| Digitalized Eye Movement recording and Verification of its Reproducibility. |
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Sueng Han Han, Hong Bok Kim, Jong Bok Lee, Oh Woong Kwon, Sun Kok Yoo |
1The Institute of Vision Research, College of Medicine, Yonsei University.
2Department of Ophthalmology, College of Medicine, Yonsei University. |
| 디지털 방식의 안운동 기록과 측정치의 재현성 |
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김홍복(Hong Bok Kim),한승한(Seung Han Han),이종복(Jong Bok Lee),권오웅(Oh Woong Kwon),유선국(Sun Kok Yoo) |
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| Abstract |
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Many diagnostic tools, which record eye movement, are available for diagnosis and treatment of the patients with impaired eye movement. Most of these tools cannot record directly the eye movement but record electrical analog signal developed when eyeball moves through electrode attached on skin or sclera. Because they need a fixation device, they may bring a patient discomfort. It is well known that digital recording device is not interfered by external noise signal and that its reproducibility is acceptable. We have developed a noninvasive, direct, and precise technique for recording eye movement and verified its reproducibility. We video-taped the horizontal and vertical eye movement and processed the captured images digitally using a image analysis program. the result showed the frequency energy of eye movement in the range within 6Hz and at 10 or 11Hz. The eye movement was observed more clearly after filtering the low frequency energy by inverse Fourier transformation. The reproducibility for measurements of total variability were as follows; vertical displacement measurements, 1.21%; horizontal displacement measurements, 0.68%. In conclusion, this new technique is easy and comfortable to examiner and patient. Its reproducibility was acceptable. Thus it may served as a substitute of conventional tools for recording eye movement. |
| Key Words:
Digital;Image analysis;Fast Fourier transformation;Reproducibility |
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