Glaucoma Screening to Enhance At-Risk Californians' Health - Survey Response Incentives (GSearch-SRI)

September 8, 2026 updated by: University of California, San Francisco
This is a randomized trial to assess whether offering a financial incentive will improve the response rate to a telephone survey. Three incentive approaches will be compared: a $5 gift card, entry into a monthly $100 drawing, or no incentive.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

This is a sub-trial nested within a larger randomized trial called GSEARCH. The parent trial evaluates whether telemedicine glaucoma screening is more effective for detecting undiagnosed glaucoma cases compared with education alone or delayed intervention, with the final outcomes assessed via a follow-up telephone surveys at 3 months and 12 months. In this sub-study, we will assess whether adding an incentive improves the survey response completion rate. Participants enrolled in the parent GSEARCH trial will be eligible. Participants will be randomized to one of three incentive approaches, offered by telephone at the time of the follow-up survey ($5 gift card, entry into a monthly $100 drawing, or no incentive). The primary outcome will be completion of the telephone survey.

Study Type

Interventional

Enrollment (Estimated)

2000

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

  • United States
    • California
      • Oakland, California, United States, 94607
      • San Francisco, California, United States, 94158
        • Active, not recruiting
        • University of California, San Francisco

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

- Participating in GSEARCH trial

Exclusion Criteria:

- Patients without a valid phone number

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Screening
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: $5 gift card
Other: $5 gift card
A $5 gift card is offered as an incentive to participation in the 3-month survey call.
Active Comparator: $100 monthly drawing
Other: $100 monthly drawing
Entry into monthly drawing for $100 gift card is offered as an incentive to participation in the 3-month survey call.
No Intervention: No incentive
No incentive is offered for participation in the 3-month survey call.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Survey completion
Time Frame: One month after the outreach call is completed
One month after the outreach call is completed

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of California, San Francisco

Collaborators

Centers for Disease Control and Prevention

Investigators

  • Principal Investigator: Yvonne Ou, MD, University of California, San Francisco
  • Principal Investigator: Jeremy D Keenan, MD MPH, University of California, San Francisco

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

February 1, 2026

Primary Completion (Estimated)

January 31, 2029

Study Completion (Estimated)

September 30, 2029

Study Registration Dates

First Submitted

August 4, 2026

First Submitted That Met QC Criteria

August 4, 2026

First Posted (Actual)

August 10, 2026

Study Record Updates

Last Update Posted (Actual)

September 9, 2026

Last Update Submitted That Met QC Criteria

September 8, 2026

Last Verified

September 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • NCT06854198-2
  • 5U01DP006820-02 (U.S. NIH Grant/Contract)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

treatment arm, age, gender, survey completion

IPD Sharing Time Frame

After publication of the primary papers.

IPD Sharing Access Criteria

Researchers interested in accessing data from this project will submit requests to the investigators following instructions available at the repository. The study's co-PIs will approve requests with clear research questions and processes in place to ensure secure storage of images.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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