Feasibility Tests for Various Prism Configurations for Visual Field Loss

Last updated: April 3, 2025
Sponsor: Massachusetts Eye and Ear Infirmary
Overall Status: Active - Recruiting

Phase

N/A

Condition

Vision Loss

Blurred Vision

Treatment

High power prisms

Clinical Study ID

NCT04424979
MPP_Feasibility1
R01EY023385
  • Ages 7-80
  • All Genders

Study 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

Inclusion

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

Exclusion Criteria:

  • Any physical or mental impairments, including cognitive dysfunction, balanceproblems or other deficits that could impair the ability to walk or use the prismspectacles

  • A history of seizures in the last 6 months

  • Hemispatial neglect (subjects with hemianopic field loss only)

Study Design

Total Participants: 20
Treatment Group(s): 1
Primary Treatment: High power prisms
Phase:
Study Start date:
November 06, 2020
Estimated Completion Date:
August 31, 2025

Connect with a study center

  • Schepens Eye Research Institute

    Boston, Massachusetts 02114
    United States

    Active - Recruiting

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