Concussion, BrainNCT05819489
A Comparison of Dynamic Vision Between College Athletes & Controls
An observational study of Concussion, Brain and Dynamic Vision Tests, run by California State University, Northridge at 1 site in United States.
Trial summary
The purpose of this study is to establish baseline reference values for tests of static and dynamic visual acuity and gaze stabilization in collegiate athletes and non-athletes, and to determine if there are differences in vision scores between collegiate athletes and non-athletes with and without a history of… Read more about this study
- Who is it for?
- Ages Up to 30 yearsHealthy volunteers can take part
- Conditions the study is for
- Concussion, Brain, Dynamic Vision Tests
- What is being tested?
- Dynamic Vision Testing
- How many people
- 145 participants
- Where
- 1 siteUnited States
- Study dates
- 31 Aug 2021to 15 May 2024
- Phase
- Observational
- Are there results?
- None posted in the registry
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 Up to 30 years
- All sexes
- Healthy volunteers accepted
- Child, Adult
Study population: Subjects were eligible to participate if they were currently enrolled DPT students, provided consent to participate, and were able to complete the testing protocol.
Who may be able to join
- Currently a California State University Northridge student
- Provide consent to participate Able to complete the testing protocol.
Who cannot join
- Unable to complete entirety of testing protocol.
- The subject is unable to attain a minimum of 85 degrees per second of horizontal head rotation when performing the DVA test.
Trial locations and contacts
1 site in 1 country.
United States1 site
California State University, Northridge, Jacaranda Hall 1578, 1576, 1574
Northridge, California, 91330-8411
About this study
The purpose of this study is to establish baseline reference values for tests of static and dynamic visual acuity and gaze stabilization in collegiate athletes and non-athletes, and to determine if there are differences in vision scores between collegiate athletes and non-athletes with and without a history of concussion.
Read the detailed description
An IRB-approved human subjects study (IRB-FY 20-339) was designed to investigate dynamic vision pre-and post-concussion in collegiate athletes. In addition to examining if there are changes in objective tests of dynamic vision after concussion, it is important to determine if there are baseline differences in dynamic vision objective tests when comparing collegiate athletes and similar-aged controls. Dynamic vision will be assessed through the administration of the Dynamic Visual Acuity (DVA) test and the Gaze Stabilization Test (GST). Baseline testing of GST and DVA is performed using the Bertec Vision Advantage TM system. Athletes are eligible to participate if they are currently enrolled students, actively participating on specified teams, provide consent to participate, and are able to complete the testing protocol. Non-athlete control subjects are students enrolled in a Doctor of Physical Therapy (DPT) program and serve as a sample of convenience.
- Conditions
- Concussion, Brain, Dynamic Vision Tests
- Being tested
- Dynamic Vision Testing
- Keywords
- Baseline Dynamic vision Testing
- Medical subject headings
- Brain Concussion
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Dynamic Vision TestingDiagnostic test
Also called DVA, GST
Dynamic Vision Acuity is tested with the Dynamic Vision Acuity (DVA) and Gaze Stabilization Test (GST) using the Bertec Vision Advantage System.
| Study group | Role | What they receive |
|---|---|---|
| Non-athlete college students with and without history of concussions | Non-athlete subjects included students currently enrolled in a Doctor of Physical Therapy (DPT) program served as a sample of convenience. Non-athlete subjects were excluded if they were over the age of 30 years old to minimize the effect of age in the data analysis. Receives: Diagnostic Test: Dynamic Vision Testing | |
| Students athletes with and without history of concussions | D1 student athletes currently enrolled in a large public university in the Los Angeles area. Subjects volunteered to participate in this study and currently competing in one of the following teams: Men's and Women's soccer, Men's and Women's basketball, Women's water polo or Men's volleyball. Athletes were eligible to participate if they were currently enrolled students, actively participating on the specified teams, provided consent to participate, and were able to complete the testing protocol. Receives: Diagnostic Test: Dynamic Vision Testing |
What is being measured
The primary outcome is the main question the study is designed to answer.
Dynamic Visual Acuity (DVA)
Subjects move their head at approximately 85 degrees per second per the standard test protocol. A metronome automatically generated by the computer assists in maintaining the correct head speed. When the sensor identifies 85 deg/sec, an optotype appears on the screen and the subject verbally identifies the optotype's orientation. This continues with progressively smaller sized letter until the athlete is no longer able to correctly identify the orientation. The computerized system uses a convergence algorithm to determine the accuracy of the response requiring 3 correct answers at the smallest letter size to assign a result. The computer then compares each subject's DVA score to their SVA, which is expressed a Log of minimal angle resolvable units (LogMAR). Simply, the computer considers the number of lines on an eye chart that are lost with head moving (DVA) compared to the head steady condition, known as static visual acuity (SVA)
Measured: August 31, 2021 - May 15, 2024
Secondary outcomes (2)
Gaze Stabilization Test (GST)
The subjects are asked to move their head in the horizontal plane and identify an optotype's orientation at increasing speeds. The optotype remains the same size while the head speed increases. A metronome is utilized to ensure correct head speeds which change throughout the test. When the subject reaches or exceeds the minimum threshold for velocity as measured by a wearable gyroscope attached to the forehead, the optotype appears on the screen for 75 ms, and the subject verbally identifies the direction of the optotype. The subject answers 3 of 5 trials correctly to confirm visual acuity for that velocity. The velocity of head movement begins very slowly (10 deg / second) and the rotational speed increases incrementally as long as the subject is asymptomatic and can see clearly. The test continues until the subject "fails", meaning the subject is unable to answer 3 of 5 trials correctly at a given velocity. The maximum head velocity is measured in degrees/second
Measured: August 31, 2021 - May 15, 2024
Static Visual Acuity (SVA) test
The SVA tests the subject's ability to see clearly with their head held still, similar to reading a Snellen eye chart. An optotype is briefly flashed on the screen and the subject is asked to correctly identify its orientation (which directing the capital "E" is facing) as it gets progressively smaller. Once the subject gives an inaccurate answer, the computer ends the test and provides their SVA baseline value based on the smallest optotype they could identify.
Measured: August 31, 2021 - May 15, 2024
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted19 Apr 2023
- Study start31 Aug 2021
- Primary completion15 May 2024
- Study completion15 May 2024
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Concussion, BrainStudies of the same condition, open and under way.
- 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
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 145 participants (actual)
Sponsor and investigators
- Lead sponsor
- California State University, Northridge
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Aimie Kachingwe, California State University, Northridge
- Investigators
- Aimie Kachingwe, Dr., Principal investigator, CSUNMargaret Roller, Dr., Principal investigator, CSUN
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05819489
- Sponsor's protocol ID
- IRB-FY23-271
- Status last verified
- Jul 2026
- First submitted
- 6 Apr 2023
- Last updated
- 10 Jul 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 10 Jul 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Comparison of Dynamic Vision Between College Athletes & Controls
- ClinicalTrials.gov ID
- NCT05819489
- Acronym / sponsor ID
- IRB-FY23-271
- Conditions
- Concussion, Brain, Dynamic Vision Tests
- Keywords
- Baseline Dynamic vision Testing
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 145 participants (actual)
- Lead sponsor
- California State University, NorthridgeUniversity, hospital or other
- Study start
- 31 Aug 2021 (actual)
- Primary completion
- 15 May 2024 (actual)
- Study completion
- 15 May 2024 (actual)
- First posted
- 19 Apr 2023 (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.
The purpose of this study is to establish baseline reference values for tests of static and dynamic visual acuity and gaze stabilization in collegiate athletes and non-athletes, and to determine if there are differences in vision scores between collegiate athletes and non-athletes with and without a history of concussion.
Detailed description
An IRB-approved human subjects study (IRB-FY 20-339) was designed to investigate dynamic vision pre-and post-concussion in collegiate athletes. In addition to examining if there are changes in objective tests of dynamic vision after concussion, it is important to determine if there are baseline differences in dynamic vision objective tests when comparing collegiate athletes and similar-aged controls. Dynamic vision will be assessed through the administration of the Dynamic Visual Acuity (DVA) test and the Gaze Stabilization Test (GST). Baseline testing of GST and DVA is performed using the Bertec Vision Advantage TM system. Athletes are eligible to participate if they are currently enrolled students, actively participating on specified teams, provide consent to participate, and are able to complete the testing protocol. Non-athlete control subjects are students enrolled in a Doctor of Physical Therapy (DPT) program and serve as a sample of convenience.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Non-athlete college students with and without history of concussions | – | Diagnostic Test: Dynamic Vision TestingNon-athlete subjects included students currently enrolled in a Doctor of Physical Therapy (DPT) program served as a sample of convenience. Non-athlete subjects were excluded if they were over the age of 30 years old to minimize the effect of age in the data analysis. |
| Students athletes with and without history of concussions | – | Diagnostic Test: Dynamic Vision TestingD1 student athletes currently enrolled in a large public university in the Los Angeles area. Subjects volunteered to participate in this study and currently competing in one of the following teams: Men's and Women's soccer, Men's and Women's basketball, Women's water polo or Men's volleyball. Athletes were eligible to participate if they were currently enrolled students, actively participating on the specified teams, provided consent to participate, and were able to complete the testing protocol. |
Who may qualify
- Ages
- Up to 30 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult
- Study population
- Subjects were eligible to participate if they were currently enrolled DPT students, provided consent to participate, and were able to complete the testing protocol.
Key inclusion criteria (2 listed)
- Currently a California State University Northridge student
- Provide consent to participate Able to complete the testing protocol.
Key exclusion criteria (2 listed)
- Unable to complete entirety of testing protocol.
- The subject is unable to attain a minimum of 85 degrees per second of horizontal head rotation when performing the DVA test.
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 |
|---|---|---|
| Dynamic Vision TestingAlso: DVA, GSTDynamic Vision Acuity is tested with the Dynamic Vision Acuity (DVA) and Gaze Stabilization Test (GST) using the Bertec Vision Advantage System. | Diagnostic test | Non-athlete college students with and without history of concussions, Students athletes with and without history of concussions |
Primary outcome
Dynamic Visual Acuity (DVA)
Time frame: August 31, 2021 - May 15, 2024
Subjects move their head at approximately 85 degrees per second per the standard test protocol. A metronome automatically generated by the computer assists in maintaining the correct head speed. When the sensor identifies 85 deg/sec, an optotype appears on the screen and the subject verbally identifies the optotype's orientation. This continues with progressively smaller sized letter until the athlete is no longer able to correctly identify the orientation. The computerized system uses a convergence algorithm to determine the accuracy of the response requiring 3 correct answers at the smallest letter size to assign a result. The computer then compares each subject's DVA score to their SVA, which is expressed a Log of minimal angle resolvable units (LogMAR). Simply, the computer considers the number of lines on an eye chart that are lost with head moving (DVA) compared to the head steady condition, known as static visual acuity (SVA)
2 secondary outcomes
Gaze Stabilization Test (GST)
Time frame: August 31, 2021 - May 15, 2024
Static Visual Acuity (SVA) test
Time frame: August 31, 2021 - May 15, 2024
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 10 Jul 2026.
- Individual participant dataSharing planned: No
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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. This study is not recruiting at the moment.
Aimie Kachingwe, Dr. principal investigator
CSUN
Margaret Roller, Dr. principal investigator
CSUN
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Concussion, Brain and Dynamic Vision Tests, run by California State University, Northridge at 1 site 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 2 inclusion and 2 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: finished, as of the sponsor's last update on 10 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site 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?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Dynamic Visual Acuity (DVA) (time frame: August 31, 2021 - May 15, 2024). 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 10 Jul 2026.