The Short Answer Educational content only. Any suspected concussion warrants medical evaluation. Consult vestibular-trained physical therapist, neuro-optometrist, or concussion specialist for individualized guidance. Convergence insufficiency (CI) after concussion is inability to converge the eyes properly at near distance, causing double vision, blurred vision, eye strain, and reading difficulty (Silverberg et al., 2020). CI affects 60-90% of concussion patients making it the most common post-concussion vision problem. Diagnosis measures near point of convergence (NPC) with normal values under 6 cm and abnormal values over 6 cm. Near point of convergence recovery measures ability to reestablish convergence with normal values under 8 cm and abnormal values over 8 cm. Treatment includes vergence therapy exercises (Brock string, pencil push-ups, vectograms, Wayne saccadic fixator) with 70-85% resolution rate. Convergence Insufficiency Treatment Trial (CITT) supports office-based vision therapy with home reinforcement. CI affects 60-90% of concussions. Affects 60-90% of concussions. Diagnosis measures near point of convergence. NPC measurement. Vergence therapy resolves 70-85%. Vergence therapy resolves 70-85%. Normal Convergence Physiology Eyes turn inward at near distance. Eyes turn inward at near. Both eyes fixate same near target. Both eyes fixate same near target. Single binocular vision maintained. Single binocular vision maintained. Accommodation-vergence coupling. Accommodation-vergence coupling. Extraocular muscle coordination. Extraocular muscle coordination. Cranial nerve III controls medial rectus. Cranial nerve III controls medial rectus. Cortical control coordinates vergence. Cortical control coordinates vergence. How Concussion Causes CI Cortical vergence control disruption. Cortical vergence control disruption. Brainstem convergence center injury. Brainstem convergence center injury. Cranial nerve III/VI dysfunction. Cranial nerve III/VI dysfunction. Vergence-accommodation coupling disruption. Vergence-accommodation coupling disruption. Cerebellar involvement. Cerebellar involvement. Occipital cortex processing changes. Occipital cortex processing changes. Symptoms of Convergence Insufficiency Double vision at near. Double vision at near. Blurred vision at near. Blurred vision at near. Eye strain (asthenopia). Eye strain asthenopia. Reading difficulty. Reading difficulty. Headache with near tasks. Headache with near tasks. Loss of place while reading. Loss of place while reading. Words moving or floating on page. Words moving or floating on page. Closing one eye to read. Closing one eye to read. Fatigue with reading. Fatigue with reading. Reduced reading comprehension. Reduced reading comprehension. Screen intolerance. Screen intolerance. Motion sickness with scrolling. Motion sickness with scrolling. Diagnostic Testing Near point of convergence (NPC) measurement. Near point of convergence NPC. NPC recovery measurement. NPC recovery measurement. Cover test at near. Cover test at near. Prism cover test. Prism cover test. Positive fusional vergence. Positive fusional vergence. Vergence facility. Vergence facility. Accommodative testing. Accommodative testing. Convergence Insufficiency Symptom Survey (CISS). Convergence Insufficiency Symptom Survey CISS. Normal vs Abnormal Values NPC normal under 6 cm. NPC normal under 6 cm. NPC abnormal over 6 cm. NPC abnormal over 6 cm. NPC recovery normal under 8 cm. NPC recovery normal under 8 cm. NPC recovery abnormal over 8 cm. NPC recovery abnormal over 8 cm. Positive fusional vergence normal 15+ prism diopters. Positive fusional vergence normal 15+ PD. Positive fusional vergence abnormal under 15 prism diopters. Positive fusional vergence abnormal under 15 PD. Treatment Approach Office-based vergence therapy. Office-based vergence therapy. Home exercise program essential. Home exercise program essential. Brock string exercise. Brock string exercise. Pencil push-ups. Pencil push-ups. Vectograms. Vectograms. Aperture rule. Aperture rule. Life saver cards. Life saver cards. Computer-based vergence therapy. Computer-based vergence therapy. Prism glasses (base-in for reading). Prism glasses base-in for reading. Convergence Insufficiency Treatment Trial (CITT) Office-based vision therapy most effective. Office-based vision therapy most effective. Home reinforcement essential. Home reinforcement essential. 12 weeks typical program. 12 weeks typical program. Weekly office sessions. Weekly office sessions. Daily home exercises. Daily home exercises. 75% symptom improvement in trial. 75% symptom improvement in trial. Pencil push-ups alone less effective. Pencil push-ups alone less effective. Brock String Exercise 10-foot string with three beads. 10-foot string with three beads. String held at nose. String held at nose. Focus on each bead. Focus on each bead. See two strings crossing at focused bead. See two strings crossing at focused bead. Alternate focus between beads. Alternate focus between beads. Home exercise 10-15 minutes daily. Home exercise 10-15 minutes daily. Progression to closer beads. Progression to closer beads. Prism Lenses Base-in prism for near work. Base-in prism for near work. Reduces vergence demand. Reduces vergence demand. Temporary during rehabilitation. Temporary during rehabilitation. Bifocal prism glasses possible. Bifocal prism glasses possible. Reduces symptoms while therapy progresses. Reduces symptoms while therapy progresses. Prognosis 70-85% resolution with dedicated program. 70-85% resolution with dedicated program. 12-16 weeks typical duration. 12-16 weeks typical duration. Home program essential for progress. Home program essential for progress. Recurrence possible. Recurrence possible. Maintenance exercises help. Maintenance exercises help. Supporting Mobility Routine These exercises support convergence therapy through cervical mobility and nervous system regulation. JME 155 Diaphragmatic breathing supports vagal tone and parasympathetic regulation during concussion recovery. 10 breaths every 60-90 minutes. JME 14 Chin tucks reduce upper cervical tension common in concussion injury. 10 repetitions with 5-second holds. JME 1 Cervical rotation supports cerebral blood flow and nervous system regulation. 10 repetitions each direction. JME 150 Thoracic rotation restores breathing depth shallow during concussion recovery. 8 repetitions per direction. Start your 3-day free trial for joint-specific mobility programs that support nervous system regulation through concussion recovery. How do I know if I have convergence insufficiency after concussion? Symptoms of double vision, blurred vision, eye strain, and reading difficulty at near distance suggest CI. Near point of convergence testing measures NPC. NPC over 6 cm indicates CI. NPC recovery over 8 cm indicates CI. Convergence Insufficiency Symptom Survey (CISS) supports diagnosis. Neuro-optometric evaluation confirms diagnosis. How long does convergence therapy take for post-concussion CI? Convergence therapy typically 12-16 weeks. Weekly office-based vision therapy sessions with daily home exercise program. Improvement often noticed within 4-6 weeks. Complete resolution 12-16 weeks. CITT trial showed 75% symptom improvement at 12 weeks. Complex cases 16-24 weeks. Do pencil push-ups work for convergence insufficiency? Pencil push-ups alone less effective than office-based vision therapy with home reinforcement per CITT trial. Home pencil push-ups appropriate as supplement to office-based therapy. Not adequate as sole treatment. Office-based vergence therapy with home exercises 75% effective. Pencil push-ups alone approximately 35% effective. Do I need prism glasses for convergence insufficiency after concussion? Prism glasses can help manage CI symptoms during vision therapy. Base-in prism reduces vergence demand at near. Temporary during rehabilitation. Not replacement for vision therapy. Discuss with neuro-optometrist. Some patients continue prism after therapy. Prism glasses help function during recovery. Can convergence insufficiency recur after treatment? Yes, CI can recur particularly after new head injury, illness, or period of reduced eye use. Maintenance exercises reduce recurrence risk. Regular follow-up with neuro-optometrist. Home exercise program continued after treatment. New concussion can worsen previously treated CI. Return to vision therapy if symptoms return. References Patricios, J. S., et al. (2023). Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport, Amsterdam, October 2022. British Journal of Sports Medicine, 57(11), 695-711. PubMed Silverberg, N. D., et al. (2020). Management of concussion and mild traumatic brain injury: a synthesis of practice guidelines. Archives of Physical Medicine and Rehabilitation, 101(2), 382-393. PubMed