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Interpupillary index: a new parameter for hypo-hypertelorism.

C Evereklioglu1, S Doganay, H Er

  • 1Department of Ophthalmology, Inönü University Medical Faculty, Turgut Ozal Medical Centre, Research Hospital, Turkey. evereklioglu@hotmail.com

Journal of Cranio-Maxillo-Facial Surgery : Official Publication of the European Association for Cranio-Maxillo-Facial Surgery
|September 20, 2001
PubMed
Summary
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A new interpupillary index accurately identifies ocular hypo-hypertelorism. This clinical index, derived from interpupillary distance and fronto-occipital circumference, aids in diagnosing conditions like 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.

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  • 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.