[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100395123":3},{"organization":4,"armGroups":7,"interventions":14,"overallOfficials":20,"centralContacts":25,"locations":31,"responsibleParty":46,"collaborators":50,"id":54,"slug":55,"hasResults":56,"nctId":57,"briefTitle":58,"officialTitle":59,"acronym":19,"eligibilityCriteria":60,"healthyVolunteers":56,"sex":61,"minAge":62,"maxAge":63,"enrollmentInfo":64,"targetDuration":19,"studyType":67,"phases":68,"briefSummary":70,"conditions":71,"keywords":77,"overallStatus":34,"whyStopped":19,"lastUpdateSubmitDate":83,"lastUpdatePostDateStruct":84,"startDateStruct":87,"completionDateStruct":89,"leadSponsor":91,"locationsCount":92},{"fullName":5,"class":6},"Massachusetts Eye and Ear Infirmary","OTHER",[8],{"label":9,"type":10,"description":11,"interventionNames":12},"High power prisms","EXPERIMENTAL","Various configurations of high power prisms will be developed for each individual and custom fit into spectacles lenses.",[13],"Device: High power prisms",[15],{"type":16,"name":9,"description":17,"armGroupLabels":18,"otherNames":19},"DEVICE","High power prisms designed to shift images from blind areas into portions of the wearer's remaining, seeing, field of vision",[9],null,[21],{"name":22,"affiliation":23,"role":24},"Eliezer Peli, MSc, OD","Schepens Eye Research Institute of Massachusetts Eye and Ear","STUDY_DIRECTOR",[26],{"name":27,"role":28,"phone":29,"phoneExt":19,"email":30},"Alex Bowers","CONTACT","617 912 2512","alex_bowers@meei.harvard.edu",[32],{"facility":33,"status":34,"city":35,"state":36,"zip":37,"country":38,"countryCode":39,"cosmosGeoPoint":40,"geoPoint":45,"contacts":19},"Schepens Eye Research Institute","RECRUITING","Boston","Massachusetts","02114","United States","US",{"type":41,"coordinates":42},"Point",[43,44],-71.05977,42.35843,{"lat":44,"lon":43},{"type":47,"investigatorFullName":48,"investigatorTitle":49,"investigatorAffiliation":5,"oldNameTitle":19,"oldOrganization":19},"PRINCIPAL_INVESTIGATOR","Alexandra Bowers","Associate Professor",[51],{"name":52,"class":53},"National Eye Institute (NEI)","NIH","100395123","feasibility-tests-for-various-prism-configurations-for-visual-field-loss-100395123",false,"NCT04424979","Feasibility Tests for Various Prism Configurations for Visual Field Loss","Visual Field Expansion Through Innovative Multi-Periscopic Prism Design","Inclusion Criteria:\n\n* Visual field loss, either peripheral field loss or hemianopic field loss\n* Visual acuity of at least 20\u002F50 in the better eye\n* In sufficiently good health to be able to complete sessions lasting 2-4 hours\n* Able to independently walk short distances\n* Able to give voluntary, informed consent\n* Able to speak English\n\nExclusion Criteria:\n\n* 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\n* A history of seizures in the last 6 months\n* Hemispatial neglect (subjects with hemianopic field loss only)","ALL","7 Years","80 Years",{"count":65,"type":66},20,"ESTIMATED","INTERVENTIONAL",[69],"NA","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.",[72,73,74,75,76],"Hemianopia, Homonymous","Tunnel Vision","Visual Field Defect, Peripheral","Visual Field Constriction Bilateral","Visual Field Defect Homonymous Bilateral",[78,79,80,81,82],"Visual field expansion","Prisms","Hemianopsia","Tunnel vision","Visual field loss","2025-09-22",{"date":85,"type":86},"2025-09-23","ACTUAL",{"date":88,"type":86},"2020-11-06",{"date":90,"type":66},"2026-12",{"name":5,"class":6},1]