What is a Concussion?

It is estimated that 4-5 million concussions occur annually, making a concussion the most common type of traumatic brain injury.

A concussion is a type of traumatic brain injury that changes the way your brain functions.  The vast majority of concussions do NOT result in a loss of consciousness, making diagnosis more challenging than previously thought.  The majority of concussions result by blunt trauma, or a blow to the head.  In children, the most common cause of concussions is sports, specifically contact sports such as football, soccer, lacrosse, and hockey.  Concussions can also be caused by violent shaking of the head or upper body, so direct contact in the form of a "bump of the head" or "getting your bell rung" is not required to cause a concussion.  In adults, motor vehicle accidents and falls are the most common causes of concussions.

Facts About Concussions
Fewer than 10% of sports-related concussions have associated loss of consciousness.

A review article published in Pediatrics in 2010 has helped to dispel the myth that a loss of consciousness, or “blacking out”, is a required component of a concussion.

Having had one concussion makes you more susceptible to another

The increased risk of repeat concussions is one of the several reasons why the decision to return to play should be made with the athlete’s health care team.

Car accidents and falls are the most common cause of concussions in adults

Seemingly mild “bumps on the head” can have drastic neurological effects.  These neurological effects can in turn affect the visual system, making daily tasks such as reading or driving extremely difficult (if not impossible).

Symptoms of a Concussion
There are several symptoms of a concussion.  Some are physical symptoms (such as a headache or vision problems), while others are cognitive (feeling in a fog or visual perceptual challenges), others are emotional, and others can affect sleep.  The multitude and variability of concussion symptoms make medical evaluation very important following a concussion.
Concussion Symptoms at Advanced Vision Therapy Center Boise Idaho
Visual Effects of a Concussion

67% of the neural connections within the brain are involved with some aspect of vision, whether it is visual input, visual perception, or visual integration.  With so many of the connections within the brain involved with the process of vision, it is no wonder that vision problems are so common following an acquired brain injury.

There are several potential visual side effects of a concussion that are consistent with other forms of mild traumatic brain injury (mTBI).  Some of these may improve with time, others may be unchanging, while others respond very well to active treatment.

Concussions can have the following effects on the visual system:

Accommodative Insufficiency – This condition is a reduction in eye focusing ability that results in blurry vision at near, even in young athletes.  Near vision may be constantly blurry or may pulse in and out of clarity during near activities like reading.

Blurry Vision - Blurry vision following a concussion can occur at distance, near, or both.

Convergence Insufficiency – This inability to use the eyes comfortably at near can result in a number of symptoms including: headaches, eyestrain, fatigue, or even double vision during near activities.

Double Vision – There are several causes of double vision, which is why anyone who sees double (even intermittently) should be evaluated by an optometrist with advanced training in neuro-optometry, binocular vision, and vision therapy.

Light Sensitivity – Photophobia, or light sensitivity, can result from various types of acquired brain injuries (including concussions).

Ocular-Motor Dysfunction – Deficiencies in eye movement abilities are quite common following concussions and other forms of mild traumatic brain injuries.  These eye movement deficits can pose challenges with many activities of daily life, including reading and driving.

Reduced Cognitive Abilities With Visual Tasks - Visual perceptual deficits can be caused by concussions and have dramatic effects on academic and even athletic success.

Reduced Visual Processing Speed or Reaction Time – Prolonged visual processing speed can slow down an athlete both on and off the field.  The speed with which an athlete processes visual information affects many aspects of athletic competition, including: reading the field of play, judging the speed of a moving ball or puck, and judging the speed of other players on the field.

Post-Concussion Testing
The visual and visual perceptual effects of a mild traumatic brain injury, such as a concussion, have been well known for quite some time.  This is why ImPACT concussion testing has included so many visual perceptual components to the testing protocol.  Some of the areas of visual perception that are assessed using the ImPACT system include:
  • Design discrimination
  • Non-verbal problem solving
  • Selective attention time
  • Visual attention span
  • Visual working memory
  • Visual processing speed
  • Visual reaction time
  • Visual recognition memory
While ImPACT testing does a great job of measuring many components of visual perception, it is not equipped to assess the effects on the visual system that will result in headaches, eyestrain, double vision, blurry vision, or reading difficulties.  For this reason, any athlete who has suffered a concussion and has noticed a change in vision, balance, academic success, or overall comfort should have a neuro-optometric assessment with an optometrist who has received advanced training in neuro-optometry and binocular vision.
Dr. Ryan Johnson is Idaho’s only optometrist who has received residency training in neuro-optometry, binocular vision, and vision therapy. During a Neuro-Optometric Assessment, he evaluates the following areas of your visual system:
  • Visual acuity (clarity of vision)
  • Refractive error (presciption)
  • Visual field (the extent of your peripheral/side vision)
  • Fusion (the brain’s ability to simultaneously perceive information from each eye at the same time)
  • Eye movements
  • Accommodation (eye focusing)
  • Vergence (eye teaming)
  • Visual perceptual skills
  • Visual processing speed
  • Visual integration
  • Working memory
Concussion Management: The Visual Component

Many of the visual conditions that result from a concussion can be successfully managed by a doctor with both knowledge and experience in the areas of neuro-optometry, binocular vision, and vision therapy.

Following a Neuro-Optometric Assessment, our residency-trained neuro-optometrist will determine if glasses, contact lenses, vision therapy, or a combination of treatments is best to address your visual conditions.

The good news is that some of the most common visual effects of mild traumatic brain injury (accommodative insufficiency, convergence insufficiency, and ocular motor dysfunction) are all conditions that respond to vision therapy.

Advanced Vision Therapy Center works as part of a multidisciplinary team to help athletes from Boise, Meridian, Nampa, Caldwell, Eagle, Kuna, Mountain Home, and other areas of Idaho.

Call 208.377.1310 to schedule your Neuro-Optometric Assessment with Advanced Vision Therapy Center

Improvement Starts Here

With over 25 years of proven success, you can trust Advanced Vision Therapy Center to provide the care you need.

Our Clinical Director is Idaho's only residency trained optometrist in vision therapy and neuro-optometry and is a Fellow of the American Academy of Optometry.  His residency at University of California, Berkeley means he has the expertise and experience to treat even the most complex cases.

Read what our patients have to say.

  Vision therapy can be a bit unfamiliar to some people. We are going to begin this blog by discussing briefly when vision therapy is used. Many visual conditions can be effectively treated and managed with prescription glasses or contact lenses. However, for other visual conditions (convergence insufficiency, binocular vision dysfunction, etc) prescription glasses or contact lenses cannot correct the vision problem. It is in these cases that vision therapy may be prescribed.   ... Read More
  Many people are unaware of the differences between an optometrist, a neuro-optometrist, and a behavioral or developmental optometrist. Sure, they sound alike but the services they provide are quite different. And if you, or someone you know, has a vision problem that cannot be corrected with glasses or contact lenses this blog is for you.   ... Read More
  At Advanced Vision Therapy Center our results speak for themselves. Jonah, however, wanted to share his story with you. We invite you to watch this short video to learn more about Jonah's experience and success.   ... Read More
  It's a dangerous world we live in today! With October upon us, people are thinking about spooky, creepy crawly things, and of course things that go bump in the night. Most ghoul hunters know that to protect themselves from the evil lurking in the shadows this time of year, they need the necessities such as garlic, silver bullets, a cross...you know, for protection.     ... Read More
  Traumatic Brain Injury (TBI) is a term used within the medical community to describe an injury to the brain which is not hereditary, congenital or degenerative. Traumatic Brain Injury can be result from a blow to the head, whiplash, seizure disorders, tumors, stroke, toxic exposure, or infectious diseases to name a few. The incidence of prevalence of brain injury outnumbers breast cancer, spinal cord injury, multiple sclerosis and HIV/AIDs combined.   ... Read More
  Many people have heard of vision therapy, but don't know a lot about it. As with any type of therapy, the effectiveness of the program is dependent upon several factors. It is advisable to ask questions and do your homework. Vision therapy programs vary greatly from provider to provider.   ... Read More
  Everyday in our schools students are presented with information that they are required to look at, interpret, and process that information. For years it was believed that the eyes had nothing to do with learning. That is definitely not the case. Did you know it is estimated that 80% of what we learn is through visual information?     ... Read More
  Convergence Insufficiency (CI) is a common eye-teaming problem which occurs when the eyes are unable to maintain the ocular posture necessary for reading or near tasks. Convergence Insufficiency results from misalignment of the eyes when focusing on up close, such as when reading. The eyes have a strong tendency to drift outward when reading or doing close up work. The exact cause is unknown.    ... Read More
  After this abnormally tedious Boise winter, we are all ready to get outside and play in the sun! Hold on though, before you rush outside, have you taken the necessary precautions to protect yourself for ultraviolet rays? There are three types of ultraviolet rays, these wavelengths are not visible to the human eye and are shorter than violet wavelengths of light.    ... Read More
  Whether you are playing sports as a hobby or competitively there is a lot to consider. Are you using proper form? Is your equipment up to date? Are you warmed up? Are you wearing the appropriate safety gear? Is your opponent looking bigger and stronger than last time? Seriously, did he grow six inches? Whatever your thought process or preparation is you may be missing a key step. Are you wearing your protective eye-wear?   ... Read More
Contact Us

7960 W. Rifleman Street, #155
Boise , Idaho , 83704 USA
Phone:  208-377-1310
Fax:  208-321-1952