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Prism glasses could help half-blind patients spot dangers

NCT ID NCT04827147

Symptom relief Sponsor: Massachusetts Eye and Ear Infirmary Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Aug 20, 2026 · Updated 2 times

Summary

This study tests two types of high-power prism glasses designed to expand the field of view for people with homonymous hemianopia, a condition where the same half of vision is missing in both eyes. About 64 participants will use the glasses while walking in a virtual reality simulation to see if they can better detect approaching hazards from their blind side. The goal is to improve safety and independence in daily life.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

64 people

The number who actually took part.

Started

Apr 2023

Finished

Apr 2026

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

7 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Homonymous hemianopia with or without macular sparing for at least 3 months * Visual acuity of at least 20/50 in each eye, with correction if needed * Refractive error in the -12D to +5D range * Able to walk independently, using a cane or walker if needed * Able to communicate in English sufficiently to understand the study procedures and how to use the prisms Exclusion Criteria: * Central visual field loss in the seeing hemifield of either eye (e.g. from macular degeneration, glaucoma, diabetic retinopathy or other maculopathies) * Hemi-spatial neglect * Significant cognitive impairment * Dementia * Any other physical or mental disabilities, or general health problems that could impair the ability to be independently mobile (i.e., walk ), participate in the VR walking simulator test or use the prism glasses

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Conditions

The condition(s) this trial relates to.

Hemianopsia

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Homonymous hemianopia

Contacts and locations

Locations

  • Illinois College of Optometry

    Chicago, Illinois, 60616, United States

  • New England College of Optometry

    Boston, Massachusetts, 02215, United States

  • Schepens Eye Research Institute

    Boston, Massachusetts, 02114, United States

  • The Eye and Vision Center at MCPHS

    Worcester, Massachusetts, 01608, United States

  • UAB Center for Low Vision Rehabilitation, Callahan Eye Hospital

    Birmingham, Alabama, 35233, United States

  • UCHealth Sue Anschutz-Rodgers Eye Center

    Denver, Colorado, 80045, United States

  • UMass Chan Medical School

    Worcester, Massachusetts, 01655, United States

  • Visual Health and Surgical Center

    Palm Springs, Florida, 33461, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.