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Hotta, Katsuyoshi*; Prima, O. D. A.*; Imabuchi, Takashi; Kameda, Masashi*
The Journal of the Institute of Image Electronics Engineers of Japan, 50(3), p.392 - 401, 2021/07
A Visual field defect (VFD) is a loss of part of normal field of vision, resulting in vision distortion or sensation of seeing through a narrow tube. VFD is difficult to recognize by most patients because of the filling-in mechanism in the human brain. Widely used perimeters such as Goldmann and Humphrey have serious technical limitations on the subjectivity of visual field and vision acuity assessment. In contrast, the active perimeter automatically assesses VFDs by analyzing the involuntary eye movement characteristics when searching for visual stimuli presented on the screen. However, this perimeter has issues such as patients with VFDs encounter problems on performing the eye-gaze calibration, visual field assessment covers up to 60 degrees, and physical burden due to head fixation during the testing. This study proposes a high-performance active perimeter based on a high-speed eye tracking system in a Head-Mounted Display (HMD). The proposed perimeter has several features such as not requiring fixation of the head, testing up to 90 degrees Field-of-View (FoV), accurate pupil extraction, one-point gaze calibration, and visibility judgment by saccade latency and saccade count. A successful visual field testing has been conducted by 10 visually healthy subjects to recognize 76 visual stimuli randomly presented within 90 degrees FoV. Each testing was completed in about 14 minutes per subject, confirming that it significantly reduces the physical burden on the subject.
Imabuchi, Takashi; Prima, O. D. A.*
no journal, ,
no abstracts in English
Miyauchi, Satoru*; Imabuchi, Takashi; Hotta, Katsuyoshi*; Prima, O. D. A.*; Takeichi, Hiroshige*
no journal, ,
no abstracts in English
