ScreeningGSearch-SRINCT07755748
Glaucoma Screening to Enhance At-Risk Californians' Health - Survey Response Incentives
A study testing $5 gift card and $100 monthly drawing in people with Screening, run by University of California, San Francisco at 2 sites in United States.
Trial 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. Read more about this study
- Who is it for?
- Ages 50 years and older
- Conditions the study is for
- Screening
- What is being tested?
- $5 gift card and $100 monthly drawing
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 2,000 participants
- Where
- 2 sitesUnited States
- Study dates
- 1 Feb 2026to 30 Sep 2029
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 50 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Participating in GSEARCH trial
Who cannot join
- Patients without a valid phone number
Trial locations and contacts
2 sites in 1 country. Contact the study team or a site near you to ask about taking part.
Jeremy D Keenan, MD MPH contact
United States2 sites, 1 recruiting
- Recruiting
Baywell Health
Oakland, California, 94607
Angela Shahbazian, OD, FAAO, 510-835-9610, a.shahbazian@berkeley.edu
- Active, not recruiting
University of California, San Francisco
San Francisco, California, 94158
About this study
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.
Read the 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.
- Conditions
- Screening
- Being tested
- $5 gift card, $100 monthly drawing
- Keywords
- Screening, Response rate, incentive, glaucoma
- Medical subject headings
- Glaucoma
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
$5 gift cardOther
A $5 gift card is offered as an incentive to participation in the 3-month survey call.
$100 monthly drawingOther
Entry into monthly drawing for $100 gift card is offered as an incentive to participation in the 3-month survey call.
| Study group | Role | What they receive |
|---|---|---|
| $5 gift card | Experimental | Not described Receives: Other: $5 gift card |
| $100 monthly drawing | Active comparator | Not described Receives: Other: $100 monthly drawing |
| No incentive | No intervention | No incentive is offered for participation in the 3-month survey call. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Survey completion
Measured: One month after the outreach call is completed
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted10 Aug 2026
- Study start1 Feb 2026
- Primary completion31 Jan 2029 (estimated)
- Study completion30 Sep 2029 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for ScreeningStudies of the same condition, open and under way.
- More trials run by University of California, San FranciscoThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Screening
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 2,000 participants (estimated)
Sponsor and investigators
- Lead sponsor
- University of California, San Francisco
- Sponsor type
- University, hospital or other
- Collaborators
- Centers for Disease Control and Prevention
- Responsible party
- Sponsor
- Investigators
- Jeremy D Keenan, MD MPH, Principal investigator, University of California, San FranciscoYvonne Ou, MD, Principal investigator, University of California, San Francisco
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07755748
- Sponsor's protocol ID
- NCT06854198-2
- Other IDs
- 5U01DP006820-02
- Acronym
- GSearch-SRI
- Status last verified
- Sep 2026
- First submitted
- 4 Aug 2026
- Last updated
- 9 Sep 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes: treatment arm, age, gender, survey completion
Study at a glance
From the registry record, last updated by the sponsor on 9 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Glaucoma Screening to Enhance At-Risk Californians' Health - Survey Response Incentives
- ClinicalTrials.gov ID
- NCT07755748
- Acronym / sponsor ID
- GSearch-SRI / NCT06854198-2
- Conditions
- Screening
- Keywords
- Screening, Response rate, incentive, glaucoma
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 2,000 participants (estimated)
- Lead sponsor
- University of California, San FranciscoUniversity, hospital or other
- Collaborators
- Centers for Disease Control and Prevention
- Study start
- 1 Feb 2026 (actual)
- Primary completion
- 31 Jan 2029 (estimated)
- Study completion
- 30 Sep 2029 (estimated)
- First posted
- 10 Aug 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Study design
- Primary purpose
- Screening
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| $5 gift card | Experimental | Other: $5 gift card |
| $100 monthly drawing | Active comparator | Other: $100 monthly drawing |
| No incentive | No intervention | –No incentive is offered for participation in the 3-month survey call. |
Who may qualify
- Ages
- 50 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (1 listed)
- Participating in GSEARCH trial
Key exclusion criteria (1 listed)
- Patients without a valid phone number
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| $5 gift cardA $5 gift card is offered as an incentive to participation in the 3-month survey call. | Other | $5 gift card |
| $100 monthly drawingEntry into monthly drawing for $100 gift card is offered as an incentive to participation in the 3-month survey call. | Other | $100 monthly drawing |
Primary outcome
Survey completion
Time frame: One month after the outreach call is completed
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 9 Sep 2026.
- Individual participant dataSharing planned: Yes. treatment arm, age, gender, survey completion
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Jeremy D Keenan, MD MPH contact
Jeremy D Keenan, MD MPH principal investigator
University of California, San Francisco
Yvonne Ou, MD principal investigator
University of California, San Francisco
2 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing $5 gift card and $100 monthly drawing in people with Screening, run by University of California, San Francisco at 2 sites in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 9 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 2 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Dionna Wittberg, MPH (13306083016, dionna.wittberg@ucsf.edu), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Survey completion (time frame: One month after the outreach call is completed). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 9 Sep 2026.