June 2013
Volume 54, Issue 15
Free
ARVO Annual Meeting Abstract  |   June 2013
Design of a Compact Wide-Field-of-View Camera for Retinal Prostheses
Author Affiliations & Notes
  • Furkan Sahin
    Department of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, CA
  • Ben McIntosh
    Department of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, CA
  • Patrick Nasiatka
    Department of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, CA
  • James Weiland
    Departments of Biomedical Engineering, and Ophthalmology, University of Southern California, Los Angeles, CA
  • Mark Humayun
    Departments of Ophthalmology, Cell and Neurobiology, and Biomedical Engineering, University of Southern California, Los Angeles, CA
  • Armand Tanguay
    Departments of Electrical Engineering-Electrophysics, Biomedical Engineering, and Ophthalmology, University of Southern California, Los Angeles, CA
  • Footnotes
    Commercial Relationships Furkan Sahin, None; Ben McIntosh, None; Patrick Nasiatka, None; James Weiland, Second Sight Medical Products, Inc. (F); Mark Humayun, Bausch & Lomb (F), Bausch & Lomb (C), Bausch & Lomb (P), Bausch & Lomb (R), Bausch & Lomb (S), Alcon (C), Alcon (R), Iridex (P), Iridex (R), Replenish (I), Replenish (C), Replenish (R), Replenish (S), Second Sight (F), Second Sight (I), Second Sight (C), Second Sight (P), Second Sight (R), Second Sight (S), Regenerative Patch Technologies (I), Regenerative Patch Technologies (C); Armand Tanguay, University of Southern California (P)
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2013, Vol.54, 1068. doi:
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    • Get Citation

      Furkan Sahin, Ben McIntosh, Patrick Nasiatka, James Weiland, Mark Humayun, Armand Tanguay; Design of a Compact Wide-Field-of-View Camera for Retinal Prostheses. Invest. Ophthalmol. Vis. Sci. 2013;54(15):1068.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 
Purpose
 

To design and implement an ultraminiature, head-mounted, wide-field-of-view extraocular camera that can be used in conjunction with an ultraminiature eye-tracking camera to restore natural foveation capabilities to patients implanted with intraocular retinal prostheses.

 
Methods
 

In the proposed approach, a wide-field-of-view image of the outside world is captured with the wide-field-of-view camera. The eye-tracking camera in conjunction with appropriate software algorithms extracts the direction of gaze, and the corresponding subregion of the full camera field of view is exported to the microstimulator array of the retinal prosthesis. Custom compact multi-element 90° and 120° wide-field-of-view lenses were first designed. Based on these designs, less optimal but commercially available miniature lenses were chosen with matching parameters, and the optical system design reoptimized. The wide-field-of view extraocular camera can easily fit on a pair of eyeglasses in such a way as to be relatively unobtrusive yet add minimal weight and volume.

 
Results
 

A compact, low mass, wide-field-of-view optical system has been designed and successfully implemented. This lens system has four commercially available spherical lens elements. The lens system provides a diagonal field of view of 100°, and fits into a housing with dimensions of only 8 mm diameter and 8 mm overall length. This lens design was coupled with a commercially available wide dynamic range image sensor (OV10633) from OmniVision Technologies and test images have been successfully captured. Any wide field of view optical system generates a degree of unwanted image (typically barrel) distortion that may cause adverse complications with either direct stimulation of the visual system or the implementation of subsequent image processing algorithms. To this end, an image dewarping algorithm capable of removing this distortion in real time has been developed that has the additional feature of greatly reducing the associated chromatic aberration in the image.

 
Conclusions
 

A very compact wide field of view camera was designed to be used in conjunction with an eye-tracking camera to restore natural foveation for retinal prosthesis patients.

 
 
Test image of common grocery items captured with the designed and implemented wide-field-of-view camera.
 
Test image of common grocery items captured with the designed and implemented wide-field-of-view camera.
 
 
Same image, but following software dewarping with chromatic aberration correction to achieve a rectilinear, chromatically corrected image.
 
Same image, but following software dewarping with chromatic aberration correction to achieve a rectilinear, chromatically corrected image.
 
Keywords: 549 image processing • 522 eye movements • 412 age-related macular degeneration  
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