Using Critical Flicker Fusion to Distinguish Causes of Vision Loss


  • Study type

  • Study IDs

  • Describes the nature of a clinical study. Types include:

    • Observational study — observes people and measures outcomes without affecting results.
    • Interventional study (clinical trial) — studies new tests, treatments, drugs, surgical procedures or devices.
    • Medical records research — uses historical information collected from medical records of large groups of people to study how diseases progress and which treatments and surgeries work best.
  • Site IRB
    • Rochester, Minnesota: 14-009007
    Sponsor Protocol Number: 14-009007

About this study

The goal of this study is to evaluate the efficacy of the critical flicker fusion device in distinguishing different kinds of optic neuropathy. 

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. If you need assistance understanding the eligibility criteria, please contact the study team.

See eligibility criteria

Inclusion Criteria:

  • Patients 18 years or older with visual acuity between 20/20 and 20/200.

Exclusion Criteria: 

  • Subjects with high standard deviation on the testing, which indicates unreliable results

Participating Mayo Clinic locations

Study statuses change often. Please contact us for help.

Mayo Clinic Location Status Contact

Rochester, Minn.

Mayo Clinic principal investigator

John Chen, M.D., Ph.D.

Contact us for the latest status

Contact information:

John Chen M.D., Ph.D.



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