NCT04424979NARecruiting
Feasibility Tests for Various Prism Configurations for Visual Field Loss
Massachusetts Eye and Ear Infirmary
Start Date
11/6/2020
Completion Date
12/1/2026
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.
Eligibility Criteria
Age Range: 7 years to 80 years
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)
Interventions
DEVICE
High power prisms
Conditions
Hemianopia, HomonymousTunnel VisionVisual Field Defect, PeripheralVisual Field Constriction BilateralVisual Field Defect Homonymous Bilateral
Locations
Schepens Eye Research Institute
Boston, Massachusetts 02114
United States