Publications by Year: 2021

2021
Avraham, D., Jung, J. - H., Yitzhaky, Y., & Peli, E. (2021). Simulating the effects of persistence and perceptual fading in retinal prosthetic vision. 12th The Eye and the Chip World Research Congress 2021.
Jung, J. - H., Peli, E., & Han, S. (2021). Photographic Depiction and Virtual Reality Illustration of the Field of View through Low Vision Devices. In Optometry and Vision Science, Academy 2021 (Vol. 98, pp. E-abstract).
Falahati, M., Kurukuti, N. M., Peli, E., & Jung, J. - H. (2021). Oblique multi-periscopic prism for field expansion in homonymous hemianopia driving. In Invest. Ophthalmol. Vis. Sci. ARVO 2021 (Vol. 62, pp. E-abstract 3577). Publisher's Version
Jung, J. - H., & Peli, E. (2021). Apparent viewpoint of shifted view through prisms. In Invest. Ophthalmol. Vis. Sci. ARVO 2021 (Vol. 62, pp. E-abstract 1445). Publisher's Version
Avraham, D., Jung, J. - H., Yitzhaky, Y., & Peli, E. (2021). Retinal prosthetic vision simulation: temporal aspects. Journal of Neural Engineering , 18 (4), 0460d9. Publisher's VersionAbstract
Objective. The perception of individuals fitted with retinal prostheses is not fully understood, although several retinal implants have been tested and commercialized. Realistic simulations of perception with retinal implants would be useful for future development and evaluation of such systems. Approach. We implemented a retinal prosthetic vision simulation, including temporal features, which have not been previously simulated. In particular, the simulation included temporal aspects such as persistence and perceptual fading of phosphenes and the electrode activation rate. Main results. The simulated phosphene persistence showed an effective reduction in flickering at low electrode activation rates. Although persistence has a positive effect on static scenes, it smears dynamic scenes. Perceptual fading following continuous stimulation affects prosthetic vision of both static and dynamic scenes by making them disappear completely or partially. However, we showed that perceptual fading of a static stimulus might be countered by head-scanning motions, which together with the persistence revealed the contours of the faded object. We also showed that changing the image polarity may improve simulated prosthetic vision in the presence of persistence and perceptual fading. Significance. Temporal aspects have important roles in prosthetic vision, as illustrated by the simulations. Considering these aspects may improve the future design, the training with, and evaluation of retinal prostheses.
Jung, J. - H., Kurukuti, N. M., & Peli, E. (2021). Photographic Depiction of the Field of View with Spectacles-mounted Low Vision Aids. Optometry and Vision Science , 98 (10), 1210-1226. Publisher's VersionAbstract

SIGNIFICANCE 

Photographic depiction helps to illustrate the primary and secondary field of view effects of low vision devices along with their utility to clinicians, patients, and caretakers. This technique may also be helpful for designers and researchers in improving the design and fitting of low vision devices.

PURPOSE 

The field of view through spectacles-mounted low vision devices has typically been evaluated using perimetry. However, the perimetric field diagram is different from the retinal image and often fails to represent the important aspects of the field of view and visual parameters. We developed a photographic depiction method to record and veridically show the field of view effects of these devices.

METHODS 

We used a 3D-printed holder to place spectacles-mounted devices at the same distance from the empirically determined reference point of the field of view in a camera lens (f = 16 mm) as they would be from an eye, when in use. The field of view effects of a bioptic telescope, a minifier (reverse telescope), and peripheral prisms were captured using a conventional camera, representing retinal images. The human eye pupil size (adjusting the F number: f/2.8 to f/8 and f/22 in the camera lens) and fitting parameters (pantoscopic tilt and back vertex distance) varied.

RESULTS 

Real-world indoor and outdoor walking and driving scenarios were depicted as retinal images illustrating the field of view through low vision devices, distinguishing optical and obscuration scotomas, and demonstrating secondary effects (spatial distortions, viewpoint changes, diplopia, spurious reflection, and multiplexing effects) not illustrated by perimetric field diagrams.

CONCLUSIONS 

Photographic depiction illustrates the primary and secondary field of view effects of the low vision devices. These images highlight the benefit and possible trade-offs of the low vision devices and may be beneficial in education and training.

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