Vision Rehabilitation and Hemianopia · VT improves Vergence and Accommodation in Adults with mTBI...
Transcript of Vision Rehabilitation and Hemianopia · VT improves Vergence and Accommodation in Adults with mTBI...
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Vision and ABI:
A Rehabilitation ApproachTanya Polonenko, OD, FAAO, FCOVD
Lisa Griffiths, ABI patient & ABI MomNovember 7, 2019
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I see, I see
Tanya Polonenko, practitioner
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I see, I see
Lisa Griffiths,
living with ABI
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It’s not what you look at that matters,
It’s what you see ~ Henry David Thoreau
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Lecture Outline
▪ What is Vision?
▪ Vision and ABI
▪ Symptoms of inefficient vision
▪ Vision Rehabilitation
▪ Neuroplasticity
▪ Goals and Improvements
▪ Sample Exercises
▪ Does it work?
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A: Vision is the ability to make a
meaningful interpretation of what is
seen.
Q: What is vision?
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We need to gather and interpret visual information.
Vision requires more than having 20/20
eyesight.
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There is so much more to vision than meets the eye.
How are you supposed to read this easily if it is
moving around or going blurry?
There is so much more to vision than meets the eye.
How are you supposed to read this easily if it is
moving around or going blurry?
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How does ABI affect vision?
70% of our
brain is involved
with vision
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- John Streff, O.D.
“When vision is working well, it guides and
leads in all that we do; when not, it interferes.”
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Visual functional skills:“how info gets into the brain”
These skills determine the speed, accuracy, endurance and
comfort of gathering visual information:
Eye Focusing (Accommodation)
Eye Teaming (Binocularity)
Eye Tracking (Ocular Motility)
Visual-Vestibular Interaction
Visual FieldAiming/Aligning
(Fixation)
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Visual perceptual skills:“what the brain does with visual info”
Visual Discrimination
Visual Memory
Spatial Relations
Form Constancy
Figure Ground Visual Closure
Visual-Motor Integration
Directionality/
Laterality
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The mind-eye connection
What do I do about it?
What is it? Focusing, following
Targets
Where is it? Aiming, scanning space
Background
When is it? Time judgement
context
Who am I?▪ How do I feel about it?
▪ Attention to detail
▪ Intentional movement
▪ Awareness of context
▪ Habitual/anticipatory
movement
Where am I?▪ Electrical signals
How Am I?▪ Chemical signals
MIND
BODY
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The OBIA Impact Report 2012 https://www.ontario.ca/img/[email protected]
Politzer, T. (2015, April 22) Introduction to Vision and Brain Injury. Retrieved from Neuro-Optometric Rehabilitation
Association website https://nora.cc/for-patients-mainmenu-34/vision-a-brain-injury-mainmenu-64.html
26-50% of those with ABI reported trouble with
their vision most of the time.
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Reduced ability to use vision
Either:
Vision getting to the brain
Brain processing visual info
…or both
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The visual component to post concussion
syndrome
Post Trauma Vision Syndrome
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Post Traumatic Vision Syndrome
Blur (sometimes intermittent)
Trouble focusing
Double vision
Eye strain/fatigue
Headaches
Difficulty tracking
Slow visuomotor performance
Difficulties with balance and posture
Glare sensitivity and photophobia
Accommodative dysfunction
Vergence issues / misalignment
Oculomotor abnormalities
Visual field defects
Perception deficits
Visual inattention (Neglect)
Perceived visual midline shift
Visual-vestibular
Dry eye
Symptoms Deficits
Kapoor N, Ciuffreda KJ. Vision Disturbances Following Traumatic Brain Injury.
Current Treatment Options in Neurology. 2002:4: 271-280
Ciuffreda KJ et al. Occurrence of oculomotor dysfunction in acquired brain
injury: A retrospective analysis. Optometry. 2007:78(4): 155-161.
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Behavioural Implications to Vision
Fatigue
Reduced confidence
Anxiety & uncertainty
Passive in decision making
Difficulty with dynamic environments
Fear of falling
Community activities become challenging: Driving
Shopping
Working
Sports, leisure interests
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Accommodation
How well our eyes can change its focus for different distances
Ability
Flexibility
Sustained over time
Symptoms
Headache
Blurred vision
Eye strain
Fatigue
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Vergence
How well the eyes are working together as a team
Symptoms:
Double vision
Eyestrain
Depth perception struggles
Clumsiness
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Vergence
Coping Mechanisms
Falls asleep while reading
Avoids visual tasks
Squints
Closes an eye
Nausea/dizziness
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Oculomotor
There are many areas of the
brain needed for tracking:• Control of
saccades and pursuits
Cerebral
• Horizontal and Vertical Gaze Centers
Brainstem
• Control of eye muscles
Cranial Nuclei
• Execute the eye movements
Extra-ocular Muscles
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Associated Symptoms
Reading difficulties:
Slower reading speed
Loss of place / skipping lines
Missing words
Poor comprehension
Print seems to move / swim / jumble
Nausea / dizziness
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Oculomotor and Vestibular Systems
Vision integrates with balance through the Vestibular
Ocular Reflex (VOR)
Keeps vision stable when you are moving
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Associated Symptoms
Imbalance and sensitivity to visually-stimulating
environments
Grocery stores
Malls
Restaurants
Dizziness/Nausea/Vertigo with visual tasks
TV
Reading, computer
Driving
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Visual Field Loss in ABI
Vision loss in 32-65% of ABI
May occur due to damage to the
eye, optic nerve, or brain
stroke
Cerebral Hemorrhage
Head Trauma
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Implications of Visual Field Loss
Missing Information
More time needed
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Visual Midline Shift Syndrome
Abnormal Egocentric Localization
Deviated perception of visual midline
Poor eye/hand coordination
Postural changes
Diminished ability to navigate environment
Houston K E. Measuring visual midline shift syndrome & disorders of
spatial localization: A literature review & report of a new clinical
protocol. J Behav Optom. 2010:21(4): 87-93.
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Visual Information Processing
Prognosis guarded with
severe ABI
Goal of therapy:
create strategies that
maximize performance
Strategies:
Auditory strategies
repetition
different viewing perspectives
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Photosensitivity
Elevated sensitivity to lights
Dark and light adaptation problems
Tints/Filters beneficial
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Treatment Options
http://www.algaecal.com/wp-content/uploads/options-treatment-guidelines-of-osteoporosis.jpg
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Treatment: Vision
Balanced Prescription
Glasses or Contact Lenses
Filters
Yoked prism
Occlusion
Vision Therapy
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What is Vision Rehabilitation?
An individualized treatment regimen prescribed to a patient in order to:
Provide medically necessary treatment to normalize diagnosed visual dysfunctions◼ Vergence
◼ Accommodation
◼ Oculomotor
Improve visual comfort, ease, efficiency, and processing
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Neuroplasticity and Therapy
Brain (visual system) is able to create new connections
and fortify old ones by experience
Learning and plasticity can occur by myelination
formation or re-modeling white matter
Neurogenesis continues throughout lifetime
1-4
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Goals of Vision Therapy
Alleviate signs and symptoms
Achieve desired visual outcomes
Improve quality of life
Return to daily activities
5-26
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Improvements to Expect
Oculomotor Skills Accuracy and speed
Span of recognition
Reduced re-fixations and regressions while reading
Vergence & Accommodation Ability, speed, flexibility
Quality and stability of vision
Reduced symptoms
Comfort Efficiency Accuracy Performance
5-26
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Managing Expectations
Rehabilitation is a process that takes time
Initially can cause exacerbated symptoms
Manage the increased symptoms while
strength training
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General Therapy Sequence
• Awareness
Phase 1
• Monocular
Phase 2
• Bi-ocular
Phase 3
• Binocular
Phase 4• Integration
• Flexibility
• Stamina
Phase 5
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Eye Focusing Training
Train by using lenses or changing distances
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Eye Teaming Training
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Space matching
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Scanning
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Scanning
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Scanning
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Scanning
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Scanning
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Visual-Spatial Organization
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Yoked Prism
More efficient information processing
Influences plasticity of multi-sensory integration processes and cognitive processes related to mental representation of visual space (Rode 2001)
Alters body posture
Changes center of gravity
Improve higher cognitive levels
Assists in judging distance and stabilization
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Life Therapy
Meal Times Prep
Eating arrangement
Navigation Walk, maps
Website
Recreational Virtual Reality
Board Games
Bocce Ball
Mini Golf
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DOES IT WORK?
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VT improves Vergence and Accommodation
in Adults with mTBI
12 non-strabismic individuals with mTBI and diagnosed vergence and accommodative disorders participated
6 weeks (2 sessions/wk, 3 hours each); half did oculomotor training (OMT) and half did placebo (P) training
Results:
Improved amplitude and peak velocity of
vergence (pfv and nvf)
accommodation (monocular and binocular)
Improved stereoacuity
Improved visual attention
Reduced near symptoms (CISS score)
No change in patients that did placebo VT
Thiagarajan P, Ciuffreda KJ. Effect of oculomotor rehabilitation on vergence responsivity in mild traumatic brain injury. J Rehabil Res Dev. 2013: 50(9): 1223-40.
Thiagarajan P, Ciuffreda KJ. Effect of oculomotor rehabilitation on accommodative responsivity in mild traumatic brain injury. J Rehabil Res Dev. 2014; 51(2): 175-92.
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VT improves eye movements,
reading rate, visual attention
12 subjects with mTBI participated in either oculomotor training (OMT) or sham training (ST).
6 weeks, 2 sessions a week. Trained vergence, accommodation, version in randomized order across sessions.
Visual attention assessed by VSAT
Results:
Over 80% of abnormal parameters significantly improved
Reading rate improved
Amplitudes of vergence, accommodation improved
Saccadic eye movements improved in rhythmicity and accuracy
Improved visual attention and CISS score
Thiagarajan P, el al. Oculomotor neurorehabilitation for reading in mild traumatic brain injury (TBI): An integrative approach. NeuroRehabilitation. 2014. 34: 129-146.
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VT improves eye movements
and reading ability
5 adults with stroke and 9 adults with TBI
8 weeks of training, 2 sessions/week
Training included single- and multiple-line simulated reading, as well as basic versional tracking (fixation, saccade, and pursuit) using infra-red eye movement recording technology
Internal oculomotor visual feedback in isolation (4 weeks) or concurrent with external oculomotor auditory feedback (4 weeks)
Results:
Improved objective accuracy with versional tracking
Improved reading ability
Ciuffreda KJ, et al. Oculomotor rehabilitation for reading in acquired brain injury.NeuroRehabilitation. 2006. 21: 9-21.
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VT improves clinical and fMRI measures
in Adults with CI
13 control normal BV adults; 4 convergence insufficiency adults
All participated in 18 hours of VT
Results: Reduction in NPC and NPC recovery point
Reduction in Near Phoria
Improved PFV, average peak velocity of convergence
Significant increased functional activity within the frontal areas, cerebellum, and brain stem significantly
Alvarez TL, et al. Vision Therapy in Adults with Convergence Insufficiency: Clinical and fMRI Measures. Optom Vis Sci. 2010; 87(12): E985–1002.
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fMRI shows brain changes with vergence
training
Functional activity and vergence eye movements were quantified from 7 BV normal and 4 CI patients before and after 18 h of vergence training.
Results: CI patient measurements after vergence training were more similar to levels observed with BV normal Increased fMRI activity levels
Increased speed in convergence response
Improvement in CISS score
Alvarez TL et al. Functional activity within the frontal eye fields, posterior parietal cortex, and cerebellar vermis significantly correlates to symmetrical vergence peak velocity: an ROI-based, fMRI study of vergence training. Front. Integr. Neurosci., 2014; http://dx.doi.org/10.3389/fnint.2014.00050
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Vergence peak velocity and phoria
improves with VT
12 BV normal patients and 4 CI patients. CI patients underwent 18 hours of VT.
Results: After VT, peak velocity and exophoria magnitude improved significantly in CI patients
Alvarez TL. A pilot study of disparity vergence and near dissociated phoria in convergence insufficiency patients before vs. after vergence therapy. Front. Hum. Neurosci.2015; http://dx.doi.org/10.3389/fnhum.2015.00419
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Professional team collaboration
Family Physician
Occupational Therapist
Physical Therapist
Speech and Language Therapist
Case manager
Psychologist
Classroom Teacher and
TutorsWorkplace
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Referral Process
Can book directly for
• ABI Exam
• MVA Exam
Medical history is helpful
385 Fairway Rd S, Unit 202
Kitchener, ON
Phone: (519) 208-2040
Fax: (519) 208-2045
Email: [email protected]
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Summary
ABI can impact many aspects of vision
The brain is neuroplastic
Research shows VT improves vision function & quality of life
In-office VT is most effective; at-home is an option
ABI is multi-faceted and benefits from a health team
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References
Bolognini, N et al (2005). Visual search improvement in hemianopic patients after audio-visual stimulation. Brain. 128:2830-2842
Bowers AR el al (2012). Clinical study: A pilot evaluation of on-road detection performance by drivers with hemianopia using oblique peripheral prisms. Stroke Research and Treatment Volume 2012, Article ID 176806, 10 pages. doi:10.1155/2012/176806
Ciuffreda KJ (2002). The scientific basis for and efficacy of optometric vision therapy in nonstrabismic accommodative and vergence disorders. Optometry. 73: 735-62.
Ciuffreda KJ et al. (2007) Occurrence of oculomotor dysfunction in acquired brain injury: A retrospective analysis. Optometry. 78(4): 155-161.
Houston K E. (2010) Measuring visual midline shift syndrome & disorders of spatial localization: A literature review & report of a new clinical protocol. J Behav Optom. 21(4): 87-93.
Kapoor N, Ciuffreda KJ. (2002) Vision Disturbances Following Traumatic Brain Injury. Current Treatment Options in Neurology. 4, 271-280
Kasten, E. et al. (2001). Stability of visual field enlargements following computer-based restitution training – results of a follow-up. Journal of Clinical and Experimental Neuropsychology, 23(3), 297-305.
Kerkhoff, G., et al (1994). Neurovisual rehabilitation in cerebral blindness. Archives of Neurology, 51 (5), 474-481.
Margolis, N et al. (2006). Visual field defects and unilateral spatial inattention: diagnosis and treatment. J Behav Optom. 17(2):31-37.
Nelles, G et al. (2007). Saccade induced cortical activation in patients with post-stroke visual field defects. Journal of Neurology, 254 (9), 1244-1252
Pambakian, ALM and Kennard C. (1997). Can visual function be restored in patients with homonymous hemianopia? British Journal of Ophthalmology. 81:324-323.
Perez C and Chokron S. (2014). Rehabilitation of homonymous hemianopia: insight into blindsight. Frontiers in Integrative Neuroscience. Volume 8 Article 82.
Pizzamiglio, L et al. (2006). Development of a rehabilitation program for unilateral neglect. Restorative Neurology and Neuroscience 24: 337–345
Politzer, T. (2015, April 22) Introduction to Vision and Brain Injury. Retrieved from Neuro-Optometric Rehabilitation Association website https://nora.cc/for-patients-mainmenu-34/vision-a-brain-injury-mainmenu-64.html
Romano, JG. (2011). Rehabilitation of hemianopic visual field defects. ACNR. 11 (1): 31-33.
Rowe et al. (2013) A prospective profile of visual field loss following stroke: prevalence, type, rehabilitation, outcome. Biomed Research International. http://dx.doi.org/10.1155/2013/719096
Sutter P and Harvey LH (editors). Vision Rehabilitation: Multidisciplinary Care of the Patient Following Brain Injury. 2011. Taylor and Francis Group, Florida
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Questions?