Active photonic sensing for super-resolved reading performance in simulated prosthetic vision

Abraham, Chen; Farah, Nairouz; Gerbi-Zarfati, Liron; Harpaz, Yuval; Zalvesky, Zeev; Mandel, Yossi

doi:10.1364/boe.10.001081

Cited by 2 publications

(1 citation statement)

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“…The image of the scene is captured by a head mounted camera, digitalized by a computer, and a sub-sampled low resolution image is presented on the HMDs. In this way, a variety of tasks have been evaluated using SPV and encouraging performance results were reported on reading speed [57][58][59][60], navigation [61][62][63], object recognition [45,64], hand-eye coordination [65] and face recognition [57,66], among others. However, visual acuity tests are the principle quantitative measures used to assess the efficacy and cost effectiveness of procedures designed to improve or restore vision [67,68].…”

Section: Discussionmentioning

confidence: 99%

Assessing visual acuity in visual prostheses through a virtual-reality system

Sanchez-Garcia¹,

Morollon-Ruiz²,

Martínez-Cantín³

et al. 2022

Preprint

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Objective. Current visual implants still provide very low resolution and limited field of view, thus limiting visual acuity in implanted patients. Developments of new strategies of artificial vision simulation systems by harnessing new advancements in technologies are of upmost priorities for the development of new visual devices. Approach. In this work, we take advantage of virtual-reality software paired with a portable head-mounted display and evaluated the performance of normally sighted participants under simulated prosthetic vision with variable field of view and number of pixels. Our simulated prosthetic vision system allows simple experimentation in order to study the design parameters of future visual prostheses. Ten normally sighted participants volunteered for a visual acuity study. Subjects were required to identify computer-generated Landolt-C gap orientation and different stimulus based on light perception, time-resolution, light location and motion perception commonly used for visual acuity examination in the sighted. Visual acuity scores were recorded across different conditions of number of electrodes and size of field of view. Main results. Our results showed that of all conditions tested, a field of view of 20 • and 1000 phosphenes of resolution proved the best, with a visual acuity of 1.3 logMAR. Furthermore, performance appears to be correlated with phosphene density, but showing a diminishing return when field of view is less than 20 • . Significance. The development of new artificial vision simulation systems can be useful to guide the development of new visual devices and the optimization of field of view and resolution to provide a helpful and valuable visual aid to profoundly or totally blind patients.

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