Visual Dysfunction in Mild Traumatic Brain Injury (MTBI): A Comparison Group Study (VDMTBI)

This study has been completed.
Information provided by (Responsible Party):
Department of Veterans Affairs Identifier:
First received: April 30, 2008
Last updated: January 24, 2013
Last verified: August 2009

In an on-going study of visual characteristics of personnel diagnosed with a mild traumatic brain injury (MTBI) related to their service in Iraq and Afghanistan we found a high rate of binocular vision problems (such as double/blurry vision, reading difficult, etc.). These individuals are also usually diagnosed with post traumatic stress disorder (PTSD). PTSD is known to cause some vision symptoms. We wish to conduct this study on individuals with PTSD (but not an MTBI) to see if they have symptoms similar to those in individuals who have MTBI. This will provide us with information useful in determining the specific cause of the visual symptoms in the MTBI population.

Post-Traumatic Stress Disorder

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Prospective
Official Title: Visual Dysfunction in MTBI: A Comparison Group Study

Resource links provided by NLM:

Further study details as provided by Department of Veterans Affairs:

Primary Outcome Measures:
  • Presence or absence of binocular dysfunction [ Time Frame: The primary outcome will be measured at a single visual screen lasting approximately one hour. ] [ Designated as safety issue: No ]

Estimated Enrollment: 75
Study Start Date: October 2008
Study Completion Date: August 2009
Primary Completion Date: July 2009 (Final data collection date for primary outcome measure)
Group 1
Participants will be patients diagnosed with PTSD but with no history of TBI. Participants must be between the ages of 19 and 39. Participants must be compentent to sign a consent form and be willing ot participate in a vision screening.

Detailed Description:

We will recruit 75 patients diagnosed with PTSD, but with no history of mild traumatic brain injury (MTBI), from the population of the VAPAHCS PTSD Center and Clinics. These volunteers will be scheduled for an eye screening developed for a concurrent project to assess visual dysfunction (accommodation/vergence insufficiency, pursuit/saccade deficits, etc.) in patients diagnosed with MTBI and seen at the Palo Alto Polytrauma Network Site clinic. The MTBI patients have unexpectedly high rates of binocular dysfunction, although their visual acuities and visual fields are normal/near normal. The MTBI diagnosis is associated with a combat blast event in some 90% of cases. Th majority of this population has also been diagnosed with PTSD. PTSD is known to cause some visual symptoms, thus it is necessary for us to determine if the visual dysfunctions in the MTBI are related to their PTSD diagnosis or not. The volunteer participants will be scheduled for an eye screening and consented prior to the screening. Inclusion criteria include diagnosis of PTSD, aged 19 to 39, and willingness to participate. Exclusion criteria is primarily history of TBI. The visual screen includes assessments of visual acuity, visual field, self-reported visual function (i.e., light sensitivity, eye fatigue, reading difficulty), and measures of accommodative function, vergence, pursuit and saccades. The data collected will be compared to the data from the ongoing study of visual dysfunction in patients diagnosed with MTBI.


Ages Eligible for Study:   19 Years to 39 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population

Participants will be drawn from the patient population of the VAPAHCS PTSD Center and Clinics.


Inclusion Criteria:

  • diagnosis of PTSD
  • no history of MTBI
  • between 19 and 39 years of age
  • a veteran

Exclusion Criteria:

  • a history of MTBI
  • over the age of 39
  • an unwillingness to participate
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00671450

United States, California
VA Palo Alto Health Care System
Palo Alto, California, United States, 94304-1290
Sponsors and Collaborators
Principal Investigator: Gregory L Goodrich, PhD VA Palo Alto Health Care System
  More Information

No publications provided

Responsible Party: Department of Veterans Affairs Identifier: NCT00671450     History of Changes
Other Study ID Numbers: SHP 08-142
Study First Received: April 30, 2008
Last Updated: January 24, 2013
Health Authority: United States: Federal Government

Additional relevant MeSH terms:
Stress Disorders, Post-Traumatic
Stress Disorders, Traumatic
Vision Disorders
Anxiety Disorders
Eye Diseases
Mental Disorders
Nervous System Diseases
Neurologic Manifestations
Sensation Disorders
Signs and Symptoms processed this record on October 22, 2014