| 摘要 |
<p>An optical instrument, such as a microscope or a camera, is provided for forming a viewable image of an object. The optical instrument comprises an objective lens for forming the viewable image at an image plane, an eyepiece through which the user can view the viewable image at the image plane, an eye sensor for sensing the direction of gaze of a user viewing the viewable image and means for controlling a controllable function of the optical instrument in dependence upon the sensed direction of gaze. The eye sensor comprises a light source for outputting light through the eyepiece towards the user's eye, a lens associated with the light source for causing the light from the source to be substantially columnated when it exits the eyepiece towards the user's eye, an imaging transducer for imaging the front of the user's eye through the eyepiece and for generating an electrical image signal of the front of the user's eye and processing means for processing the electrical image signal to determine the location of the user's pupil centre and the location of a reflection of the light from said light source to determine therefrom the gaze information indicative of the direction of gaze of the user.</p> |
