Publications by Year: 2020

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]
Choi, H. - J., Peli, E., Park, M., & Jung, J. - H. (2020). Design of 45∘ periscopic visual field expansion device for peripheral field loss. Optics Communications , 454, 124364. Publisher's VersionAbstract
Patients with visual field loss have difficulty in mobility due to collision with pedestrians/obstacles from the blind side. In order to compensate for the visual field loss, prisms which deflect the field from the blind to the seeing side, have been widely used. However, the deflection power of current clinical Fresnel prisms is limited to ∼30°and only allows a 5°eye scanning range to the blind side. This is not sufficient to avoid most collisions and results in demands for a device with a higher power. In this paper, we propose a novel design and optimization of a higher power prism-like device (cascaded structure of mirror pairs filled with refractive medium) and verify enhanced field expansion of up to 45°in optical ray tracing and photorealistic simulations.