| 摘要 |
Abnormality determination of eyeball illumination is performed by a computer on the basis of the output level, i.e., lightness of a cornea reflection image. When an abnormality is determined, a display indicating it is made and a warning is given. At the same time, power supply for eyeball illumination is stopped. The abnormality determination of eyeball illumination is performed by comparing the output level of a cornea reflection image with a predetermined reference value or comparing the output level ratio or difference of the cornea reflection image with a predetermined reference value.
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