chapter twelve individuals with visual impairments
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Chapter TwelveIndividuals With Individuals With
Visual ImpairmentsVisual Impairments
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Defining Visual Impairments
IDEA definition: Visual impairment that, even with correction, adversely affects an individual’s educational performance
Legally blindCorrected vision has acuity of 20/200
or lessFunctionally blind
Very limited visionLow vision
Minimal visionWatch this video of an eye examination.
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The Eye and How it Works
Light enters the eye through the cornea and then moves through the iris into the pupil. The light is converged by the lens and moves through the vitreous humor to focus on the retina where the light is changed into electrical signals that are sent along the optic nerve to the occipital lobe of the brain for interpretation as visual images.
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The Eye and How it Works
Myopia (near sightedness)Light focuses before it reaches the
back of the eyeHyperopia (far sightedness)
Light has not focused when it reaches the back of the eye
Astigmatism One or more surfaces of the cornea or
lens are not spherical but cylindrical
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Brief History of the Field1700s
First school for blind youth (in Paris)1800s
Louis Braille created a system of Braille dots for communication
Schools for the blind opened in the U.S.1950s and 1960s
Public school classes for child with visual impairments
1970sVision training to maximize residual sightIDEA requires specialized services and
access to public school classrooms
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Prevalence of Visual Impairments 2.8% of American school-aged children
experience a vision loss significant enough to require special education
The U.S. Department of Education reports approximately 26,000 children ages 6-21 received special education services during the 2008-2009 school year
Low-incidence disability
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The Vision Process and Etiology of Visual ImpairmentsCornea
Damage/infection limits acuity and visual field
Aqueous fluidGlaucoma limits acuity and visual field
IrisMalformation causes light sensitivity
LensCataracts affect vision, color, light
sensitivity
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The Vision Process and Etiology of Visual Impairments
Vitreous bodyInfection/disease blurs and distorts vision
RetinaLight disruption results in blurred vision
Rod cells in retinaShape, motion, photosensitivity
Cone cells in retinaColor
Watch this video to learn more about the macular degeneration process
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Prevention of Visual Impairments
Most visual impairments are genetic Prenatal care Early detection through vision screening Eye safety
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Characteristics of Individualswith Visual Impairments Academic performance Social and emotional development Educational implications Independent living skills Vocational skills
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Assessment of Individualswith Visual Impairments
Snellen chart Functional visual evaluation
o Literacy mediumo Learning mediao Large printo Grade 1 Brailleo Grade 2 Braille
Learn more about reading Braille in this video
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Young Children with Visual ImpairmentsEarly intervention
Individualized family service plan (IFSP)Early childhood programsPrograms for young children with visual
impairments teach:Visual and auditory skills, sensory
development, fine and gross motor development, social development, receptive and expressive language development, self-help development, daily living skills
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Transition into AdulthoodTransition planning includes:
Vocational trainingPostsecondary educational
opportunitiesTravel skills (orientation and mobility)Use of community resourcesSocial adjustmentIndependence
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Adults with Visual Impairments
• Employment possibilities and acquiring job skills
• Leisure time activities and community participation
• Orientation and mobility training• Using technology
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Family Issues
Services Advocacy Education
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Issues of Diversity
Cultural susceptibility to eye diseases Socioeconomic status influences
availability of eye care Cultural implications
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Technology and Individuals with Visual Impairments Assistive technology Technology and literacy PL 108-446 requires the IEP team to
consider the provision of assistive technology devices and services in the development of the student’s IEP. Under IDEA, Braille instruction is required unless the IEP team determines that it is not appropriate after evaluation of the student’s reading and writing skills, needs, and appropriate reading and writing media.
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Trends, Issues, and Controversies
Teacher shortages Orientation and mobility specialist
shortages Reading media assessment
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