Oculomotor Therapy for TBI: A Look at the Latest Evidence on Restitutive Interventions

Hey colleague, it's Aly. Let's grab a virtual coffee and chat about the eyes. We've all seen it: the post-concussion patient who's technically 'recovered' but still struggles with headaches during screen time, dizziness in busy environments, or just feeling 'off.' More often than not, their oculomotor system is a key part of the puzzle. Up to 85% of individuals with mild traumatic brain injury (mTBI) experience oculomotor deficits, so it's a massive area of need for our patients. A new systematic review and meta-analysis published in March 2024 by Biscardi and colleagues took a deep dive into what they call 'restitutive' interventions. This is our bread and butter: therapy aimed at restoring normal function through repetitive training of a compromised eye movement. They sifted through over 5,000 studies to synthesize the evidence on these active therapies for adults with mTBI. Let's break down what they found and what it means for us in the clinic. First, the big picture. The review included 12 studies with a total of 354 participants. The interventions covered a range of familiar territory: vergence (like pencil push-ups and computerized vergence training), saccades (think Hart charts and computerized programs), and smooth pursuit exercises. The meta-analysis revealed a positive trend toward improvement in oculomotor function and visual tasks across the board. Patients got better. However, and this is a big 'however,' the authors graded the overall certainty of the evidence as low. This was due to a high risk of bias in the included studies, most of which were case series or crossover designs without robust control groups. So, while we can be encouraged, we can't be definitive just yet. Let's get into the nitty-gritty of the interventions. For convergence insufficiency, a common finding post-mTBI, the therapies looked at included both office-based and home-based programs. For example, one protocol involved a 6-week, twice-weekly program of 60-minute sessions. These sessions included a mix of computer-based and traditional exercises focusing on vergence, accommodation, and saccades. Patients in these studies showed significant improvements in their Near Point of Convergence (NPC) and on the Convergence Insufficiency Symptom Survey (CISS). For example, one study reported an average improvement in CISS score from 38.5 to 15.6 after a 12-week intervention. That's a clinically meaningful change that can drastically improve a patient's ability to read and work. For saccadic dysfunction, the interventions often involved computerized training programs. These programs challenge the patient to perform rapid, accurate eye movements to peripheral targets. One study protocol used a 6-week program with patients performing the exercises for 15-20 minutes per day, 5 days a week. The results showed improvements in saccadic accuracy and speed, which translates to more efficient reading and better ability to scan a dynamic environment. The key here is the high repetition and progressive difficulty. Smooth pursuit exercises were also commonly included, often as part of a comprehensive vision therapy program. These exercises train the eyes to follow a moving target smoothly and accurately. While the review didn't isolate the effects of smooth pursuit training alone, its inclusion in successful multi-component programs suggests it's a valuable part of the rehabilitation process, helping to improve gaze stability and reduce symptoms like dizziness. So, how do we apply this in the clinic? The evidence suggests a multi-modal, individualized approach is best. Patient selection is key. These interventions are most appropriate for patients with persistent symptoms (e.g., beyond 4 weeks post-injury) and objectively identified oculomotor deficits in vergence, saccades, or pursuits. A thorough assessment, including NPC, pursuits and saccades testing, and a symptom survey like the CISS, is a non-negotiable first step. Contraindications are few but important: be cautious with patients who have a history of strabismus not related to the TBI or active, severe vestibular dysfunction that needs to be addressed first to avoid exacerbating their symptoms. The dosing parameters from the review provide a starting point. A general guideline could be 1-2 supervised sessions per week for 6-12 weeks, supplemented with daily home exercises for 15-20 minutes. The key is to monitor symptoms closely. We need to operate in that sweet spot below the symptom exacerbation threshold. If a patient's headache or dizziness spikes during an exercise, we need to regress the difficulty, reduce the duration, or switch the activity. Ultimately, this review confirms that active, restitutive vision therapy is a promising and likely beneficial treatment for our mTBI patients. While we wait for higher-quality research with randomized controlled trials to strengthen the evidence base, we have enough of a signal to act. By using a careful, assessment-driven, and symptom-guided approach, we can help our patients overcome these debilitating visual symptoms and get back to their lives.