PedsCases: Pediatric Education Online · PedsCases Team

Navigating Cerebral Visual Impairment (CVI) in Children

April 28, 2024·18 min·1 clip

A two-year-old with cerebral palsy can't make eye contact, but his eyes light up for red toys—what's causing this visual mystery?

This educational episode focuses on cerebral visual impairment (CVI), a brain-based visual disorder, using a clinical case of a two-year-old boy named Quinn. The host is a third-year medical student at Queen's University, and the content is created with developmental pediatrician Dr. Dawa Sandak. The episode aims to define CVI, list its causes, discuss diagnosis, and review its developmental impacts. CVI is defined as a visual impairment resulting from the brain's inability to process information from otherwise normal or near-normal eyes. The host explains the visual pathway, distinguishing the anterior (eye) from the posterior (brain) pathways. Potential causes include prematurity, stroke, brain malformation, hypoxic ischemic encephalopathy, and it often co-occurs with conditions like cerebral palsy. A 2022 definition from the American Association of Pediatric Ophthalmologists and Strabismus states CVI involves a normal eye exam but abnormal visual behavior due to neurological issues. The Perkins School for the Blind, with analysis from McKinsey & Company, found less than 20% of children with CVI are diagnosed. Common diagnostic characteristics include visual latency, difficulty with complex backgrounds, lower visual field loss, a need for movement, color preferences, light gazing, and a preference for familiar objects. A surprising insight is that CVI is the leading cause of childhood visual impairment yet remains under-recognized, with diagnostic obstacles including lack of provider familiarity and social factors like poverty. The case illustrates that a child like Quinn, who loves red toys but struggles in busy settings, may have his challenges misattributed to his cerebral palsy. Children with CVI are often misdiagnosed with conditions like ADHD or autism due to overlapping behavioral presentations. The host notes that in children with hypoxic ischemic encephalopathy, approximately 60% will develop CVI. Management is highly individualized, involving strategies like using high-contrast items, reducing clutter, and allowing extra response time. A multidisciplinary team including ophthalmologists, therapists, and educators is essential for support. The tone is instructional and narrative, blending a fictional patient case with clear, didactic explanations of medical concepts. The style is methodical and patient-centered, designed to simulate a clinical learning experience for trainees. This episode is ideal for medical students, pediatric residents, and healthcare professionals seeking a foundational understanding of CVI's presentation and management. Listeners interested in developmental pediatrics, neurology, or supporting children with visual impairments would find it valuable. Those seeking advanced, specialist-level detail or a debate on controversial topics might find the introductory scope too basic.

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