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Test-retest Reliability of Two Measurements of the Visual System

NCT03242421 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 21

Last updated 2020-02-20

No results posted yet for this study

Summary

Binocular vision tests are guided by the principle that uniform motion and focus of the eyes may be trained, but exercising the simultaneous movement of the pupils is necessary and important in achieving optimal and lasting results (Horwood \& Toor, 2014). These tests have been in use for over 70 years and represent the foundation of therapy for visual deficiencies such as the inability of the eyes to move together. Despite their frequent use, no one has ever formally evaluated how good these tests are.

One such evaluation method is reliability. A reliable test is one that will give the same result when repeated on multiple occasions (i.e. test-retest reliability) or by different people (inter-rater reliability). An unreliable test gives widely varying results when repeated, which would make changes in a patient's test results difficult to interpret. Therefore, this study aims to determine the test-retest reliability of seven binocular vision tests across two independent measurements. The investigators will measure 20 healthy people ages 18 to 35 years for each of these tests on two separate occasions, one week apart. Since these tests have been in use for many years, we are expecting the two measurements to be within acceptable range of each other.

The tests being investigated measure: 3D vision (i.e. gross stereoscopic acuity), uniform movement of the eyes (i.e. "motor punctum proximum"), ability of the eyes to adapt to a target moving towards and/or away from the eyes (i.e. binocular fusion with convergence and divergence), quick movements of the eyes (i.e. saccadic movements), natural alignment of the eyes (i.e. anatomic oculomotor deviation), and double vision as a target is moved towards the eyes (i.e. convergence fusional proximum).

The results of each test will be analyzed individually. If the tests are perfectly reliable, we would expect the results of the first test to equal the results of the second test for each participant. To examine the test-retest reliability the difference between the first and second test for each individual and across all individuals' scores summed together will be assessed.

Conditions

  • Reproducibility of Results

Sponsors & Collaborators

Principal Investigators

  • Ian Shrier, MD, PhD · McGill University

Eligibility

Min Age
18 Years
Max Age
35 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2017-08-07
Primary Completion
2017-09-20
Completion
2017-09-20

Countries

  • Canada

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03242421 on ClinicalTrials.gov