Eye-tracking fundus imaging system

Abstract

A head mounted display includes a display layer, an array of light sources, a first optical combiner, and a second optical combiner. The array of light sources are configured to be selectively enabled to emit non-visible light to illuminate a fundus of an eye. The first optical combiner is configured to receive reflected non-visible light that is reflected by the eye, direct a first component of the reflected non-visible light to a first camera to generate an image of the eye, and pass a second component of the reflected non-visible light. The second optical combiner is configured to receive a fundus imaging light responsive to the second component of the reflected non-visible light, and to direct the fundus imaging light to a second camera to generate an image of the fundus.

What is claimed is: 
     
         1 . A head mounted display (HMD), comprising:
 a display layer configured to emit a display light for presentation to a user;   an array of light sources disposed on the display layer and configured to be selectively enabled to emit non-visible light to illuminate a fundus of an eye of the user;   a first optical combiner disposed between the array of light sources and an eyeward side of the HMD, wherein the first optical combiner is configured to:
 receive reflected non-visible light that is reflected by the eye, 
 direct a first component of the reflected non-visible light to a first camera to generate an image of the eye, and 
 pass a second component of the reflected non-visible light; and 
   a second optical combiner disposed between the array of light sources and the first optical combiner, wherein the second optical combiner is configured to:
 receive a fundus imaging light responsive to the second component of the reflected non-visible light, and 
 direct the fundus imaging light to a second camera to generate an image of the fundus. 
   
     
     
         2 . The HMD of  claim 1 , wherein the first component of the reflected non-visible light is a first polarization orientation, and wherein the second component of the reflected non-visible light is a second polarization orientation that is orthogonal to the first polarization orientation. 
     
     
         3 . The HMD of  claim 2 , wherein the first optical combiner comprises a first polarized volume hologram configured to direct the reflected non-visible light of the first polarization orientation and to pass the reflected non-visible light of the second polarization orientation. 
     
     
         4 . The HMD of  claim 1 , wherein the second optical combiner is configured to direct light to the second camera based on a wavelength of the fundus imaging light having a same wavelength as the non-visible light. 
     
     
         5 . The HMD of  claim 4 , wherein the second optical combiner comprises a second polarized volume hologram configured to direct the fundus imaging light to the second camera based on a polarization orientation and the wavelength of the fundus imaging light. 
     
     
         6 . The HMD of  claim 4 , wherein the second optical combiner comprises a hot mirror that is configured to direct the fundus imaging light to the second camera based on the wavelength of the fundus imaging light. 
     
     
         7 . The HMD of  claim 1 , wherein the first optical combiner and the second optical combiner are transmissive to the display light.