Feasibility Tests for Various Prism Configurations for Visual Field Loss

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Mass Eye and Ear

Status

Enrolling

Conditions

Visual Field Defect Homonymous Bilateral
Visual Field Defect, Peripheral
Hemianopia, Homonymous
Tunnel Vision
Visual Field Constriction Bilateral

Treatments

Device: High power prisms

Study type

Interventional

Funder types

Other
NIH

Identifiers

NCT04424979
R01EY023385 (U.S. NIH Grant/Contract)
MPP_Feasibility1

Details and patient eligibility

About

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.

Enrollment

20 estimated patients

Sex

All

Ages

7 to 80 years old

Volunteers

No Healthy Volunteers

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)

Trial design

Primary purpose

Device Feasibility

Allocation

N/A

Interventional model

Single Group Assignment

Masking

None (Open label)

20 participants in 1 patient group

High power prisms
Experimental group
Description:
Various configurations of high power prisms will be developed for each individual and custom fit into spectacles lenses.
Treatment:
Device: High power prisms

Trial contacts and locations

1

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Central trial contact

Sailaja Manda; Alex Bowers, PhD

Data sourced from clinicaltrials.gov

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