Christine Roman-Lantzy has done much research in the area of Cortical Visual Impairment. In her 2003 book, "Cortical Visual Impairment: An Approach to Assessment and Intervention", she identifies the cause of CVI can generally be thought of as conditions that affect the visual pathways or visual processing centers of the brain. It is a condition in which children have reduced visual acuity as a result of damage to posterior visual pathways. In most cases, the eyes of such children are structurally normal, yet they have diminished visual capacity. She indicates that the most common conditions associated with a diagnosis of CVI are asphyxia, perinatal hypoxic-ischemic encephalopathy, intraventricular hemorrhage, periventricular leukomalacia, cerebral vascular accident, central nervous system infection, structural abnormalities, and trauma. She further states that the occipital lobes of the cerebral cortex at the back of the brain are primarily concerned with vision; the visual messages from the eye traveling along the optic nerve pathway in the form of electrical signals are routed to this location.
Since the time Christine Roman-Lantzy wrote her original book in 2003, there has been much research and additional books published on this brain-based visual impairment. Cortical Visual Impairment it is now more widely referred to as Cerebral Visual Impairment as studies have shown it can be a result of injury to other parts of the brain and not just the visual cortex. 

Diagnosing CVI

When CVI is suspected, a review of medical and other records is needed. ​While CVI may suspected by a Teacher of Students with Visual Impairments, it cannot be diagnosed by a teacher. It must be diagnosed by a medical doctor, typically this will be an ophthalmologist, neuro-ophthalmologist, or neurologist. After the diagnosis, a Teacher of the Visually Impaired (TVI) or an Orientation & Mobility Specialist (O&M) can help the team develop an appropriate plan that includes interventions and adaptations that meet the individual student's needs. The Pediatric cortical Visual Impairment Society has information on their website specifically for medical doctors to assist in the process of diagnosing CVI. 

The CVI Range

Dr. Roman-Lantzy developed the CVI Range© to assess the degree of impact on visual functioning of an individual with CVI. The CVI Range© evaluates the extent to which following 10 characteristics of CVI interfere with the individual's use of vision. In general, the greater the severity of CVI, the greater the number of CVI characteristics present.  However, these characteristics may change or improve. 
  1. strong color preference, especially for red or yellow
  2. need for movement to elicit or sustain visual attention; either the viewer or the object viewed needs to be moving to maximize the viewer's ability to view the object
  3. visual latency - delayed responses in looking at objects
  4. visual field preferences - the presence of unusual field locations in addition to loss of visual field.
  5. difficulties with visual complexity - difficulty when an object itself presents a complex display when an object is viewed within an environment that presents a complex display, or when an object is viewed at the same time that other sensory input is competing for the viewer's attention and ability to manage sensory stimuli.
  6. light-gazing and non-purposeful gaze
  7. difficulty with distance viewing
  8. absent or atypical visual reflexes - the reflex to blink in response to an approaching object is impaired
  9. difficulty with visual novelty - a preference for viewing familiar objects is shown
  10. absence of visually guided reach - the ability to look at and touch an object at the same time is not displayed, and these two actions are performed separately.

Matt Tietjen's "What's the Complexity?" Framework

The What's the Complexity assessment developed by Matt Tietjen, evaluates the complexity of the learning materials and environment and what is most accessible for learning. 

Dr. Gordon Dutton's Visual Skills Inventory

This visual skills inventory developed by Dr. Gordon Dutton is designed for parents. It guides parents in answering questions about the child's visual attention, visual field function, attention to light, distance attention, visually based interactions with people, perception of movement, difficulties with visual complexity difficulties with other senses, and difficulty with visually guided movement and visual recognition. 

The Perkins CVI Protocol

The Perkins School for the Blind is in the process of developing a new digital assessment system and educational roadmap for the whole child. While it is still in development, the following 16 characteristics of CVI can be found on their CVI NOW website:
  1. Visual Attention (ability to maintain gaze in cluttered and un-adapted environments)
  2. Visual Recognition (ability to visually recognize known items)
  3. Impact of Clutter/Crowding/Spacing (assessment of the number of items individual can tolerate in a display or spacing needed between items)
  4. Visual Field Abilities (ability to recognize materials in all visual fields)
  5. Impact of Color (How individual uses color as an overall strategy to understand the world)
  6. Form Accessibility (Individual might see 3-D items, but not recognize photos or line drawings)
  7. Visual Guidance of the Upper Limbs (reaching while maintaining visual attention)
  8. Visual Guidance of the Lower Limbs (ability to step accurately or place foot accurately such as into a shoe or on a curb)
  9. Access to People (ability to look at faces or recognize faces)
  10. Impact of Light (distraction of light or need for light, or need for backlighting)
  11. Response Interval (degree of delay in visual attention or recognition)
  12. Impact of Motion (need for motion to gain visual attention)
  13. Sensory Integration and Impact on Vision 
  14. Visual Curiosity (able to learn incidentally from distance materials or events)
  15. Appearance of the Eyes (alignment of eyes and eye preference)
  16. Movement of the Eyes (ability to move the eyes in different directions).

CVI Book Resources

A list of resource books specific to Cerebral Visual Impairments can be found on the VI Resource Books page.

Online CVI Resources

The American Printing House for the Blind has a great CVI website with information on Cortical Visual Impairment. Information includes articles, videos, stories, as well as supports, strategies and resources.
The American Foundation for the Blind provides useful articles on Cortical/Cerebral Visual Impairment:
CVI Scotland is devoted to helping people understand cerebral visual impairments, and together work towards developing the understanding of this complex condition. They have created a free reading tool named "Look," a reading tool, with multiple functions and settings, designed to make reading easier for people with CVI.  
Little Bear Sees is a website dedicated to raising awareness about cortical visual impairments. It is designed to provide the information and tools necessary for helping children with CVI learn how to see.
Perkins CVI NOW offers  information and resources specific to CVI. They also offer CVI trainings.
The Texas School for the Blind offers comprehensive resources on Cortical Visual Impairment through their SenseAbilities page.

Helpful CVI Resources

Roman Word Bubbling Tool. This tool is an open source project designed to assist in literacy education for students with CVI. It was developed in cooperation with Dr. Christine Roman-Lantzy who originally developed the technique.
Salient Features Dictionary The Salient Features Dictionary is based on the work and ideas of Christine Roman-Lantzy, Ph.D. Dr. Roman-Lantzy defines salient features as, "the defining elements that distinguish one target from another." (Roman-Lantzy, p204). "They are," she continues, "the key pieces of distinct information that facilitate recognition of an image, object, environment, or person" (Roman-Lantzy,  2018). 

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