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Can a $5 gift card or $100 drawing get more people to answer health surveys?

NCT ID NCT07755748

Knowledge-focused Sponsor: University of California, San Francisco Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Aug 10, 2026 · Last updated Sep 10, 2026 · Updated 3 times

Summary

This trial asks whether offering a small financial reward encourages more people to complete a follow-up telephone survey as part of a glaucoma screening program. About 2,000 participants will be randomly assigned to receive a $5 gift card, entry into a monthly $100 drawing, or no incentive. The goal is to see which approach, if any, improves survey completion rates among at-risk Californians.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Financial incentives: a $5 gift card or entry into a monthly $100 drawing
What this could lead to
If offering a small gift card or lottery entry boosts survey participation, it could help health programs collect better follow-up data from at-risk groups.
What could go wrong
This trial only tests survey response rates, not eye health outcomes. The incentives may not meaningfully improve participation, and results may not apply beyond this specific glaucoma screening program.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 2,000 people

The number the study aims to enrol. It can still change while the study runs.

Started

Feb 2026

Expected to finish

Sep 2029

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

50 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: \- Participating in GSEARCH trial Exclusion Criteria: \- Patients without a valid phone number

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Conditions

The condition(s) this trial relates to.

glaucoma

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Screening

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Baywell Health

    RECRUITING

    Oakland, California, 94607, United States

  • University of California, San Francisco

    ACTIVE_NOT_RECRUITING

    San Francisco, California, 94158, United States

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