Functional vision testing using light field displays
Systems and methods for performing visual field testing using light field displays are described. The light field display ( 201, 202; 801; 504; 601 - 604; 704; 801 ), that can correct for the focus and cylindrical refractive error of the subject, can be used to perform a variety of visual field testing strategies by rendering visual stimuli to the eye ( 203 ). The light field display may be included near the subject's eye, or reimaged by a relay optical system ( 802 ). Several embodiments of head and arm mounted systems ( 711; 704 ) including a near eye light field display ( 704 ) are presented.
1. A method for testing the visual sensitivity of an eye of a subject, comprising:
displaying a plurality of visual stimuli to different locations of the eye of the subject, said stimuli generated using a light field display, wherein the light field display corrects for the refractive error of the subject's eye when generating the visual stimuli;
recording the response of the subject to the stimuli;
processing the responses to determine the subject's visual sensitivity at different locations in the eye.
2. A method as recited in claim 1 , wherein the refractive error is focus.
3. A method as recited in claim 1 , where the refractive error is spherical or cylindrical.
4. A method as recited in claim 1 , wherein the stimuli are part of a standard automated perimetry test.
5. A method as recited in claim 1 , further comprising performing a second type of vision testing using the light field display.
6. A method as recited in claim 1 , wherein the stimuli are displayed in the central field of vision of the subject and further comprising controlling the illumination in the periphery.
7. A methods as recited in claim 6 , wherein the illumination in the periphery is controlled using a second light field display or a non-stimulus producing homogenous illumination control.
8. A method as recited in claim 1 , further comprising recording an image of the subject's eye during the test and using the images to do one of: adjust the position of a stimulus, delay the presentation of a stimulus, or adjust the test results.
9. A method as recited in claim 1 , further comprising presenting auditory information to the subject during the test.
10. A method as recited in claim 1 , wherein the response of the subject is recorded using a button click or a microphone.
11. A method as recited in claim 1 , wherein the displaying, recording and processing steps are carried out on both eyes in a binocular arrangement.
12. A device for testing the visual sensitivity of an eye of a subject comprising:
a light field display for generating a plurality of visual stimuli presented to different locations of the eye of the subject wherein the light field display corrects for the refractive error of the subject's eye when generating the visual stimuli;
a feedback collection detector for recording the response of the subject to the stimuli presentations; and
a processor for analyzing the responses from the feedback collection detector to map the visual sensitivity of the subject at different locations in the eye.
13. A device as recited in claim 12 , wherein the light field display comprises an active source display coupled to a passive beam steering array.
14. A device as recited in claim 13 , wherein the active source display is an organic light emitting diode (OLED) array.
15. A device as recited in claim 13 , wherein the passive beam steering array is a lenslet array.
16. A devices as recited in claim 12 , further comprising an imaging system for recording images of the subject's eye during the testing.
17. A device as recited in claim 12 , wherein the device is mounted to the subject's head.
18. A device as recited in claim 12 , wherein the device is mounted to an adjustable arm for positioning relative to the subject's eye.
19. A device as recited in claim 12 , wherein the visual stimuli are presented to the central region of the subject's field of view.
20. A device as recited in claim 19 , further comprising a second light field display for controlling the illumination in the periphery of the visual field during the testing.
21. A device as recited in claim 19 , further comprising a light pipe for controlling the illumination in the periphery of the visual field during the testing.
22. A device as recited in claim 12 , further comprising a second light field display for generating a plurality of visual stimuli presented to different locations on the second eye of the subject in a binocular arrangement.