| 摘要 |
A communication device comprises a carrier (2), on which at least a picture emitting element (17), an optical system and a light sensitive element (14) are arranged at mutually fixed distances, said carrier being intended to be located closely in front of and in a predetermined position with respect to an eye to be examined of a person. The device further comprises means arranged to enable the optical system to throw at least two pieces of image information emanating from the eye of the person upon said light sensitive element (14, 15), the mutual distance on the light sensitive element of which is a function of the angle made by the gaze direction of the eye with the optical axis of the optical system and independent of possible small lateral displacements between the carrier and the eye of the person. An evaluating unit (21) is arranged to calculate said angle and thus the gaze direction of the person from said pieces of information. |
