CVI: Assessment, Phases, · 40-80% of the brain is involved with visual processing (Roman-Lantzy,...
Transcript of CVI: Assessment, Phases, · 40-80% of the brain is involved with visual processing (Roman-Lantzy,...
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CVI:Assessment, Phases,
and StrategiesMelanie Birthright
M. Ed., TVI, O&M, andPerkins-Roman CVI Range Endorsee
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PRE-SURVEY
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Why?
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Definition:...is used to describe visual impairment caused by brain damage or conditions that affect the part of the brain known as the posterior visual system (Huo, Burden, Hoyt, & Good, 1999). The posterior system is the region of the brain that includes the areas beyond the lateral geniculate nucleus; it includes the optic radiations and the visual cortex (Figure 1.1).
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CVI differs from ocular, eye-based forms of visual impairment in that the
interference in visual function exists not in the structures of the eye or the optic
nerve, but in the visual processing centers and visual pathways of the brain
(Jan & Groenveld, 1993).
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● 40-80% of the brain is involved with visual processing (Roman-Lantzy, 2007)
● Research suggests that the brain can rewire itself to dedicate itself to different functions (Lanners, Piccioni, Fea, & Goergen, 1999)
● Cortical Visual Impairment is the fast-growing (perhaps most complex) cause of visual impairment in the U.S.
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Perkins-Roman CVI Range Assessment
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● An effective replacement for the functional vision assessment
● Determines the degree of impact, or the extent of effect, of CVI
● Use with ages 6 months to 21 years
● 2 scores are obtained from the 2 different ratings○ Do not average the 2 scores
● Scores are on a 0-10 scale (10 characteristics)
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● 2 ratings should never be farther than 1.5 total points apart
● Overscoring, or inflated CVI Range scores are the most common error
● No child fully resolves all of the CVI characteristics
● 9 months to 3 years of age - reevaluated at least twice a year
● After 3 years of age - reevaluate annually
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10
CH
ARACTE
RIS
TICS
Need for movement
Object viewed needs to be moving to maximize the viewer’s ability to view object
Visual field preferences
Areas in peripheral fields where targets can be seen/not seen. Lower visual field dysfunction is common.
Need for light
Attracted to primary sources of light and needs light to be paired with a target to view the target
Atypical visual reflexes
The reflex to blink in response to an approaching object is absent or impaired
Absence of visually guided reach
The ability to look at and touch an object at the same time is not displayed; these two actions are typically performed separately
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10
CH
ARACTE
RIS
TICS Color preference
Attracted to color, sometimes a particular color
Visual latency
Delayed responses when looking at object
Difficulties with visual complexity
Categories of difficulty include complexity of the surface of the target viewed, complexity of the array of objects to be viewed, complexity of the sensory environment within which viewing takes place, and complexity of the human face
Difficulty with distance viewing
Cannot isolate targets beyond a certain distance
Difficulty with visual novelty
Increased visual attention is paid to targets that are familiar; there is lack of visual curiosity
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CVI ASSESSMENT LOOKS AT THE 10 CHARACTERISTIC BEHAVIORS
● “Across” CVI characteristics (Rating I)○ Statements that are observable behaviors○ A snapshot of behaviors that reflects level of CVI○ Observable behavior characteristics
● “Within” CVI characteristic (Rating II)○ The extent to which individual characteristics affect functional
vision○ The degree to which each individual CVI characteristic is affecting
the student
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INTERVENTIONS COME FROMTHE CVI RANGE
● Rating I is used to describe the present levels of function
● Rating II is used to describe accommodations
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CVI RANGE COMPONENTS
ObservationInterview
Direct Assessment
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ALL 3 MUST BE USEDAND INTEGRATED
INTO THESCORE!!!
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Observation
● Should be observed in living and learning environments
● Should be observed during a variety of circumstances
● Observation begins as soon as evaluator sees the student
● Unfamiliar areas are key areas especially for the Phase III students
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Interview
● Parents, caregivers, teachers, paraeducators, etc. Anyone that has IN-DEPTH knowledge regarding the student’s medical history and day-to-day functioning.
● Conduct in person
● Face-to-face conversation
● Use the researched recommended list of questions
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Direct Assessment
● Systematically present visual stimulation attempting to achieve a behavioral response typical of CVI in students with that condition, and then noting their response
● Select environment that will allow for best performance
● Eliminate all factors that might interfere with student’s vision ○ Evaluate vision under optimum conditions
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Take detailed notes
Look for patterns
These 3 components support each other in your determination of the
scores
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Scoring for Rating I:
+ Describes the current functioning of the studentDescribes behavior that is actually occurring
=/- Partially describes a behavior demonstrated by the studentCan be assigned if the behavior is occasional (neither strongly present
or strongly absent)Can be an emerging behavior
- Does not currently apply to the studentStatement represents a level of functioning not yet obtained
R Behavior was previous present, but now is resolving to a near typical-level for the student
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Rating I Scoring Guide Pg. 153-165
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Pg. 100
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Cei
ling
Effe
ct
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PHASE
3
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Phas
e II
I: Ex
tens
ion
Cha
rt
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Scoring for Rating II:● 0 The full effect of the characteristic is present
● .25 Behavior on this characteristic has begun to change orimprove
● .5 The characteristic is affecting visual functioning approximately half the time
● .75 Occasional effect of the characteristic; response is nearly like that of individuals the same age
● 1 Resolving, approaching typical, or response is the same as others of the same age (previously described as Resolved)
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Rating II Scoring GuidePg. 167-170
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PHASES
PHASE I (Range 0 to 3): Building visual behavior
PHASE II (Range 3+ to 7): Integrating vision with function
PHASE III (Range 7+ to 10): Refinement of remaining CVI characteristics
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PHASE I/Strategies
● Recognizes objects they have been exposed to repeatedly and under very controlled environmental conditions
● Relies on the dorsal stream visual processing (it is primarily concerned with the detection of movement and location)
● Turns in the direction of light, but does not demonstrate eye-to-eye contact with a visual target
● Activities should be designed to increase visual attention and to build stable and sustained looking
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PHASE I/Strategies
● Control other sensory input present in the environment for them to use vision
● Select materials that you can apply to Phase II
● Objects for viewing should ideally extend from eye to hand
● Identify at least 2 opportunities in each quarter of the day...then add frequency
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PHASE II/Strategies
● Indicates a want or need by looking at a specific target or reaching toward a desired object or person
● No longer passively looking
● Demonstrates eye-to-object on a target represents the activation of the ventral stream of visual processing. Parts of the brain that regulate the development of visual detail are now “turned on.”
● Can tolerate some environmental distractions while using vision
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PHASE II/Strategies
● Identifies the location of a target but also to identify details that differentiate one object from another
● Looking is not the same thing as interpreting (integrating vision with function)
● Locates key components of objects, not simply the location of the object
● Perceives their own ability to affect the world through active participation (reach, swat, activate, grasp)
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https://www.youtube.com/watch?v=oYAC1Ia-R_4&feature=youtu.be
https://studio.code.org/projects/dance/Q-rcq9Nn42XaHnUsx9yiu8IcVjeLT3RD-mpCo088U9k?sfns=mo
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Stephanie Fountain: Cortical Visual Impairment (cvi) Awareness (Facebook)
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PHASE III/Strategies
● May need more interventions than a Phase I/Phase II
● Refinement of characteristics continues
● Refinement is primarily associated with fine-tuning of ventral stream visual functions
● CVI Range Assessment is still needed
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● Demonstrates visual attention across the day○ Continue to require adaptations to materials and
specialized instruction
● Now functions visually○ Might not be recognized as someone that has CVI by
casual observers
● Characteristics rarely become completely normal
● Lifelong condition
PHASE III/Strategies
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APPS(A couple of my favorites that DO cost money)
Sensory Light Box $2.99
Bebot $1.99
Light Box $0.99
Baby’s Musical Hands $0.99
EDA Play $4.99
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APPS(A couple of my favorites that do NOT cost money)
Tap-N-See Now $0.00
Soft Box $0.00
Fluidity $0.00
Baby Bubbles $0.00
Art of Glow $0.00
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The easiest MAKE AND TAKE Session EVER!!!!
Mardi Gras Bead Curtain
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IN YOUR FREE TIME
Perkins School for the Blind Start Seeing CVI
WonderBaby CVI Connect
CVI Teacher Paths to Literacy
Facebook:Cortical Visual Impairment(CVI) Awareness
Cortical Visual Impairment ProfessionalsCVI Scotland
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Resources● Roman-Lantzy, C. (2018). Cortical visual impairment: an approach to assessment and
intervention (2nd ed.). New York, NY: AFB Press, American Foundation for the Blind.
● Roman-Lantzy, C. (2019). Cortical visual impairment: advanced principles. Louisville, KY: APH Press, American Printing House for the Blind.
● Tallent, A., Tallent, A. F., & Bush, F. (2012). Little Bear sees: how children with cortical visual impairment can learn to see. Honolulu, HI: Little Bear Sees Publishing.
● (n.d.). CVI Resources. Retrieved from http://cviresources.com/
● (2017, June 6). Our 20 Favorite iPad Apps for Kids with CVI. Retrieved from http://www.wonderbaby.org/articles/cvi-apps
● (2015, January 20). Guidelines for interview questions. Retrieved from https://cvi.aphtech.org/?page_id=71
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Resources● (2018, March 26). Apps We LIke for Phase III CVI. Retrieved from
https://startseeingcvi.com/2018/03/26/apps-we-like-for-phase-iii-cvi#more-1497
● (2018, March 26). Apps We LIke for Phase III CVI. Retrieved from https://startseeingcvi.com/2018/03/26/apps-we-like-for-phase-iii-cvi#more-1497
● Gardier, J. (n.d.). STRATEGIES FOR WORKING WITH CHILDREN WITH CORTICAL VISUAL ... Retrieved from http://mtdeafblind.ruralinstitute.umt.edu/www/wp-content/uploads/strategiescorticalvisualimpairment.pdf
● Books, materials and supplies for Make and Take session from American Printing House for the Blind, Amazon and Wal-Mart
● Fountain, S. (2015, October 26). Stephanie Fountain>Cortical Visual Impairment (CVI) Awareness
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A Big THANK YOU to ESVI for donating the products, materials and supplies!!!
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