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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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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.
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.
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.
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.
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