| 主权项 |
1. An optical system for eye tracking, comprising:
a prism having a first, second and third surface, the prism having a first optical axis intersecting the first surface, and a second optical axis intersecting and approximately orthogonal to the third surface; an imaging system and a sensor arranged along the second optical axis, wherein, the prism is configured such that an ocular object positioned about the first optical axis is imaged by the imaging system onto the sensor through the prism; wherein the prism is configured such that light from an ocular object positioned about the first optical axis enters the prism at the first surface and exits the prism through the third surface prior to being imaged by the imaging system onto the sensor; wherein the prism is configured such that light from an ocular object positioned about the first optical axis entering the prism along the first axis reflects off an interior side of the second surface and reflects off an interior side of the first surface before exiting the prism through the third surface, wherein the first surface is an exterior surface that includes a highly reflective coating for light within a predetermined wavelength range incident on an interior side of the first surface, and further comprising a corrective optical element arranged along the first optical axis, wherein the corrective optical element has a first surface adjacent to the second surface of the prism, and a second surface, and wherein the corrective optical element is arranged such the corrective optical element counteracts any visual distortion introduced by the prism when looking through the prism and the corrective optical element along the first optical axis. |
