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Building Strategies Around CVI Phases
Ellen Cadigan Mazel, M.Ed., CTVI CVI Advisor Concord Area Special Education Collaborative: CASE
Building Strategies Around CVI Phases Ellen Cadigan Mazel, M.Ed., - - PowerPoint PPT Presentation
Building Strategies Around CVI Phases Ellen Cadigan Mazel, M.Ed., - - PowerPoint PPT Presentation
Building Strategies Around CVI Phases Ellen Cadigan Mazel, M.Ed., CTVI CVI Advisor Concord Area Special Education Collaborative: CASE 1 Why Do I Need to Know This? An audience poll 2 3 Why Do I Need to Know This? CVI is the #1 cause
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Why Do I Need to Know This?
CVI is the #1 cause of visual impairment in
children.
It requires new understanding of brain
function.
It requires new understanding for
assessment to build strategies.
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CVI Defined
Damage to the visual cortex. Damage to the visual pathways Both
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Eye and Brain are One
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Ocular Impairment with CVI:
Any child can have both types of
visual impairment.
Gather information Assess for both Create strategies for both
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Ten Characteristics
Color Movement Latency Visual Field Complexity Light Gazing Distance Visual Reflexive Response Visual Novelty Visual Motor
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Color
What colors alert this child’s brain to look?
- The brain is wired to notice
color.
- Red and yellow colors seem to
alert the brain.
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Movement
How does movement affect a child’s ability to look?
Movement alerts the brain especially in the
periphery.
Movement is a primitive defensive response in all
animals.
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Movement
Movement should be off to the side, shaking
without noise, in a small area.
Shiny items make the brain think it sees
movement due to the light’s refection.
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Latency
How long does it take a child to visually locate materials?
Quiets when the object is presented
peripherally:
Takes time to turn to use central vision.
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Visual Field
Does the child seem to see best in some visual fields? Assess:
Left Right Upper Lower
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Complexity
What level of multisensory presentation is tolerated? Complexity includes three areas:
Visual complexity Auditory complexity Positional complexity
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Visual Complexity
Background “busyness”. The child needs to see things at a very
close.
Lower light levels in the environment reduce
the complexity of the room.
Children will sleep to avoid complexity.
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Auditory Complexity
Auditory background distractions which
draw the child’s attention away from seeing.
Children have difficulty fixating on anything
in a noisy environment.
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Positional Complexity
The child struggles to see in difficult
physical positions.
In supported positions children can locate,
sustain and look with greater speed.
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Light Gazing / Non-purposeful Gaze
How does the child respond to light?
Light perception is a primitive visual ability. Children will seek out light sources and
stare.
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Light Gazing / Non-purposeful Gaze
Children will be distracted by light sources Children will have difficulty re-engaging with
materials.
Children perform better when light levels are
behind them.
The child stares without looking.
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Distance Viewing
At what distance can a child:
Look and locate? Look and recognize?
As children improve, they may be overly
attentive to distant movement.
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Visual Reflexive Responses
How the child react to touch near the eyes or to visual threat?
Immediately Delayed Not at all
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Visual Novelty
What items does the child already look at because they are familiar?
Parents report favorite toys. Looks at objects always present in their
environment.
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Visual Motor
What is the child’s quality of looking and reaching?
Quiets and looks only with peripheral
vision.
Locates and looks: no reaching.
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Visual Motor
Looks but turns away to reach. Looks and reaches but looks away as soon
as they reach the material.
Looks and reaches together. Continues to look while playing.
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CVI
Child is not looking. Child is not looking and reaching. Child is not processing visual information
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The child functioning?
Each characteristic: continuum from 1-10. Assess each characteristic: determine the
level of support.
Parent input is essential. Assess to chart progress Remove supports
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Levels of Severity: Phases of CVI
1.Phase I 2.Phase II 3.Phase III
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Spe Speci cific fic Go Goals als fo for Ea r Each ch Ph Phas ase Phase I: Building Visual Behaviors. Getting the child to look. Phase II: Integrating Vision with function. Phase III: Resolving Characteristics
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Strategies
Ocular impairment assessment is inappropriate
for a child with cortical visual impairment.
Strategies are based on assessment of
the ten characteristics.
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Phase I: Building Visual Behaviors
Single colored objects (often red, yellow but
not always)
Peripheral presentations Increased response time.
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Gently moving visual targets
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Materials that stay at near
Active Learning: Littlerooms
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Active Learning
Attribute trays
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Active Learning
Attribute trays
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Active Learning
Vests and materials near hands
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Phase I: Building Visual Behaviors
Use shiny items. Quiet environments, quiet toys. Reduced background complexity Single item presentations
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Reducing complexity: single item
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Reducing Complexity
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Phase I: Building Visual Behaviors
Well positioned child Staff should wear plain clothes Use three dimensional symbols: no
pictures!
Control and use light
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Phase I: Building Visual Behaviors
No programming for visual reflexes. Use familiar objects. Build lateral skills Targets everywhere at near: Preferential seating
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Lateral Skills
The child is looking at one kind
- f item now try
different colors
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Lateral skills
The child looks at one kind of item now try items with similar shapes.
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Phase I: Building Visual Behaviors
Use large targets. Place items in the best visual field. Challenge the weaker visual field. Register the child with state agencies for children with visual impairments.
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Other Phase 1 Strategies
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Phase II: Integrating Vision with
Function
Reduce complexity: auditory, visual and positional. Use highlighting color as part of visual target. Use embedded symbols
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Embedded Symbols
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Phase II: Integrating Vision with Function
Movement to gain visual attention. Allow for latency. Familiar items especially with new learning. Predictable books with salient feature.
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Phase II: Integrating Vision with
Function
Backlight materials/control light Use large print. Highlight best place to reach.
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Other Phase 11 Strategies
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Tell us other strategies you use
- r have used in Phase 11:
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Phase III: Resolving Characteristics
Reduce complexity: auditory, visual and
positional.
Increase word and letter spacing. Use color highlighting Use predictable books/materials.
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Phase III: Resolving Characteristics
Use large print Use covers and line keepers. Use backlighted technology Check facial recognition: Support social
skills
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Phase III: Resolving Characteristics
Assess using CVI Complexity cards
from APH
Move carefully from 3D to 2D. Assess 2D against levels of complexity.
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3D to 2D
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Pick a Salient Feature
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Other Phase 111 Strategies
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Tell us other strategies you use
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All strategies are in place only until skills
are built.
Assessment drives the strategies and the
reductions in strategies.
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Children are visually impaired.
Best practice for level of visual functioning
Register with agency for the blind. Assess using Learning Media Assessment. Provide direct service. Alert the child by addressing them by name.
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Best practice for level of visual functioning
Support compensatory skills. Use touch cues. Inservices to staff around CVI Inservice to staff around the specific
child’s skills.
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Fluctuating Vision
Consider the environment. Then consider the child.
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To Read More:
Christine Roman-Lantzy,Ph.D. Jim Jan, M.D. Gordon Dutton, M.D. Lea Hyvarinen, M.D. Mary Morse, Ph.D
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Resources
Cortical Visual Impairment: An Approach to
Assessment and Intervention by Christine Roman-Lantzy
CVI Perspectives available on quota from APH APH website TED Talks: “Vision”, “Visual Processing”,
“Brain” [Ted.com/talks]
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Resources
Texas School for the Blind website New England CVI mentors Perkins eLearning
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Building Strategies Around CVI Phases
Ellen Cadigan Mazel, M.Ed., CTVI CVI Advisor Concord Area Special Education Collaborative: CASE