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NCT Number: NCT07755748

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

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.

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Key information

Conditions

Screening Eye Diseases Glaucoma Ocular Hypertension

Age range

50 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Baywell Health, Oakland, California, United States

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About this study

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.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Participating in GSEARCH trial

Exclusion criteria

  • Patients without a valid phone number

Treatment and study plan

$5 gift card

Other

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

$100 monthly drawing

Other

Entry into monthly drawing for $100 gift card is offered as an incentive to participation in the 3-month survey call.

Primary outcomes

  1. Survey completion

    Time frame: One month after the outreach call is completed

Study contacts

Contact information is provided by the study sponsor or research team.

Dionna Wittberg, MPH

CONTACT

[email protected]

13306083016

Jeremy D Keenan, MD MPH

CONTACT

[email protected]

Sponsors and collaborators

Lead sponsor

University of California, San Francisco

Other

Collaborators

  • Centers for Disease Control and Prevention

Registry information

Acronym: GSearch-SRI

Important dates

Study start
2026
Primary completion
2027
Study completion
2028
First posted
Aug 10, 2026
Registry last updated
Aug 10, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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