Diagnostic Innovations in Glaucoma Study (DIGS)

July 2, 2021 updated by: Linda Zangwill, University of California, San Diego

The overarching goal of our research study is to evaluate changes in visual function and optic nerve topography (the structure of the back of the eye) in patients with glaucoma (increased susceptibility to pressure inside the eye that can cause loss of vision) or those with an increased risk of developing the disease. The purpose of this study is to determine the best methods for detecting the presence or progression (worsening over time) of glaucoma in patients with and without myopia and its effects on daily and visual function and quality of life. With several sources of NIH and foundation funding over the last twenty years we have designed a robust research protocol to address the most challenging aspects of glaucoma management. The most recent focus of this research is 1) to improve our ability to detect open angle glaucoma in individuals with myopia and in individuals of European and African descent, 2) to determine whether monitoring of the retinal vasculature with new optical imaging instruments can improve glaucoma management and elucidate the pathophysiology of the disease, and 3) to differentiate between age-related changes and glaucomatous progression.

The grants supporting this project include 3 NIH funded studies, 1) the University of California, San Diego UCSD -based "Diagnostic Innovations in Glaucoma Study" (DIGS funded since 1995): 2) the "African Descent and Glaucoma Evaluation Study" (ADAGES funded since 2002), 3) the Brightfocus Foundation National Glaucoma Research Program and 4) the UCSD-based "Diagnosis and Monitoring of Glaucoma with Optical Coherence Tomography Angiography" (funded since 2018). The ADAGES is a multi-center study with data collection also conducted at 2 other academic sites, the University of Alabama at Birmingham, and Columbia University.

Enrolled healthy participants, glaucoma suspects and glaucoma patients are generally asked to return for two or more visits a year for several years. We then analyze whether the glaucoma patients are progressing and what factors influence their glaucoma status compared to healthy subjects and individuals suspected of having glaucoma.

Study Overview

Status

Recruiting

Conditions

Detailed Description

The Diagnostic Innovation in Glaucoma Study (DIGS) and ADAGES are longitudinal studies in which participants with or without myopia are examined approximately biannually, in most cases. Healthy controls with or without myopia are examined once, in most cases. The ADAGES recruitment and testing of individuals of African descent is an independently funded multi-center (including UCSD, Columbia University, and University of Alabama, Birmingham) study, which follows the same study protocol as the DIGS to ensure that the data from both studies can be analyzed together. This harmonization of protocols leverages the advantages of both DIGS by increasing the sample sizes to address the unique hypotheses of each study.

All participants must be 18 years old or older. Participants with or without myopia will be required to have at least one eye with open angles, best corrected visual acuity of 20/40 or better to be included. Participants taking a medication known to affect visual field sensitivity and eyes with a history of intraocular surgery (except uncomplicated glaucoma and cataract surgery), a secondary cause of elevated intraocular pressure, a coexisting intraocular disease affecting visual field, or a problem other than glaucoma affecting color vision may be excluded.

Most of the extensive testing completed for these visits can be considered standard of care, but for clinical care all tests are not generally all done at the same patient visit with the variety of instruments included in this research project. The following tests can be considered standard of care: medical history, blood pressure and heart rate, height and weight, visual acuity testing near acuity testing, low contrast sensitivity testing, slit lamp biomicroscopy (including gonioscopy), measurements of intraocular pressure with contact and non-contact tonometry, corneal thickness measurement (pachymetry), corneal elasticity measured using non-contact tonometry, interocular axial length, corneal curvature, anterior chamber depth measurements (all measured using intraocular lens IOL master), dilated fundoscopy, stereoscopic ophthalmoscopy of the optic disc with a 78 D lens, color vision testing, standard automated perimetry, optical coherence tomography (OCT) and photography.

There is currently no end date to the study, as the follow-up will continue as long as the research is supported.

The time involved is usually 2-4 visits per year of approximately 2-5 hours each.

DIGS Positional Study Subjects will also be given the opportunity to participate in the following additional auxiliary study. The DIGS Positional Study will allow subjects to participate in an ancillary study. Participation in this ancillary study includes imaging of the eyes using Optical Coherence Tomography (OCT) and Optical Coherence Tomography Angiography (OCT-A), as well as measurement of intraocular pressure (IOP) and blood pressure (BP) in sitting and supine positions. No invasive procedures or treatments will be administered. We will be using the standard clinically available software as well as investigational software available for research purposes. The investigational software has been deemed safe by the manufacturer of the device and does not pose any additional risks to patients. Since not every glaucoma patient has high eye pressure (low-tension glaucoma) or has pressure controlled with medication use (so that the untreated eye pressure is now known), glaucoma subjects using intraocular pressure lowering medication and with IOP < 25 mm Hg may be requested to stop their medication for 1 to 3 weeks, by the treating ophthalmologist depending on the class of medication, before being imaged. Risks are small and include IOP elevation. However, glaucoma progression is on the order of months to years, and not days. Subjects will resume using the medication after the research visit is completed.

Study Type

Observational

Enrollment (Anticipated)

3000

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 Locations

  • United States
    • California
      • La Jolla, California, United States, 92093-0946
        • Recruiting
        • UCSD, Hamilton Glaucoma Center
        • Contact:
        • Principal Investigator:
          • Linda M Zangwill, PhD
        • Principal Investigator:
          • Robert N Weinreb, MD
        • Sub-Investigator:
          • Christopher Bowd, PhD
        • Principal Investigator:
          • Andrew Camp, MD

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

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Adults

Description

Inclusion:

  • Subjects are healthy controls with or without myopia, and patients with or without myopia with a diagnosis of glaucoma, glaucoma suspect and ocular hypertension
  • They will be considered if they are above 18 years old.
  • There is no upper age limit
  • Subject are not restricted by gender, race or ethnicity.

Exclusion:

-Participants with other ocular or systemic conditions and treatment, which may affect visual function, are excluded.

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

Cohorts and Interventions

Group / Cohort
Healthy individuals
healthy controls with or without myopia
Persons at risk for or with primary open angle glaucoma
with or without myopia with a diagnosis of glaucoma, glaucoma suspect and ocular hypertension

Collaborators and Investigators

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

Sponsor

University of California, San Diego

Collaborators

National Eye Institute (NEI)

Investigators

  • Principal Investigator: Linda Zangwill, PhD, University of California, San Diego

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

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

April 1, 1995

Primary Completion (Anticipated)

July 1, 2022

Study Completion (Anticipated)

July 1, 2022

Study Registration Dates

First Submitted

September 14, 2005

First Submitted That Met QC Criteria

September 14, 2005

First Posted (Estimate)

September 22, 2005

Study Record Updates

Last Update Posted (Actual)

July 6, 2021

Last Update Submitted That Met QC Criteria

July 2, 2021

Last Verified

July 1, 2021

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • EY08208; EY11008, EY027510
  • R01EY027510 (U.S. NIH Grant/Contract)

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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