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Classification of optokinetic nystagmus in severe cerebral palsy using eye tracking system Kenji Suzuki 1 , Takahiro Niida 1 , Tsukasa Satou 1 , Yoshiaki Takahashi 1 , Tsuyoshi Nogami 1 , Naoto Hara 1 , Yukiko Fujiyama 1 1Department of Orthoptics and Visual Sciences, School of Health Sciences, International University of Health and Welfare pp.543-550
Published Date 2018/4/15
DOI https://doi.org/10.11477/mf.1410212660
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Abstract Purpose:Optokinetic nystagmus(OKN)was assessed in four patients with severe cerebral palsy(CP)using eye tracker. Elicited OKN was classified as either look OKN(LOKN), which involves active tracking;or stare OKN(SOKN), which involves passive viewing.

Subjects and Method:The subjects were four patients with severe spastic CP. Eye movement was recorded using eye tracker. For the visual stimulus, a 0.3 cycles/degree square wave chart was moved horizontally at a speed of 10 degree/s(dps)for 5 seconds. Intervals were placed between successive stimuli. The eye movement velocity during visual stimulus presentation was compared with the eye movement velocity during the intervals. The slow-phase velocity of OKN was calculated based on gaze position. A velocity of ≧3.0 dps was classified as LOKN, while a velocity of <3.0 dps was classified as SOKN.

Result:All patients showed a significant difference between eye movement velocity during visual stimulus presentation and during the intervals. The slow-phase velocities for the four patients were 3.4, 4.0, 4.6, and 1.8 dps;thus, three patients' OKN was classified as LOKN, while one patient's OKN was classified as SOKN.

Conclusion:The method described in the present study was used to classify the OKN of four patients with severe CP as LOKN or SOKN;the three patients whose OKN was classified as LOKN were observed to be capable of using active vision. The method in the present study promises as an objective method for assessing visual function in patients with severe CP.


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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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