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. Accommodative dysfunction after concussion is impaired ability to focus the eyes at near distance through crystalline lens changes, causing blurred near vision, delayed focus shifting, and eye strain (Silverberg et al., 2020). Accommodative dysfunction affects 40-60% of concussion patients. Types include accommodative insufficiency (reduced focusing power), accommodative infacility (slow focus shifting), accommodative excess (overfocused at near), and accommodative fatigue (loss of focus with sustained near work). Diagnosis includes accommodative amplitude testing, accommodative facility testing (with flippers), and accommodative lag testing. Treatment includes accommodative therapy exercises with accommodative flippers, near-far focusing exercises, and reading glasses for reduced accommodative amplitude. Neuro-optometric evaluation essential. Accommodative dysfunction affects 40-60% of concussions. Affects 40-60% of concussions. Four types of accommodative dysfunction. Four types. Neuro-optometric evaluation essential. Neuro-optometric evaluation essential. Normal Accommodation Ciliary muscle contraction thickens lens. Ciliary muscle contraction thickens lens. Lens thickening focuses at near distance. Lens thickening focuses at near distance. Ciliary muscle relaxation flattens lens. Ciliary muscle relaxation flattens lens. Lens flattening focuses at far distance. Lens flattening focuses at far distance. Cranial nerve III controls ciliary muscle. Cranial nerve III controls ciliary muscle. Parasympathetic system controls accommodation. Parasympathetic system controls accommodation. Accommodation-vergence coupling. Accommodation-vergence coupling. How Concussion Causes Accommodative Dysfunction Autonomic nervous system dysfunction. Autonomic nervous system dysfunction. Parasympathetic disruption. Parasympathetic disruption. Cranial nerve III dysfunction. Cranial nerve III dysfunction. Cortical accommodative control disruption. Cortical accommodative control disruption. Vergence-accommodation coupling disruption. Vergence-accommodation coupling disruption. Cerebellar involvement. Cerebellar involvement. Types of Accommodative Dysfunction Accommodative insufficiency (reduced power). Accommodative insufficiency reduced power. Accommodative infacility (slow shifting). Accommodative infacility slow shifting. Accommodative excess (overfocused near). Accommodative excess overfocused near. Accommodative fatigue (loss with sustained work). Accommodative fatigue loss with sustained work. Combined dysfunction common. Combined dysfunction common. Accommodative Insufficiency Reduced accommodative amplitude. Reduced accommodative amplitude. Blurred near vision. Blurred near vision. Difficulty reading close print. Difficulty reading close print. Eye strain with near work. Eye strain with near work. Headache with near work. Headache with near work. Premature presbyopia-like symptoms. Premature presbyopia-like symptoms. Reading glasses often helpful. Reading glasses often helpful. Accommodative Infacility Slow focus shifting between distances. Slow focus shifting between distances. Blur when looking from far to near. Blur when looking from far to near. Blur when looking from near to far. Blur when looking from near to far. Difficulty with tasks requiring rapid focus changes. Difficulty with rapid focus changes. Difficulty copying from board to paper. Difficulty copying from board to paper. Difficulty with sports involving focus changes. Difficulty with sports involving focus changes. Accommodative Excess Overfocused at near. Overfocused at near. Difficulty relaxing focus for far vision. Difficulty relaxing focus for far vision. Blurred far vision after near work. Blurred far vision after near work. Prolonged blur after reading. Prolonged blur after reading. Sometimes with associated convergence excess. Sometimes with associated convergence excess. Accommodative Fatigue Loss of focus with sustained near work. Loss of focus with sustained near work. Initial focus good. Initial focus good. Progressive blur over minutes. Progressive blur over minutes. Eye strain increases with time. Eye strain increases with time. Headache develops with prolonged near work. Headache develops with prolonged near work. Improvement with rest. Improvement with rest. Symptoms of Accommodative Dysfunction Blurred near vision. Blurred near vision. Delayed focus shifting. Delayed focus shifting. Blurred far vision after near work. Blurred far vision after near work. Eye strain. Eye strain. Headache with near work. Headache with near work. Reading difficulty. Reading difficulty. Screen intolerance. Screen intolerance. Difficulty copying from board. Difficulty copying from board. Fatigue with near work. Fatigue with near work. Diagnostic Testing Accommodative amplitude (push-up method). Accommodative amplitude push-up method. Accommodative facility (flippers). Accommodative facility flippers. Monocular accommodative facility. Monocular accommodative facility. Binocular accommodative facility. Binocular accommodative facility. Accommodative lag (MEM retinoscopy). Accommodative lag MEM retinoscopy. Accommodative response. Accommodative response. Cross cylinder testing. Cross cylinder testing. Normal Values Accommodative amplitude: 18 - (age/3) diopters. Accommodative amplitude formula. Accommodative facility: 11+ cycles per minute monocular. Facility 11+ CPM monocular. Binocular facility: 8+ cycles per minute. Binocular facility 8+ CPM. Accommodative lag normal: +0.25 to +0.75 diopters. Lag normal +0.25 to +0.75 D. Treatment Approach Accommodative therapy exercises. Accommodative therapy exercises. Accommodative flippers (+2.00/-2.00). Accommodative flippers. Near-far focusing exercises. Near-far focusing exercises. Hart chart accommodation. Hart chart accommodation. Computer-based accommodative training. Computer-based accommodative training. Reading glasses for insufficiency. Reading glasses for insufficiency. Home exercise program essential. Home exercise program essential. Prognosis Improvement within 8-12 weeks. Improvement within 8-12 weeks. Vision therapy resolves 70-85%. Vision therapy resolves 70-85%. Home program essential. Home program essential. Reading glasses supplement therapy. Reading glasses supplement therapy. Screen management supports recovery. Screen management supports recovery. Supporting Mobility Routine These exercises support accommodative 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 is accommodative dysfunction different from convergence insufficiency? Accommodative dysfunction involves focusing (crystalline lens function). Convergence insufficiency involves eye alignment (extraocular muscle function). Both cause similar symptoms (blur, eye strain, reading difficulty). Both often coexist after concussion. Accommodative flippers assess accommodation. Near point of convergence assesses convergence. Different treatments for each. Do I need reading glasses for accommodative dysfunction after concussion? Reading glasses can help accommodative insufficiency during vision therapy. Low-power reading glasses (+0.75 to +1.50) reduce accommodative demand at near. Temporary during rehabilitation. Not replacement for vision therapy. Discuss with neuro-optometrist. Some patients continue reading glasses after therapy. Not appropriate for accommodative excess. How do accommodative flippers work? Accommodative flippers are handheld device with +2.00 lens on one side and -2.00 lens on other side. Patient reads print through each lens alternately. Trains focus shifting and accommodative facility. Home exercise 5-10 minutes daily. Improves accommodative infacility. Assessed as cycles per minute completing near-far shifts. Can accommodative dysfunction resolve without treatment? Some mild accommodative dysfunction resolves spontaneously in first 4-6 weeks after concussion. Persistent accommodative dysfunction lasting beyond 4-6 weeks typically requires vision therapy for resolution. Untreated accommodative dysfunction contributes to persistent reading difficulty and screen intolerance. Vision therapy improves function 70-85% of the time. Should I see a regular optometrist for post-concussion accommodative dysfunction? Neuro-optometrist with vision therapy training preferred. Standard optometrist provides basic accommodative testing but often does not treat with vision therapy. Neuro-optometric evaluation with accommodative amplitude, facility, and lag testing supports diagnosis. Vision therapy for concussion is specialized skill requiring NORA or COVD training. 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