Feasibility Tests for Various Prism Configurations for Visual Field Loss

Recruiting now · Not applicable

Conditions studied: Hemianopia, Homonymous, Tunnel Vision, Visual Field Defect, Peripheral, Visual Field Constriction Bilateral, Visual Field Defect Homonymous Bilateral

In brief

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.

Key facts

Study ID

NCT04424979

Run by

Massachusetts Eye and Ear Infirmary

People needed

20

Starts

2020-11-06

Expected to finish

2026-12-01

Last updated by the study team

2025-09-23

Who can join

Age: 7 and older, up to 80. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• 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

You may not qualify if…

• 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)

Where it is running

• Schepens Eye Research Institute — Boston, Massachusetts, United States (enrolling)

Full record on ClinicalTrials.gov

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