Higher Visual Function Deficits in Children With Cerebral Visual Impairment and Good Visual Acuity

Area of Science:

• Neuroscience
• Ophthalmology
• Developmental Pediatrics

Background:

• Cerebral Visual Impairment (CVI) is often diagnosed through observed behavioral deficits, despite normal visual acuity.
• Higher Visual Function Deficits (HVFDs) in CVI can be missed due to unimpaired visual acuity, leading to underdiagnosis and lack of understanding of visual perceptual difficulties.
• Accurate identification of HVFDs is crucial for understanding and managing CVI in children.

Purpose of the Study:

• To determine the spectrum of HVFDs in children with CVI compared to typically developing children using a structured questionnaire.
• To evaluate the efficacy of the Higher Visual Function Question Inventory (HVFQI-51) in detecting HVFDs in children with CVI.
• To identify a potential screening tool for HVFDs in children with CVI.

Main Methods:

• A prospective study administered the 51-question Higher Visual Function Question Inventory (HVFQI-51) to children with a history suggestive of brain damage and a CVI diagnosis, and to typically developing children.
• The study analyzed the spectrum of HVFDs, including the impact of an 'not applicable' response option.
• A subset of 11 questions (Top-11) was proposed as a potential screening tool.

Main Results:

• The HVFQI-51 effectively detected a range of HVFDs in children with CVI, even those with good visual acuity, and clearly distinguished them from typically developing children.
• HVFDs in the study group were predominantly linked to dorsal stream visual processing dysfunction, with individual variations observed.
• The inclusion of the 'not applicable' response provided a more accurate representation of each child's overall disability.

Conclusions:

• The HVFQI-51 is a valuable tool for identifying HVFDs in children with CVI and differentiating them from typical development.
• The proposed Top-11 subset shows potential as a screening tool for initial assessment of HVFDs and measuring CVI-related impairment, requiring further validation.
• Understanding HVFDs is essential for comprehensive CVI diagnosis and management.