Interpupillary index: a new parameter for hypo-hypertelorism

Area of Science:

• Ophthalmology and Clinical Genetics
• Pediatric Ophthalmology
• Craniometry

Background:

• Hypertelorism and hypotelorism are conditions affecting eye spacing, often associated with various congenital anomalies.
• Accurate clinical assessment is crucial for diagnosis and management.
• Existing methods may lack precision in differentiating subtle variations.

Observation:

• A cross-sectional study included 310 children aged 7-15 years, comprising those with hypertelorism, large fronto-occipital circumference (FOC), and normal controls.
• Interpupillary distance (IPD), inner and outer intercanthal distances, and FOC were measured.
• A novel 'interpupillary index' was calculated as (IPD/FOC) * 100.

Findings:

• Children with hypertelorism exhibited significantly larger IPD and FOC compared to controls.
• The new interpupillary index was significantly higher in children with hypertelorism (11.80 ± 0.45) than in macrocephalic (10.76 ± 0.50) and control groups (10.79 ± 0.35).
• Intercanthal distances and indices were also significantly larger in hyperteloric children.

Implications:

• The proposed interpupillary index offers a more accurate and practical method for evaluating ocular hypo-hypertelorism.
• This index can aid clinicians in the precise diagnosis of conditions characterized by abnormal eye spacing.
• Further research may validate its utility across diverse pediatric populations and syndromic conditions.