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Multiplexing Prisms for Field Expansion.

Eli Peli1, Jae-Hyun Jung

  • 1Schepens Eye Research Institute, Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|July 21, 2017
PubMed
Summary
This summary is machine-generated.

A novel multiplexing prism (MxP) overcomes apical scotoma limitations for monocular visual field expansion. This new optical device effectively expands visual fields for patients with hemianopia or constricted peripheral vision.

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Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Visual Science

Background:

  • Conventional prisms for visual field expansion are limited by apical scotomas, particularly problematic for monocular patients.
  • Unilateral prism fitting in binocular patients allows the other eye to compensate for apical scotomas, a strategy unavailable to monocular individuals.

Purpose of the Study:

  • To introduce and evaluate a novel optical device, the multiplexing prism (MxP), designed to overcome the apical scotoma limitation in monocular visual field expansion.
  • To demonstrate the potential of MxP technology for various visual field loss conditions.

Main Methods:

  • Developed a Fresnel-prism-like device with alternating prism and flat elements to superimpose shifted, see-through views.
  • Evaluated MxP implementations for monocular conditions with visual field loss, comparing field expansion with conventional prisms using perimetry.
  • Verified the ability to control the contrast ratio between superimposed images.

Main Results:

  • MxPs effectively expand visual fields without apical scotomas in monocular patients with hemianopia or constricted peripheral fields.
  • Demonstrated increased nasal visual field for a patient with a single functioning eye and for patients with bitemporal hemianopia.
  • Showed that MxPs placed at the far temporal field can expand the normal visual field.

Conclusions:

  • A novel optical device, the multiplexing prism (MxP), shows significant potential for visual field expansion technology.
  • MxPs offer a promising, potentially inexpensive, and cosmetically acceptable solution for various visual field loss conditions.