compensation of active head rotation may be much better than previously reported in the literature, and good enough to prevent deterioration of vision.
mesh_terms: D000360:Afterimage / Q000502:physiology*; D005133:Eye Movements; D005403:Fixation, Ocular; D006257:Head / Q000502:physiology*; D006801:Humans; D008297:Male; D009068:Movement; D014796:Visual Perception / Q000502:physiology