Manda, S., Kurukuti, N., Hwang, A. D., Jung, J. - H., & Peli, E. (2022). Estimating Pedestrian Detection with peripheral prisms in Homonymous Hemianopia. In Invest. Ophthalmol. Vis. Sci. ARVO 2022 (Vol. 63, pp. E-abstract).
Bowers, A., Hwang, A. D., Jung, J. - H., Manda, S., Shekar, S., & Peli, E. (2022). Pilot testing of a pedestrian collision detection test for field expansion devices. In Invest. Ophthalmol. Vis. Sci. ARVO 2022 (Vol. 63, pp. E-abstract).
Peli, E., Goldstein, R., & Jung, J. - H. (2022). Scotoma Replacement: simulation of vision with photoreceptor scotoma. In Invest. Ophthalmol. Vis. Sci. ARVO 2022 (Vol. 63, pp. E-abstract).
Jung, J. - H., Hwang, A. D., Bowers, A., & Peli, E. (2022). Pedestrians Collision Detection Test for Peripheral Field Loss. In Invest. Ophthalmol. Vis. Sci. ARVO 2022 (Vol. 63, pp. E-abstract).
Jung, J. - H., Peli, E., Shekar, S., & Han, S. (2022). Peripheral binocular/monocular rivalry in vision multiplexing devices for mobility. In J. Vis. VSS 2022 (Vol. 22, pp. E-abstract) . The Annual Meeting of the Vision Sciences Society 2022.
Peli, E., Jung, J. - H., & Qui, C. (2022). Motion parallax in object recognition. . US Patent No. US11270451B . US patent.
Duan, H., Shen, W., Min, X., Tian, Y., Jung, J. - H., Yang, X., & Zhai, G. (2022). Develop then Rival: A Human Vision-Inspired Framework for Superimposed Image Decomposition. IEEE Transactions on Multimedia. Publisher's Version
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


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.


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.


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.


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.


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.

Peli, E., & Jung, J. - H. (2020). Active confocal imaging systems and methods for visual prostheses . US Patent No. US10857036B2 . US patent.
Peli, E., Vargas-Martin, F., Kurukuti, N. M., & Jung, J. - H. (2020). Multi-periscopic prism device for field expansion. Biomed. Opt. Express , 11 (9), 4872–4889 . OSA. Publisher's VersionAbstract
Patients with visual field loss frequently collide with other pedestrians, with the highest risk being from pedestrians at a bearing angle of 45&\#x00B0;. Current prismatic field expansion devices (&\#x2248;30&\#x00B0;) cannot cover pedestrians posing the highest risk and are limited by poor image quality and restricted eye scanning range (<5&\#x00B0;). A new field expansion device: multi-periscopic prism (MPP); comprising a cascade of half-penta prisms provides wider shifting power (45&\#x00B0;) with dramatically better image quality and wider eye scanning range (15&\#x00B0;) is presented. Spectacles-mounted MPPs were implemented using 3D printing. The efficacy of the MPP is demonstrated using perimetry, photographic depiction, and analyses of the collision risk covered by the devices.
Jung, J. - H., Castle, R., Kurukuti, N. M., Manda, S., & Peli, E. (2020). Field Expansion with Multiplexing Prism Glasses Improves Pedestrian Detection for Acquired Monocular Vision. Translational Vision Science & Technology , 9 (8), Article 35. Publisher's VersionAbstract
Patients with acquired monocular vision (AMV) lose vision in the temporal crescent on the side of the blind eye. This visual field loss affects patients’ ability to detect potential hazards in the blind field. Mounting a base-in multiplexing prism (MxP) on the nasal side of the seeing eye can provide true field expansion and enable detection of potential collision hazards. We evaluated the efficacy of the MxP glasses in a virtual reality walking environment. A three-dimensional printed clip-on MxP holder that can be adjusted for an individual user's facial parameters was developed. Virtual reality walking scenarios were designed to evaluate the effect of MxP field expansion on the detection of a pedestrian approaching from different initial bearing angles and courses. The pedestrian detection rates and response times of 10 participants with simulated AMV (normally sighted participants with one eye patched) and three patients with AMV were measured. The MxP provided true field expansion of about 25°. Participants performed significantly better with the MxP than without the MxP in the pedestrian detection task on their blind field, while their seeing field performance was not significantly different. The MxP glasses for patients with AMV improved the detection of potential collision hazards in the blind field. The MxP with an adjustable clip-on holder may help patients with AMV to decrease the risk of collision with other pedestrians.
jung_2020_tvst.xlsx [PDF]
Kurukuti, N. M., Tang, K., Jung, J. - H., & Peli, E. (2020). Effect of peripheral prism configurations on pedestrian collision detection while walking. In Invest. Ophthalmol. Vis. Sci. ARVO 2020 (Vol. 61, pp. E-abstract 2771).
Peli, E., Jung, J. - H., & Goldstein, R. (2020). Better simulation of vision with central and paracentral scotomas. In Invest. Ophthalmol. Vis. Sci. ARVO 2020 (Vol. 61, pp. E-abstract 3370).
Pamir, Z., Jung, J. - H., & Peli, E. (2020). Preparing participants for the use of the tongue visual sensory substitution device. Disability and Rehabilitation: Assistive Technology . Publisher's Version
Pamir, Z., Canoluk, M. U., Jung, J. - H., & Peli, E. (2020). Poor resolution at the back of the tongue is the bottleneck for spatial pattern recognition. Scientific Reports , 10 (1), 2435. Publisher's VersionAbstract
Spatial patterns presented on the tongue using electro-tactile sensory substitution devices (SSDs) have been suggested to be recognized better by tracing the pattern with the tip of the tongue. We examined if the functional benefit of tracing is overcoming the poor sensitivity or low spatial resolution at the back of the tongue or alternatively compensating for limited information processing capacity by fixating on a segment of the spatial pattern at a time. Using a commercially available SSD, the BrainPort, we compared letter recognition performance in three presentation modes; tracing, static, and drawing. Stimulation intensity was either constant or increased from the tip to the back of the tongue to partially compensate for the decreasing sensitivity. Recognition was significantly better for tracing, compared to static and drawing conditions. Confusion analyses showed that letters were confused based on their characteristics presented near the tip in static and drawing conditions. The results suggest that recognition performance is limited by the poor spatial resolution at the back of the tongue, and tracing seems to be an effective strategy to overcome this. Compensating for limited information processing capacity or poor sensitivity by drawing or increasing intensity at the back, respectively, does not improve the performance.
pamir-etal-2020-scirep-tracingstudy-data_3.xlsx [PDF]