Rotation Vector Analysis of Eye Movement in Three Dimensions with an Infrared CCD Camera
1999; Taylor & Francis; Volume: 119; Issue: 1 Linguagem: Inglês
10.1080/00016489950181882
ISSN1651-2251
AutoresT Imai, Noriaki Takeda, Masahiro Morita, Izumi Koizuka, Takeshi Kubo, Kiyoshi Miura, Koji Nakamae, Hiromu Fujioka,
Tópico(s)Glaucoma and retinal disorders
ResumoWe have developed a new technique for analyzing the rotation vector of eye movement in three dimensions with an infrared CCD camera based on the following four assumptions; i) the eye rotates on a point; ii) the pupil edge is a circle; iii) the distance from the center of eye rotation to pupil circle remains unchanged despite the rotation; iv) the image of the eye by the CCD camera is projected onto a plane which is perpendicular to the camera axis. After taking digital images of voluntary circular eye movements, we first constructed a three-dimensional frame of reference fixed on the orbita of the subject wearing a goggle equipped with an infrared CCD camera, and determined the space coordinates of the center of eye rotation, the center of the pupil, and an iris freckle. We then took digital images of the eye movements during a saccade or vestibulo-ocular reflex (VOR) and analyzed the axis and angle of the eye movements by the trajectories of the center of the pupil and the iris freckle. Finally, Listing's plane of saccade and the gain and the phase of VOR were obtained. The suitability of this technique is examined.
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