Paragraph Text Reading Using a Pixelized Prosthetic Vision Simulator: Parameter Dependence and Task Learning in Free-Viewing Conditions

Dagnelie, Gislin; Barnett, David; Humayun, Mark S.; Thompson, Robert W.

doi:10.1167/iovs.05-0157

Cited by 84 publications

(94 citation statements)

References 33 publications

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“…In the meantime, however, under the assumption that the image perceived by a retinal prosthesis wearer may indeed be composed of a regular field of fuzzy dots, one can model vision conveyed by such a device through real-time image processing, and present the resulting view to sighted individuals to determine how well they can base decisions on such sparse visual information. Visual object [7] and face [8] identification as well as reading [9][10][11][12] performance using simplified versions of such simulations have been reported previously by researchers in our laboratory and elsewhere; we will refer to this type of visual imagery as pixelized vision.…”

Section: Introductionmentioning

confidence: 83%

Playing checkers: detection and eye–hand coordination in simulated prosthetic vision

Dagnelie

Walter

Yang

2006

Journal of Modern Optics

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In order to assess the potential for visual inspection and eye-hand coordination without tactile feedback under conditions that may be available to future retinal prosthesis wearers, we studied the ability of sighted individuals to act upon pixelized visual information at very low resolution, equivalent to 20/2400 visual acuity. Live images from a head-mounted camera were low-pass filtered and presented in a raster of 6 Â 10 circular Gaussian dots. Subjects could either freely move their gaze across the raster (free-viewing condition) or the raster position was locked to the subject's gaze by means of video-based pupil tracking (gazelocked condition). Four normally sighted and one severely visually impaired subject with moderate nystagmus participated in a series of four experiments. Subjects' task was to count 1 to 16 white fields randomly distributed across an otherwise black checkerboard (counting task) or to place a black checker on each of the white fields (placing task). We found that all subjects were capable of learning both tasks after varying amounts of practice, both in the free-viewing and in the gaze-locked conditions. Normally sighted subjects all reached very similar performance levels independent of the condition. The practiced performance level of the visually impaired subject in the free-viewing condition was indistinguishable from that of the normally sighted subjects, but required approximately twice the amount of time to place checkers in the gaze-locked condition; this difference is most likely attributable to this subject's nystagmus. Thus, if early retinal prosthesis wearers can achieve crude form vision, then on the basis of these results they too should be able to perform simple eye-hand coordination tasks without tactile feedback.

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Section: Introductionmentioning

confidence: 83%

Playing checkers: detection and eye–hand coordination in simulated prosthetic vision

Dagnelie

Walter

Yang

2006

Journal of Modern Optics

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“…Inspiring results were reported 0020-0255/$ -see front matter Ó 2010 Elsevier Inc. All rights reserved. doi:10.1016/j.ins.2010.04.021 on Latin word recognition [24,25,34], Chinese character recognition [8], reading speed [5][6][7], text or paragraph reading [35,15,10], maze navigation [6], object recognition [19], hand-eye coordination [19], way finding [11], etc. However, it is important to confirm the minimum requirements for visual prostheses through different experiments.…”

Section: Introductionmentioning

confidence: 99%

Image processing based recognition of images with a limited number of pixels using simulated prosthetic vision

Zhao

Lü

Tian

et al. 2010

Information Sciences

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“…In addition, a number of papers have attempted to determine reading requirements. [44][45][46][47][48] There has been considerable research in image-processing algorithms to assist the visually impaired, which could be integrated into visual prosthesis systems.…”

Section: Image-processing and Simulation Researchmentioning

confidence: 99%

Current and future prospects for optoelectronic retinal prostheses

Dowling

2008

Eye

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There has been accelerating progress in the development of retinal prosthesis systems designed to partially restore vision to people with retinitis pigmentosa or macular degeneration. Current retinal prostheses can be divided into two types: those that receive power and information from passive or active photodiodes (optoelectronic systems) and those based on multielectrode arrays powered by cables or transcutaneous telemetry systems. Currently, four research groups have ongoing chronic implantation clinical studies, and two of these groups plan to have commercial retinal prosthesis systems available within the next 2 years. This paper reviews the development and current status of the most significant international retinal prosthesis research groups and discusses future prospects and issues associated with their retinal prosthesis systems.

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Paragraph Text Reading Using a Pixelized Prosthetic Vision Simulator: Parameter Dependence and Task Learning in Free-Viewing Conditions

Cited by 84 publications

References 33 publications

Playing checkers: detection and eye–hand coordination in simulated prosthetic vision

Playing checkers: detection and eye–hand coordination in simulated prosthetic vision

Image processing based recognition of images with a limited number of pixels using simulated prosthetic vision

Current and future prospects for optoelectronic retinal prostheses

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