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New prism glasses could help people with tunnel vision see more

NCT ID NCT04424979

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 study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Jun 26, 2026

Summary

This study tests special glasses with high-power prisms that shift images from blind spots into the wearer's remaining vision. Researchers will try different designs to see which best expands the field of view and helps people detect obstacles while walking. The trial involves about 20 participants with conditions like hemianopia or tunnel vision, who will attend several sessions for fitting and testing.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
high-power prism glasses
What this could lead to
If successful, these glasses could help people with tunnel vision or hemianopia see more of their surroundings and avoid obstacles while walking.
What could go wrong
This is a small, early-stage trial with only 20 participants, testing different designs. The glasses may not work well for everyone or in real-world conditions.

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

About 20 people

The number the study aims to enrol. It can still change while the study runs.

Started

Nov 2020

Expected to finish

Dec 2026

An estimate. End dates often move.

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 to 80 years

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: * Visual field loss, either peripheral field loss or hemianopic field loss * Visual acuity of at least 20/50 in the better eye * In sufficiently good health to be able to complete sessions lasting 2-4 hours * Able to independently walk short distances * Able to give voluntary, informed consent * Able to speak English Exclusion Criteria: * Any physical or mental impairments, including cognitive dysfunction, balance problems or other deficits that could impair the ability to walk or use the prism spectacles * A history of seizures in the last 6 months * Hemispatial neglect (subjects with hemianopic field loss only)

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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.

Hemianopia, homonymous Tunnel vision Visual field constriction bilateral Visual field defect homonymous bilateral Visual field defect, peripheral

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Schepens Eye Research Institute

    RECRUITING

    Boston, Massachusetts, 02114, United States

More trials for these conditions

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