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Glaucoma Screening to Enhance At-Risk Californians' Health - Survey Response Incentives

Glaucoma Screening to Enhance At-Risk Californians' Health - Survey Response Incentives

Status
Recruiting
Phases
Unknown
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07755748
Acronym
GSearch-SRI
Enrollment
2000
Registered
2026-08-10
Start date
2026-02-01
Completion date
2029-09-30
Last updated
2026-09-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Screening

Keywords

Screening, Response rate, incentive, glaucoma

Brief summary

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.

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.

Interventions

OTHER$5 gift card

A $5 gift card is offered as an incentive to participation in the 3-month survey call.

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.

Sponsors

University of California, San Francisco
Lead SponsorOTHER
Centers for Disease Control and Prevention
CollaboratorFED

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
SCREENING
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
50 Years to No maximum
Healthy volunteers
No

Inclusion criteria

\- Participating in GSEARCH trial

Exclusion criteria

\- Patients without a valid phone number

Design outcomes

Primary

MeasureTime frame
Survey completionOne month after the outreach call is completed

Countries

United States

Contacts

CONTACTDionna Wittberg, MPH
dionna.wittberg@ucsf.edu13306083016
CONTACTJeremy D Keenan, MD MPH
jeremy.keenan@ucsf.edu
PRINCIPAL_INVESTIGATORJeremy D Keenan, MD MPH

University of California, San Francisco

PRINCIPAL_INVESTIGATORYvonne Ou, MD

University of California, San Francisco

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Sep 10, 2026