An interventional study of High power prisms in Hemianopia, Homonymous, Tunnel Vision and Visual Field Defect, Peripheral, sponsored by Massachusetts Eye and Ear Infirmary. Completed at 1 site in United States. Open to participants aged 7 Years to 80 Years. Per ClinicalTrials.gov, last updated 2026-10-06.
Sponsored by Massachusetts Eye and Ear Infirmary · Not applicable, Interventional, and Device feasibility
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.
63 studies on the registry are indexed under Hemianopsia; 24 are open to participants now.
This study's enrollment of 10 is below the median of 32 across 53 interventional studies indexed under Hemianopsia.
Browse Hemianopsia studies →Massachusetts Eye and Ear Infirmary is the lead sponsor of 100 studies on the registry; 23 are open to participants now.
Of its 13 completed or terminated interventional studies of FDA-regulated products, 7 (54%) have results posted.
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Exclusion Criteria:
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You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Various configurations of high power prisms will be developed for each individual and custom fit into spectacles lenses.
Device: High power prisms
High power prisms designed to shift images from blind areas into portions of the wearer's remaining, seeing, field of vision
Field of view expansion
Horizontal and vertical extent of the expansion (in degrees) of the field of view
Time frame: Through study completion, an average of four months
Pedestrian detection rate
Proportion of pedestrians detected (in simulated walking or simulated driving)
Time frame: Through study completion, an average of four months
Plan to share: No
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
This study is completed, as verified in Oct 2026. You cannot join it, but the record below documents what was studied.
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