Teaching Students with Visual Impairments
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      • Developing SMARTER Goals
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  • ECC Bonus
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    • Interactive Sensory Stories
    • Interactive Matching Activities
    • Interactive Visual Discrimination Activities
    • Interactive Choice Making Activities
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  • Presentations
    • Schedule a Presentation
    • Workshops >
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    • Foundations of Teaching the ECC in the Age of Virtual Instruction
    • Strategies & Activities for SIDPID
    • Strategies & Activities for MIMO
    • Job Tasks for Job, Career & Life
    • Itinerant Teaching Strategies & Tips
    • Accommodations for VI
    • Strategies & Activities for Standard Course of Study
    • Using Themes to Teach the ECC
    • Accessible Content for BLVI
    • Conducting a FVLMA
    • Developing SMARTER Goals
    • Selecting the Right AT
    • Tips for Being a "Physically Fit" TVI
    • The Art of Teaching the ECC
    • Activities to Teach the ECC
    • Determining Service Intensity Using the VISSIT
  • Professional Practice
    • Vision Professionals >
      • Become a Vision Professional
      • Professional Preparation Programs
      • Teacher of Students with Visual Impairments
      • Orientation & Mobility Specialist
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      • CATIS
      • Parapros & Braille Transcribers
    • Professionalism >
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      • Awards & Recognition
      • APH Scholar Program
    • Instructional Planning >
      • VI Program Handbook
      • Caseload Analysis
      • Itinerant Teaching Tips
      • Year at a Glance
      • Role of the Classroom Teacher
      • Simulation Activities
    • Professional Publications >
      • General VI Resource Books
      • CVI & MD Resource Books
      • Braille Resource Books
      • O&M Resource Books
      • Early Intervention Resource Books
      • Journal Resources
  • Foundations of VI
    • History of Visual Impairments >
      • Timeline of VI
      • Biblical Passages Concerning Blindness
      • Notable People
      • Helen Keller
      • APH Museum
      • Leaders & Legends
      • History of Braillewriters
      • Legislation
    • Visual Impairments >
      • Structure & Function of the Eye
      • Vision Classifications
      • Common Vocabulary
      • Common Visual Impairments
      • Cortical Visual Impairments
      • Convergence Insufficiency (CI)
      • Deaf-Blind
    • VI Resources >
      • VI Organizations
      • US Government Agencies
      • Support Networks
      • Deaf-Blind Resources
      • Georgia Vision Resources
      • Online Parent Resources
    • V.I. Book Resources >
      • Children's Books
      • Young Reader Books
      • Books about Dog Guides
      • Teen & Young Adult Books
      • Non-Fiction Books
      • Helen Keller Books
      • Parent Resource Books
      • Grief & Suffering Books
    • Impact on Development & Learning
    • Psychological Impact
    • Social Etiquette
    • Financial Assistance
  • VI Service
    • Educational Programming >
      • National Agenda
      • The Expanded Core Curriculum
      • IDEA and Vision
      • Federal Quota Funds
      • Deaf-Blind Child Count
      • State SpEd Agencies
      • Schools for the Blind
    • Referrals >
      • Vision Concerns
      • Referral Process
      • Eligibility Guidelines
      • Vision Therapy Controversy
      • When Student Doesn't Qualify
    • Medical Vision Exams >
      • Medical Professionals
      • Vision Tests & Tools
      • Visual Acuity
      • Lenses
      • Visual Fields
    • FVLMA >
      • What is the FVE
      • Interpret the Eye Report
      • Environmental Observations
      • FVLMA Observations
      • Interviews
      • Assessment Kit Materials
      • Oculomotor Skills
      • Near Visual Acuities
      • Print Comparisons
      • Distance Acuity
      • Test Visual Fields
      • Vision Skills
      • Learning Media Assessment
      • Reading Rates
      • Writing the FVE Report
    • Service Planning >
      • ECC Annual Needs
      • Service Delivery Models
      • Least Restrictive Environment
      • Early Intervention Services
      • Students with Multiple Disabilities
      • Student Led IEPs
      • 504 Plans
      • Transition Plans
    • Writing Goals >
      • Writing SMART Goals
      • Blooms Taxonomy
      • Independent Living Goals
      • Compensatory Goals
      • Sensory Efficiency Goals
      • Assistive Technology Goals
      • Social Skills Goals
      • Recreation & Leisure Goals
      • Self Determination Goals
      • Career & Vocational Goals
    • Low Vision Eval
    • O&M Evaluation
    • Educational Assessments
  • Adaptations
    • Unique Visual Needs
    • Accommodations & Modifications
    • Home Adaptations >
      • General Home Safety
      • Kitchen Adaptations
      • Bathroom Adaptations
      • Medication Adaptations
      • Clothing Management Adaptations
    • Curriculum Adaptations >
      • Numbers & Counting
      • Algebra
      • Geometry & Spatial Sense
      • Measurement & Data
      • Early Literacy Experiences
      • Create Tactile Books
      • Reading Instruction
      • Reading Efficiency
      • Science Adaptations
      • Social Studies Adaptations
    • Material Adaptations >
      • Accessible Educational Materials
      • Large Print
      • Braille Code
      • Photocopying
      • Font Legibility
      • Increase Contrast
      • Pictures and Worksheets
      • Tactile Graphics Guidelines
      • Creating Tactile Graphics
      • Teacher Made Materials for Students with MD
    • Instructional Adaptations >
      • Individual Schedules & Communication Cards
      • Movies & Assemblies
      • Lectures & Instruction
      • Board Work (Chalk, Interactive, White)
    • Environmental Adaptations >
      • School Campus Adaptations
      • Classroom Design Tips
      • Labeling System
      • Adjust Lighting
      • Playground Adaptations
      • Sensory Areas & Rooms
    • Early Childhood Adaptations >
      • Daily Schedule
      • Morning Meeting
      • Weather Check
      • Dramatic Play
      • Blocks
    • Adaptations to the Arts >
      • Art Adaptations
      • Art Materials
      • Music
      • Music & Movement
      • Dance
    • Recreation & Leisure Adaptations >
      • Recreation Adaptations
      • VI Sports Associations
      • Recreation Resources
      • Camps for VI
      • Card and Board Game Adaptations
      • Transcribe Playing Cards
  • VI AT
    • Overview of Assistive Technology
    • VI Assistive Technology >
      • Non-Optical Low Vision Devices
      • Low/Medium Tech Devices for Tactual Learners
      • Optical Devices for Near
      • Optical Devices for Distance
      • Video Magnifiers
      • Screen Magnification & Readers
      • Braille Technology
      • Tactile Graphics Technology
      • Auditory Access Devices
      • Braillewriter Repair
    • Apps for VI >
      • Note Taking Apps
      • Apps for Accessing Books
      • Identification Apps
      • Navigation & Location Apps
      • Braille Apps
      • Magnifier Apps
      • Sound Making Apps
      • Cause & Effect Apps
      • Vision Skills Apps
      • Apps for Early Learning
      • Read to Me Story Apps
      • Apps for Communication
      • Android Apps for VI
    • AT Instruction >
      • Video Magnifier Instruction
      • Notetaker Instruction
      • Accessing Audio Books
      • Navigate Computer without a Mouse
      • Word Processing and Shortcuts
      • Keyboarding Instruction
    • iOS for VI >
      • iPads as Instructional Tools
      • Making the iOS Device Accessible
      • iOS Accessibility Resources
      • VoiceOver
    • Assistive Technology Assessment
    • VI AT Resources
    • Vendors
  • Instruction
    • Virtual Instruction
    • Instructional Strategies >
      • Development of ECC Resources
      • Teaching in Thematic Units
      • Teaching the ECC
      • Summer Reading (braille)
      • Summer Outdoor Activities
      • Rainy Day Activities
    • Compensatory >
      • Guiding Principles of Concept Development
      • Functional Skills
      • Community Based Experiences
      • Concepts to Teach
      • Organization & Study Skills
      • Cranmer Abacus Instruction
      • Time Management
    • Communication Modes >
      • Language Development
      • Braille Instruction
      • Braille Instruction Materials
      • Writing Braille
      • Signature & Handwriting Instruction
      • Nemeth Braille Code
      • Tactile Graphics Instruction
    • Sensory Efficiency >
      • Sensory Input
      • Encourage Use of Vision in Students with MD
      • Lightbox Use
      • Sensory Activities for Students with MD
      • Sensory Table
      • Visual Efficiency Skills
      • Visual Attend and Scan Activities
      • Visual Tracking Activities
      • Visual Discrimination Activities
      • Visual Motor Activities
      • Optical Device Use
      • Tactual Readiness
      • Developing Skillful Hands
      • Auditory Readiness
      • Listening Skills Instruction
    • Independent Living >
      • Responsibility & Independence
      • Mealtime Independence
      • Eating Adaptations
      • Food Preparation
      • Recipe Activities
      • Hygiene & Grooming
      • Dressing & Clothing Management
      • Money
      • Housekeeping Instruction
    • Orientation & Mobility >
      • Transition Between Activities
      • Proper Guide Techniques
      • Orienting Student to Environment
      • Mobility Skills
      • Travel
      • Dog Guides
    • Social Skills >
      • Non-Verbal Communication
      • Social Interactions
      • Self Concept
      • Icebreakers & Mixers
    • Career Education >
      • Classroom Jobs
      • Career & Vocational
      • Prepare for College & Career
    • Recreation & Leisure >
      • Learn to Play
    • Self Determination

Visual Acuities of Individuals who are Blind or Visually Impaired

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Visual Acuity

​by: Carmen Willings
teachingvisuallyimpaired.com
​Updated March 11, 2018

Acuity describes the amount of detail the individual sees compared to what a person with normal vision sees.  It refers to the sharpness of vision in relation to discriminating detail. It is usually given in Snellen notation. 20/20 is considered 100% or "normal" vision and means that the individual being checked sees at 20 feet what should be seen at 20 feet. 
The common phrase “20/20 vision” refers to how acuity is measured; the top number, 20, refers to the distance at which the measurement is taken, and the bottom number refers to the distance at which a “normal” eye can see a specific size image. If a person has 20/40 acuity, it means he can see at 20 feet that which someone with “normal” vision can see at 40 feet.  The smaller the second number, the more sight a person has. Low vision means a person’s visual acuity is 20/50 or worse. The larger the second number, the less vision a person has. Remember when interpreting an eye report, cc is the abbreviation for with correction and sc is the abbreviation for without (or sans) correction.
How Acuity is Written on Reports:
V


NV

W
OD Visual Acuity of Right Eye
OS Visual Acuity of Left Eye

OD Jaeger Notation
OS

OD Glasses patient is wearing
OS
An acuity provides information on how much the cones and the rods in the eyes are capable of seeing under certain lighting conditions and what their threshold is.  Keep in mind that there is no correlation between acuity and visual functioning. Two people with the same visual acuity may have very different visual functioning. Also be aware that vision is a learned response.

Visual acuity is one of the main factors in determining eligibility for school based vision services and whether the student is identified as visually impaired or blind. The clinical eye exam should include formal testing of the student's near and distance acuity when a student is able to participate in formal testing. Visual acuity testing should be conducted with correction (cc) if the student has been prescribed glasses or contacts and also without correction (sc). Having both acuities can be very helpful in understanding the student's vision and whether or not they tolerate wearing the classes or don't as they don't see much improvement. 

Near Visual Acuity

Picture of a near vision acuity chart.
Near visual acuity indicates the smallest letter, picture or symbol size the student is able to discriminate at a near distance, typically measured at 12 to 14 inches. When an acuity is provided, there should also be a note about the distance the student used in order to identify the symbols. For educational purposes, this impacts a students ability to read various size materials within the classroom, menus, brochures, etc.

Distance Visual Acuity

Distance visual acuity indicates the smallest letter, picture or symbol size the student is able to discriminate at a distance, typically measured at 20 feet. For educational purposes, this will indicate whether or not a student can see information presented in the classroom, during assemblies, or demonstration lessons. This will affect the student in extracurricular activities including ability to see a fast food menu, reading street signs, seeing a scoreboard or jerseys at sports games, or locating people at distances. The Snellen chart is the most common eye chart used when assessing the person's visual acuity. 

Functional Acuity Estimates

When a student is unable to participate in formal testing, an ophthalmologist may provide an estimate of the child's acuity or they may indicate the student Functions at the Definition of Blindness.

Print Comparisons

This page provides environmental print comparisons to the Snellen chart as well as approximation of the student's visual acuity when a student does not respond or cooperate using standard assessments.

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The mission of Teaching Students with Visual Impairments is to provide all persons involved in education students who are blind or visually impaired with the necessary resources to help each student become successful members of their communities and to equip those in the visual impairment field with resources to meet the wide range of needs of the students they serve. ​
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  • Home
    • About
    • Contact
    • FAQs
    • Site Map
    • User Agreement
    • Privacy Policy
  • FREE Printables
    • Free Program Printables
    • Free FVLMA & Service Printables
    • Free VI AT Printables
  • VI Store
    • Product Support
    • ECC Instructional Resources >
      • TVI's Guide Complete Set Bundle
      • TVI's Guide to Teaching the ECC
      • Visual Efficiency & Magnifier Grab & Go
      • Thematic Keyboarding & Braille Fluency
      • Vocabulary Cards & Checklists
      • Interactive Sensory Stories Product
      • Interactive Matching Activities
      • Interactive Visual Discrimination Product
    • Purchase Recorded Presentations >
      • Presentation Complete Set of 16
      • Webinar Complete Set
      • Accessible Content for BLVI
      • Foundations of Teaching the ECC
      • Strategies & Activities for SIDPID
      • Strategies & Activities for MIMO
      • Job Tasks for Job, Career, & Life
      • Itinerant Teaching Strategies & Tips
      • Accommodations for VI
      • Strategies & Activities for Standard Course of Study
      • Tips for Being a "Physically Fit" TVI
      • Conducting a FVLMA
      • Developing SMARTER Goals
      • Determining Service Intensity Using the VISSIT
      • Strategies for Selecting the Right AT
      • The Art of Teaching the ECC
      • Activities to Teach the ECC
      • Using Themes to Teach the ECC
    • Job Postings >
      • 1 Month Job Posting
      • 3 Month Job Posting
      • 6 Month Job Posting
      • 1 Year Job Posting
    • Braille Jewely
  • Jobs
    • Post a Job
    • TVI, Hagerstown, MD
    • TVI, NE Georgia RESA
    • TVI, Albemarle, Virginia
    • TBVI/COMS Minnesota
    • TVI North Carolina
    • TVI/COMS South Burlington, VT
    • TVI Brunswick, ME
    • TVI Portland, ME
  • ECC Bonus
    • ECC Bonus Printables
    • Unit Preparation Tips
    • ECC Song Playlists
    • Interactive Sensory Stories
    • Interactive Matching Activities
    • Interactive Visual Discrimination Activities
    • Interactive Choice Making Activities
    • Job Task Boxes
  • Presentations
    • Schedule a Presentation
    • Workshops >
      • Abilene, TX
      • Lubbock, TX
    • Foundations of Teaching the ECC in the Age of Virtual Instruction
    • Strategies & Activities for SIDPID
    • Strategies & Activities for MIMO
    • Job Tasks for Job, Career & Life
    • Itinerant Teaching Strategies & Tips
    • Accommodations for VI
    • Strategies & Activities for Standard Course of Study
    • Using Themes to Teach the ECC
    • Accessible Content for BLVI
    • Conducting a FVLMA
    • Developing SMARTER Goals
    • Selecting the Right AT
    • Tips for Being a "Physically Fit" TVI
    • The Art of Teaching the ECC
    • Activities to Teach the ECC
    • Determining Service Intensity Using the VISSIT
  • Professional Practice
    • Vision Professionals >
      • Become a Vision Professional
      • Professional Preparation Programs
      • Teacher of Students with Visual Impairments
      • Orientation & Mobility Specialist
      • Low Vision Specialist
      • Rehabilitation Specialists
      • CATIS
      • Parapros & Braille Transcribers
    • Professionalism >
      • Professional Ethics
      • Professional Development
      • Teacher Standards
      • Professional Organizations
      • Certification Organizations
      • Awards & Recognition
      • APH Scholar Program
    • Instructional Planning >
      • VI Program Handbook
      • Caseload Analysis
      • Itinerant Teaching Tips
      • Year at a Glance
      • Role of the Classroom Teacher
      • Simulation Activities
    • Professional Publications >
      • General VI Resource Books
      • CVI & MD Resource Books
      • Braille Resource Books
      • O&M Resource Books
      • Early Intervention Resource Books
      • Journal Resources
  • Foundations of VI
    • History of Visual Impairments >
      • Timeline of VI
      • Biblical Passages Concerning Blindness
      • Notable People
      • Helen Keller
      • APH Museum
      • Leaders & Legends
      • History of Braillewriters
      • Legislation
    • Visual Impairments >
      • Structure & Function of the Eye
      • Vision Classifications
      • Common Vocabulary
      • Common Visual Impairments
      • Cortical Visual Impairments
      • Convergence Insufficiency (CI)
      • Deaf-Blind
    • VI Resources >
      • VI Organizations
      • US Government Agencies
      • Support Networks
      • Deaf-Blind Resources
      • Georgia Vision Resources
      • Online Parent Resources
    • V.I. Book Resources >
      • Children's Books
      • Young Reader Books
      • Books about Dog Guides
      • Teen & Young Adult Books
      • Non-Fiction Books
      • Helen Keller Books
      • Parent Resource Books
      • Grief & Suffering Books
    • Impact on Development & Learning
    • Psychological Impact
    • Social Etiquette
    • Financial Assistance
  • VI Service
    • Educational Programming >
      • National Agenda
      • The Expanded Core Curriculum
      • IDEA and Vision
      • Federal Quota Funds
      • Deaf-Blind Child Count
      • State SpEd Agencies
      • Schools for the Blind
    • Referrals >
      • Vision Concerns
      • Referral Process
      • Eligibility Guidelines
      • Vision Therapy Controversy
      • When Student Doesn't Qualify
    • Medical Vision Exams >
      • Medical Professionals
      • Vision Tests & Tools
      • Visual Acuity
      • Lenses
      • Visual Fields
    • FVLMA >
      • What is the FVE
      • Interpret the Eye Report
      • Environmental Observations
      • FVLMA Observations
      • Interviews
      • Assessment Kit Materials
      • Oculomotor Skills
      • Near Visual Acuities
      • Print Comparisons
      • Distance Acuity
      • Test Visual Fields
      • Vision Skills
      • Learning Media Assessment
      • Reading Rates
      • Writing the FVE Report
    • Service Planning >
      • ECC Annual Needs
      • Service Delivery Models
      • Least Restrictive Environment
      • Early Intervention Services
      • Students with Multiple Disabilities
      • Student Led IEPs
      • 504 Plans
      • Transition Plans
    • Writing Goals >
      • Writing SMART Goals
      • Blooms Taxonomy
      • Independent Living Goals
      • Compensatory Goals
      • Sensory Efficiency Goals
      • Assistive Technology Goals
      • Social Skills Goals
      • Recreation & Leisure Goals
      • Self Determination Goals
      • Career & Vocational Goals
    • Low Vision Eval
    • O&M Evaluation
    • Educational Assessments
  • Adaptations
    • Unique Visual Needs
    • Accommodations & Modifications
    • Home Adaptations >
      • General Home Safety
      • Kitchen Adaptations
      • Bathroom Adaptations
      • Medication Adaptations
      • Clothing Management Adaptations
    • Curriculum Adaptations >
      • Numbers & Counting
      • Algebra
      • Geometry & Spatial Sense
      • Measurement & Data
      • Early Literacy Experiences
      • Create Tactile Books
      • Reading Instruction
      • Reading Efficiency
      • Science Adaptations
      • Social Studies Adaptations
    • Material Adaptations >
      • Accessible Educational Materials
      • Large Print
      • Braille Code
      • Photocopying
      • Font Legibility
      • Increase Contrast
      • Pictures and Worksheets
      • Tactile Graphics Guidelines
      • Creating Tactile Graphics
      • Teacher Made Materials for Students with MD
    • Instructional Adaptations >
      • Individual Schedules & Communication Cards
      • Movies & Assemblies
      • Lectures & Instruction
      • Board Work (Chalk, Interactive, White)
    • Environmental Adaptations >
      • School Campus Adaptations
      • Classroom Design Tips
      • Labeling System
      • Adjust Lighting
      • Playground Adaptations
      • Sensory Areas & Rooms
    • Early Childhood Adaptations >
      • Daily Schedule
      • Morning Meeting
      • Weather Check
      • Dramatic Play
      • Blocks
    • Adaptations to the Arts >
      • Art Adaptations
      • Art Materials
      • Music
      • Music & Movement
      • Dance
    • Recreation & Leisure Adaptations >
      • Recreation Adaptations
      • VI Sports Associations
      • Recreation Resources
      • Camps for VI
      • Card and Board Game Adaptations
      • Transcribe Playing Cards
  • VI AT
    • Overview of Assistive Technology
    • VI Assistive Technology >
      • Non-Optical Low Vision Devices
      • Low/Medium Tech Devices for Tactual Learners
      • Optical Devices for Near
      • Optical Devices for Distance
      • Video Magnifiers
      • Screen Magnification & Readers
      • Braille Technology
      • Tactile Graphics Technology
      • Auditory Access Devices
      • Braillewriter Repair
    • Apps for VI >
      • Note Taking Apps
      • Apps for Accessing Books
      • Identification Apps
      • Navigation & Location Apps
      • Braille Apps
      • Magnifier Apps
      • Sound Making Apps
      • Cause & Effect Apps
      • Vision Skills Apps
      • Apps for Early Learning
      • Read to Me Story Apps
      • Apps for Communication
      • Android Apps for VI
    • AT Instruction >
      • Video Magnifier Instruction
      • Notetaker Instruction
      • Accessing Audio Books
      • Navigate Computer without a Mouse
      • Word Processing and Shortcuts
      • Keyboarding Instruction
    • iOS for VI >
      • iPads as Instructional Tools
      • Making the iOS Device Accessible
      • iOS Accessibility Resources
      • VoiceOver
    • Assistive Technology Assessment
    • VI AT Resources
    • Vendors
  • Instruction
    • Virtual Instruction
    • Instructional Strategies >
      • Development of ECC Resources
      • Teaching in Thematic Units
      • Teaching the ECC
      • Summer Reading (braille)
      • Summer Outdoor Activities
      • Rainy Day Activities
    • Compensatory >
      • Guiding Principles of Concept Development
      • Functional Skills
      • Community Based Experiences
      • Concepts to Teach
      • Organization & Study Skills
      • Cranmer Abacus Instruction
      • Time Management
    • Communication Modes >
      • Language Development
      • Braille Instruction
      • Braille Instruction Materials
      • Writing Braille
      • Signature & Handwriting Instruction
      • Nemeth Braille Code
      • Tactile Graphics Instruction
    • Sensory Efficiency >
      • Sensory Input
      • Encourage Use of Vision in Students with MD
      • Lightbox Use
      • Sensory Activities for Students with MD
      • Sensory Table
      • Visual Efficiency Skills
      • Visual Attend and Scan Activities
      • Visual Tracking Activities
      • Visual Discrimination Activities
      • Visual Motor Activities
      • Optical Device Use
      • Tactual Readiness
      • Developing Skillful Hands
      • Auditory Readiness
      • Listening Skills Instruction
    • Independent Living >
      • Responsibility & Independence
      • Mealtime Independence
      • Eating Adaptations
      • Food Preparation
      • Recipe Activities
      • Hygiene & Grooming
      • Dressing & Clothing Management
      • Money
      • Housekeeping Instruction
    • Orientation & Mobility >
      • Transition Between Activities
      • Proper Guide Techniques
      • Orienting Student to Environment
      • Mobility Skills
      • Travel
      • Dog Guides
    • Social Skills >
      • Non-Verbal Communication
      • Social Interactions
      • Self Concept
      • Icebreakers & Mixers
    • Career Education >
      • Classroom Jobs
      • Career & Vocational
      • Prepare for College & Career
    • Recreation & Leisure >
      • Learn to Play
    • Self Determination