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OpenTrials
Completed

NCT Number: NCT06027216

Multiplexing Prism Fitting for Field Expansion of Monocular Vision

The investigators are developing an assistive device, known as multiplexing prism that expands the field of view for individuals with acquired monocular vision (loss of an eye). The investigators are testing a simplified design and fitting protocol to provide field expansion for individuals with acquired monocular vision.

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Key information

Conditions

One Eye Blindness Blind Left Eye Blind Right Eye Blindness Eye Diseases Nervous System Diseases Neurologic Manifestations Pathological Conditions, Signs and Symptoms Sensation Disorders Signs and Symptoms Vision Disorders

Age range

16 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Schepens Eye Research Institute

Boston, Massachusetts, 02114, United States

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • No medical health issues such as seizures, motor movements problem
  • Loss of vision in one eye (less than 20/200) for >1 year)
  • Visual acuity of the seeing eye: Better than 20/32 visual acuity with correction
  • No visual field defect in the seeing eye (nasal field of at least >45degree)
  • No medical health issues such as seizures, motor movements problem

Exclusion criteria

  • Patients with any physical or mental disabilities, including cognitive dysfunction, balance problems, or other deficits that could impair their ability to respond to the stimuli presented in this study will be excluded
  • Any person with motor movements problem (e.g., unable to use extremities)

Treatment and study plan

Multiplexing Prism

Device

Multiplexing prism is designed for spatial vision multiplexing. It allows partial light transmission through the prism allow the observer to simultaneously see the physical world through the prism and see the "shifted view" from the non-seeing side. It is developed to expand the field of view of individuals with just one eye.

Primary outcomes

  1. Gain in Visual Field With the Multiplexing Prism

    Time frame: Visit 2 of Study (approximately 2-3 weeks after 1st Visit)

    Field expansion is calculated based on the difference of the maximum field of view on the nasal side of the seeing/functioning eye (same side as the blind eye) with and without multiplexing prism.

Secondary outcomes

  1. Maximum Extent of Nasal Visual Field With the Multiplexing Prism

    Time frame: Visit 2 of Study (approximately 2-3 weeks after 1st Visit)

    The farthest extent of the nasal visual field with the multiplexing prism placed in front of the seeing eye.

Sponsors and collaborators

Lead sponsor

Massachusetts Eye and Ear Infirmary

Other

Collaborators

  • National Eye Institute (NEI)

Registry information

Official study title

Monocular Visual Confusion for Field Expansion

Important dates

Study start
2023
Primary completion
2024
Study completion
2024
First posted
Sep 7, 2023
Registry last updated
May 8, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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