# Monocular Visual Confusion for Field Expansion

> **NIH NIH R01** · SCHEPENS EYE RESEARCH INSTITUTE · 2022 · $429,953

## Abstract

PROJECT SUMMARY/ABSTRACT
Individuals with visual field loss report collisions with other pedestrians or objects and are commonly not
permitted to drive. All of these factors severely restrict their independence and quality of life. Various visual
aids developed for field expansion to detect collision in mobility but had limited success. The novel concept of
vision multiplexing by shifting, combined with binocular visual confusion, has been a proven effective aid for
patients with homonymous hemianopia. This approach uses peripheral unilateral prisms (prisms on one eye)
and thus shows a shifted view from the blind field in the eye with the prism while the fellow eye sees the
normal view. With binocular visual confusion, patients with homonymous hemianopia sees both shifted view
and normal view together and achieve true field expansion using unilateral prisms. However, this approach
results in the rivalry between two different views from two eyes, which alternates and reduce the detection
performance in half.
 To overcome this limitation, we invented a new optical element, multiplexing prism, which provides
simultaneous (monocularly) superimposed views of the shifted and direct see-through fields of view. Bilateral
fitting of multiplexing prisms (prisms on both eyes) shows both shifted and see-through views in each eye and
thus may reduce the binocular rivalry and provide three-dimensional information of shifted and see-through
views. However, as a trade-off, the contrast of each view is reduced in half. Here, we will study the impact of
these factors on the collision detection in field expansion of patients with homonymous hemianopia using
virtual reality walking simulator and find the best configuration with less rivalry.
 The multiplexing prism is also the only possible field expansion solution for patients with acquired
monocular vision. Losing sight of an eye is one of the common field loss in the US and increase the risk of
collision with other pedestrians from the nasal side of the seeing eye. Since the multiplexing prism provides
both see-through and shifted views simultaneously, fitting the multiplexing prism on the nose bridge provides
recover of the visual field up to 90°, which recovers almost normal binocular visual field size. Here we propose
to implement, tune, and test the effectiveness of the multiplexing prism as an aid for patients with acquired
monocular vision and develop a hang-on multiplexing prism glasses for easy wearing/taking off. We will test
the device in a clinical trial with virtual reality walking simulator.

## Key facts

- **NIH application ID:** 10474347
- **Project number:** 5R01EY031777-03
- **Recipient organization:** SCHEPENS EYE RESEARCH INSTITUTE
- **Principal Investigator:** Jae-Hyun Jung
- **Activity code:** R01 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2022
- **Award amount:** $429,953
- **Award type:** 5
- **Project period:** 2020-09-01 → 2024-08-31

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/10474347

## Citation

> US National Institutes of Health, RePORTER application 10474347, Monocular Visual Confusion for Field Expansion (5R01EY031777-03). Retrieved via AI Analytics 2026-05-23 from https://api.ai-analytics.org/grant/nih/10474347. Licensed CC0.

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