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Multi-periscopic prism device for field expansion.

Eli Peli1, Fernando Vargas-Martin2, Nish Mohith Kurukuti1

  • 1Schepens Eye Research Institute of Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, 20 Staniford St, Boston, MA 02114, USA.

Biomedical Optics Express
|October 5, 2020
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Summary
This summary is machine-generated.

New multi-periscopic prism (MPP) devices improve visual field expansion for patients with visual field loss. These spectacles offer wider coverage and better image quality, reducing collision risks with pedestrians.

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Area of Science:

  • Ophthalmology
  • Optics
  • Biomedical Engineering

Background:

  • Patients with visual field loss face high collision risks, particularly from pedestrians at a 45° bearing angle.
  • Existing prismatic field expansion devices offer limited coverage (≈30°), poor image quality, and restricted eye scanning (<5°).

Purpose of the Study:

  • To introduce and evaluate a novel multi-periscopic prism (MPP) device for enhanced visual field expansion.
  • To address the limitations of current devices in mitigating collision risks for visually impaired individuals.

Main Methods:

  • Development of spectacles-mounted multi-periscopic prisms (MPPs) utilizing 3D printing.
  • Implementation of a cascade of half-penta prisms to achieve wider shifting power (45°) and scanning range (15°).
  • Efficacy assessment through perimetry, photographic depiction, and collision risk analysis.

Main Results:

  • The MPP device provides significantly wider shifting power (45°) compared to existing devices.
  • MPPs demonstrate dramatically improved image quality and a wider eye scanning range (15°).
  • The device effectively covers a broader range of potential collision risks.

Conclusions:

  • The multi-periscopic prism (MPP) represents a significant advancement in visual field expansion technology.
  • MPPs offer enhanced visual coverage and image quality, potentially reducing pedestrian collision risks for patients with visual field loss.
  • This novel device shows promise for improving mobility and safety in visually impaired individuals.