RecruitingNot Applicable

Feasibility Tests for Various Prism Configurations for Visual Field Loss

United States20 participantsStarted 2020-11-06

Plain-language summary

The investigators will develop and test different configurations of high-power prisms to expand the field of vision of patients with visual field loss to assist them with obstacle detection when walking. The study will involve multiple visits (typically four) to Schepens Eye Research Institute for fitting and testing with the prism glasses. The overall objective is to determine best designs and fitting parameters for implementation in prism devices for future clinical trials.

Who can participate

Age range

7 Years – 80 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

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)

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

Field of view expansion

Timeframe: Through study completion, an average of four months

Trial details

NCT IDNCT04424979

SponsorMassachusetts Eye and Ear Infirmary

Sponsor typeOTHER

Study typeINTERVENTIONAL

Primary completion2026-08

Contact for this trial

Alex Bowers

617 912 2512 alex_bowers@meei.harvard.edu

View on ClinicalTrials.gov More Hemianopia, Homonymous trials