| 摘要 |
An optical apparatus includes a pupil illuminator for illuminating the pupil of an eye of an individual, an imager for obtaining an image of the pupil and an image of the cornea of the eye, a presentor for preliminarily presenting an image positioned at a particular point to the eye, and a direction-of-line-of-sight calculator for calculating the direction of the line of sight of the eye using the positional relationship between the image of the pupil and the image of the cornea on an imaging surface of the imager, and calculating the direction of the line of sight using parameters relating to the image of the pupil and the image of the cornea. The values of the parameters are obtained from the positional relationship between the image of the pupil and the image of the cornea on the imaging surface of the imager when the eye views the image at the particular point.
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