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Prism

Prism Glasses for Visual Field Loss

N/A
Recruiting
Led By Eliezer Peli, MSc, OD
Research Sponsored by Massachusetts Eye and Ear Infirmary
Eligibility Criteria Checklist
Specific guidelines that determine who can or cannot participate in a clinical trial
Must have
Able to independently walk short distances
Visual field loss, either peripheral field loss or hemianopic field loss
Must not have
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
Timeline
Screening 3 weeks
Treatment Varies
Follow Up through study completion, an average of four months
Awards & highlights
No Placebo-Only Group

Summary

This trial will help develop better prism glasses for people with visual field loss, to assist with obstacle detection while walking.

Who is the study for?
This trial is for people with certain types of visual field loss, like tunnel vision or hemianopia. Participants must have at least 20/50 vision in their better eye, be able to walk on their own, speak English, and complete sessions up to 4 hours. It's not for those with recent seizures, balance issues that affect walking, cognitive problems, or hemispatial neglect.
What is being tested?
The study tests various high-power prism configurations designed to widen the visual field and help detect obstacles while walking. Participants will visit Schepens Eye Research Institute multiple times for fitting/testing these new prism glasses to find the best designs for future use.
What are the potential side effects?
While specific side effects are not detailed here as it's a feasibility test rather than a drug trial, participants may experience discomfort or disorientation when adjusting to the new prism glasses.

Eligibility Criteria

Inclusion Criteria

You may be eligible if you check “Yes” for the criteria below
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I can walk on my own for short distances.
Select...
I have lost some of my field of vision.

Exclusion Criteria

You may be eligible for the trial if you check “No” for criteria below:
Select...
I do not have any physical or mental conditions that would stop me from walking or using special glasses.
Select...
I have had a seizure in the past 6 months.

Timeline

Screening ~ 3 weeks
Treatment ~ Varies
Follow Up ~through study completion, an average of four months
This trial's timeline: 3 weeks for screening, Varies for treatment, and through study completion, an average of four months for reporting.

Treatment Details

Study Objectives

Study objectives can provide a clearer picture of what you can expect from a treatment.
Primary study objectives
Field of view expansion
Secondary study objectives
Pedestrian detection rate

Awards & Highlights

No Placebo-Only Group
All patients enrolled in this study will receive some form of active treatment.

Trial Design

1Treatment groups
Experimental Treatment
Group I: High power prismsExperimental Treatment1 Intervention
Various configurations of high power prisms will be developed for each individual and custom fit into spectacles lenses.

Find a Location

Who is running the clinical trial?

Massachusetts Eye and Ear InfirmaryLead Sponsor
108 Previous Clinical Trials
13,014 Total Patients Enrolled
National Eye Institute (NEI)NIH
553 Previous Clinical Trials
1,407,148 Total Patients Enrolled
Eliezer Peli, MSc, ODPrincipal Investigator - Schepens Eye Research Institute of Massachusetts Eye and Ear
Massachusetts Eye and Ear Infirmary

Media Library

High power prisms (Prism) Clinical Trial Eligibility Overview. Trial Name: NCT04424979 — N/A
Visual Field Loss Research Study Groups: High power prisms
Visual Field Loss Clinical Trial 2023: High power prisms Highlights & Side Effects. Trial Name: NCT04424979 — N/A
High power prisms (Prism) 2023 Treatment Timeline for Medical Study. Trial Name: NCT04424979 — N/A
Visual Field Loss Patient Testimony for trial: Trial Name: NCT04424979 — N/A
~4 spots leftby Nov 2025
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