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NCT Number: NCT03475147

Smartphone Flicker Fusion Test for Patients With Optic Disorders.

The purpose of this project is to validate a quick, easy-to-use and administer smartphone flicker fusion test. The app (called eyeFusion) can potentially be used to easily and quickly collect critical flicker fusion measurements on patients admitted with optic disorders as part of the clinical care process.

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Key information

Conditions

Scotoma Eye Diseases Nervous System Diseases Neurologic Manifestations Pathological Conditions, Signs and Symptoms Sensation Disorders Signs and Symptoms Vision Disorders

Age range

18 year–80 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

University of Iowa

Iowa City, Iowa, 52240, United States

Location status: Recruiting

Location contact

Randy Kardon, MD, PhD

CONTACT

[email protected]

319-356-2260

About this study

The smartphone app developed is a flicker fusion that presents the subject with a series of stimuli consisting of a flickering pattern of bars above or below a static rectangle. For each stimulus presentation, the user has to tap the region that is flickering. The duration of the app is less than 2 minutes.

This study will assess the validity of the test construct in measuring flicker fusion thresholds, and serve as a foundation for further iterative designs of the app and future validation and characterization studies.

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

Control

  • Age matched 18-80 years of age.
  • Healthy normal controls with no known eye disorders.

Exclusion criteria

  • Scotoma or any other ocular disorder

Inclusion criteria

- Patients

  • Age 18-80
  • Clinically associated scotoma

Exclusion criteria

- Patients

-Any other ocular disorder

Treatment and study plan

eyeFusion

Device

Smartphone app based flicker fusion test.

Primary outcomes

  1. Assess Validity of the test construct measuring flicker fusion thresholds.

    Time frame: 1/1/2020

    The smartphone app developed is a flicker fusion that presents the subject with a series of stimuli consisting of a flickering pattern of bars above or below a static rectangle. The study will assess the validity of the test construct in measuring flicker fusion thresholds, and serve as a foundation for further iterative designs of the app and future validation and characterization studies.

Study contacts

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

Jan Full, BSN

CONTACT

[email protected]

319-356-8299

Julie K Nellis, BSN

CONTACT

[email protected]

319-356-2780

Sponsors and collaborators

Lead sponsor

Randy Kardon

Other

Registry information

Official study title

Validation of a Smartphone-Based Flicker Fusion Test

Important dates

Study start
2017
Primary completion
2028
Study completion
2028
First posted
Mar 23, 2018
Registry last updated
Nov 24, 2025

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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