Vision-MDT®

Clinical Red Flags for Neurovisual Dysfunction (NVD)

A Framework for Risk Identification, Functional Screening, and Referral Decision-Making

Version 1.0 – Draft Framework

Vision Is More Than Seeing

Vision is not merely the ability to detect visual stimuli.

It is the brain’s capacity to acquire, process, integrate, and use visual information to guide behavior, learning, movement, environmental interaction, and participation in daily life.

1. Purpose of This Document

This document has been developed to assist clinicians, rehabilitation professionals, educators, and multidisciplinary teams in identifying individuals who may be at risk for Neurovisual Dysfunction (NVD).

The framework is intended to support:

  • Early risk identification
  • Functional screening
  • Multidisciplinary communication
  • Referral decision-making
  • Comprehensive functional assessment planning

This document is not intended to serve as:

  • Diagnostic criteria
  • A standalone clinical scale
  • A disease classification system

Rather, it provides a practical framework for recognizing clinical presentations that may warrant further neurovisual evaluation.

2. Conceptual Framework

Traditional vision assessment primarily focuses on:

  • Visual acuity
  • Refractive status
  • Ocular pathology

However, many individuals with apparently normal visual acuity continue to experience significant functional difficulties, including:

  • Reading difficulties
  • Visual fatigue
  • Binocular vision dysfunction
  • Visual-spatial impairments
  • Problems with spatial orientation
  • Visual attention deficits
  • Difficulties in complex environments
  • Visuomotor integration problems
  • Learning and behavioral challenges
  • Reduced social participation

Accordingly:

The ability to see does not necessarily imply normal visual functioning.

Vision-MDT® emphasizes that neurovisual function extends beyond sensory input from the eyes and includes the brain’s ability to interpret, organize, and utilize visual information for effective participation in everyday activities.

For many patients, the primary challenge is not reduced eyesight, but impaired neural processing and environmental integration of visual information.

Neurovisual Dysfunction (NVD) may therefore affect:

  • Learning and reading
  • Spatial navigation
  • Environmental adaptation
  • Visuomotor performance
  • Emotional and behavioral regulation
  • Social participation
  • Neurorehabilitation outcomes
  • Activities of daily living

3. Populations at Increased Risk

3.1 Pediatric and Developmental Populations

Children with neurodevelopmental conditions may be at elevated risk, including:

  • Cerebral palsy
  • Attention-Deficit/Hyperactivity Disorder (ADHD)
  • Autism Spectrum Disorder (ASD)
  • Learning disorders (including dyslexia)
  • Developmental Coordination Disorder (DCD)
  • Auditory Processing Disorder (APD)
  • Speech and language disorders
  • Global Developmental Delay (GDD)
  • Sensory processing difficulties
  • Social communication disorders
  • Behavioral and emotional disorders
  • Intellectual developmental disorders

3.2 Neurorehabilitation Populations

Individuals with acquired neurological conditions, including:

  • Stroke
  • Traumatic brain injury (TBI)
  • Brain tumors
  • Hypoxic-ischemic brain injury
  • Post-encephalitic neurological dysfunction
  • Neurodegenerative disorders
  • Demyelinating diseases

3.3 Ophthalmic and Vision-Related Conditions

Including but not limited to:

  • Strabismus
  • Amblyopia
  • Developmental visual dysfunction
  • Binocular vision disorders
  • Neuro-ophthalmic conditions
  • Low vision
  • Visual information processing disorders

4. Clinical Neurovisual Red Flags

Domain A. Core Neurovisual Symptoms

Potential indicators include:

  • Strabismus
  • Diplopia
  • Blurred vision during binocular viewing
  • Moving, overlapping, or unstable text while reading
  • Visual field loss
  • Hemispatial neglect
  • Motion sensitivity
  • Dizziness or nausea induced by visual stimuli
  • Light sensitivity
  • Screen sensitivity
  • Difficulty processing visual information despite being able to see
  • Visual distortions, flashes, or unusual visual experiences
  • Excessive cognitive fatigue in visually complex environments

Domain B. Visual-Spatial and Spatial Orientation Function

Potential indicators include:

  • Difficulty judging spatial relationships
  • Frequent collisions with objects or people
  • Inaccurate distance judgment
  • Spatial disorientation in unfamiliar environments
  • Getting lost easily
  • Difficulty locating objects accurately
  • Reaching errors
  • Problems navigating stairs
  • Difficulty functioning in crowded or visually complex environments
  • Significant decline in performance under visual complexity

Domain C. Visual Comfort and Reading Function

Potential indicators include:

  • Visual fatigue during reading
  • Headaches associated with reading
  • Head tilting during reading
  • Occluding one eye while reading
  • Slow reading speed
  • Skipping words or lines
  • Reliance on finger tracking
  • Re-reading for comprehension
  • Reduced reading comprehension efficiency
  • Reduced attention during prolonged reading
  • Avoidance of reading activities
  • Irritability following visual tasks

Domain D. Visual Attention and Behavioral Regulation

Potential indicators include:

  • Reduced sustained visual attention
  • Increased distractibility in visually busy environments
  • Rapid fatigue during visual tasks
  • Behavioral deterioration following prolonged visual demand
  • Emotional dysregulation after visual activities
  • Avoidance of visually demanding tasks
  • Difficulties with simultaneous visual processing
  • Increased emotional stress under visual load

Domain E. Visual-Spatial and Visuomotor Integration

Potential indicators include:

  • Copying difficulties
  • Inconsistent handwriting size and organization
  • Frequent copying errors
  • Poor hand-eye coordination
  • Clumsy motor performance
  • Difficulty catching or throwing objects
  • Impaired visually guided movement
  • Poor directional awareness

5. Auditory Processing Risk Indicators

Because neurovisual and auditory processing difficulties frequently coexist, screening should also consider auditory processing concerns.

Auditory Attention and Comprehension

Potential indicators include:

  • Difficulty sustaining attention to speech
  • Reduced listening endurance
  • Difficulty following complex verbal instructions
  • Delayed responses to spoken information

Auditory Filtering and Environmental Adaptation

Potential indicators include:

  • Difficulty understanding speech in classrooms
  • Significant impact of background noise
  • Overwhelm in noisy environments
  • Excessive sensitivity to sound
  • Difficulty following conversations involving multiple speakers

Auditory Memory and Language Integration

Potential indicators include:

  • Forgetting verbal information
  • Difficulty executing multi-step instructions
  • Frequent misunderstanding of spoken language
  • Understanding instructions but struggling to implement them

6. Professional Notes

Individuals with normal or near-normal visual acuity may nevertheless present with:

  • Neurovisual dysfunction
  • Binocular vision dysfunction
  • Visual-spatial impairment
  • Spatial localization deficits
  • Egocentric localization dysfunction
  • Hemispatial neglect
  • Visuomotor integration difficulties
  • Auditory processing disorders
  • Multisensory processing difficulties in complex environments

These difficulties may significantly affect:

  • Learning and academic performance
  • Occupational performance
  • Community participation
  • Mobility and safety
  • Environmental navigation
  • Emotional regulation
  • Neurorehabilitation outcomes
  • Daily living activities

When such risk factors are present, further assessment should be considered.

7. Referral Recommendations

Depending on clinical presentation, referral may be appropriate to:

Ophthalmology

For evaluation of ocular disease and basic visual function.

Neurovisual Medicine Services

For comprehensive neurovisual assessment.

Otolaryngology (ENT)

For hearing-related evaluation.

Auditory Rehabilitation Services

For auditory processing assessment.

Pediatric Rehabilitation Medicine

For developmental and functional evaluation.

Neurorehabilitation Services

For comprehensive neurological assessment.

Psychology and Mental Health Services

For attention, behavioral, and emotional assessment.

Educational Support Services

For learning support and school participation assessment.

8. The Vision-MDT® Perspective

Vision-MDT® promotes an interdisciplinary approach to understanding how visual and sensory information processing influences learning, behavior, spatial function, participation, and rehabilitation outcomes.

Vision-MDT® recognizes that visual function is not solely an ophthalmic concern. It is an integral component of brain function and human performance.

Through collaboration across disciplines, professions, institutions, and environments, Vision-MDT® seeks to provide more comprehensive, continuous, and individualized functional support for children and adults living with neurovisual challenges.

Vision-MDT® Principle

Seeing is not the destination.

Understanding visual function is where meaningful intervention begins.

Let vision become a window into human development.

Let collaboration become a pathway toward better functional outcomes.