Prism Glasses for Hemianopia

Recruiting in Palo Alto (17 mi)

+7 other locations

Overseen byEli Peli, OD MSc

Age: Any Age

Sex: Any

Travel: May Be Covered

Time Reimbursement: Varies

Trial Phase: Academic

Waitlist Available

Sponsor: Massachusetts Eye and Ear Infirmary

No Placebo Group

Trial Summary

What is the purpose of this trial?

This trial tests special glasses with powerful lenses to help people who have lost half of their vision on the same side in both eyes. The glasses work by bending light to expand their field of vision, making it easier to detect obstacles.

Research Team

Eli Peli, OD MSc

Principal Investigator

Schepens Eye Research Institute of Massachusetts Eye and Ear

Eligibility Criteria

This trial is for individuals with homonymous hemianopia, which means they've lost half of their field of vision in both eyes. Participants must have at least 20/50 vision with correction, a refractive error within -12D to +5D, and be able to walk independently. They should not have conditions like dementia or significant cognitive impairment that would affect mobility or the use of prism glasses.

Inclusion Criteria

I can walk on my own, even if I need a cane or walker.

Your vision prescription falls outside of -12D to +5D range.

I have had partial vision loss in both eyes for at least 6 months.

See 2 more

Exclusion Criteria

You have dementia.

You have difficulty paying attention to one side of your body or environment.

I have vision loss in part of my field of view due to an eye condition.

See 2 more

Treatment Details

Interventions

Fresnel Peripheral Prism (FPP) glasses (Optical Device)
Multi-Periscopic Prism (MPP) glasses (Optical Device)

Trial OverviewThe study is testing two types of prism glasses designed to expand the field of view: Multi-Periscopic Prism (MPP) glasses and Fresnel Peripheral Prism (FPP) glasses. The effectiveness of these glasses will be compared in helping patients navigate their environment.

Participant Groups

2Treatment groups

Experimental Treatment

Group I: MPP first, FPP secondExperimental Treatment2 Interventions

Participants in this arm will receive the MPP in the first period of the crossover and the FPP in the second period.

Group II: FPP first, MPP secondExperimental Treatment2 Interventions

Participants in this arm will receive the FPP in the first period of the crossover and the MPP in the second period.