| 摘要 |
<p>1. An optical device for measuring the position of the visual axis of the main or other visual directions of both eyes and for measuring anomalies of binocular vision, the device being adapted to be fitted in front of the patient's eyes and comprising : a support (1) carrying two mobile transparent polarizing screens (2, 3) ; means for moving the same in front of both eyes ; means for detecting the position of the screens relatively to the support (1) ; a target (4) separate therefrom and adapted to be placed before, and to be visible by, the patient and having a central zone whose polarization axis is perpendicular to that of the polarizing screens (2, 3), characterised in that each polarizing screen (2, 3) is formed, near its side edge (2a, 3a) nearest the axis of symmetry of the support (1) passing between the two screens, with a slot (5a, 6a) substantially parallel to the latter axis and near its bottom edge (2b, 3b) with a slot (5b, 6b) substantially perpendicular to the first-mentioned slot (5a, 6a) ; the means for moving the two screens (2, 3) comprise for each screen a single drive motor (9, 10) co-operating with transmission means (7, 8) such that the screen slots (5a, 6a; 5b, 6b) of the screens stay parallel to themselves during movements of the screens ; and the means for moving the two screens (2, 3) and the transmission means are adapted to move the two screens between a first position, in which the bottom edge (2b, 3b) of the screens (2, 3) is disposed above the visual direction of both eyes, a second position, in which the visual direction of the corresponding eye directed towards the target (4) extends through the slot (5b, 6b) near the bottom edge (2b, 3b) of each screen, and a third position, in which the said visual direction extends through the slot (5a, 6a) near the side edge (2a, 3a) of each screen.</p> |
