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Axial length estimation in strabismic patients

B J Kushner1, C O Qui, N J Lucchese

  • 1Department of Ophthalmology & Visual Sciences, University of Wisconsin, Madison, USA.

Journal of Pediatric Ophthalmology and Strabismus
|September 1, 1996
PubMed
Summary

A new formula estimates axial length in strabismic patients using age and refractive error. While useful when ultrasonography is unavailable, it

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Area of Science:

  • Ophthalmology
  • Pediatric Ophthalmology
  • Strabismus Surgery

Background:

  • Axial length is crucial for safe medial rectus recession in strabismus surgery.
  • Previous formulas for predicting axial length require validation in new patient cohorts.
  • Accurate axial length is vital for surgical planning and predicting outcomes in strabismic patients.

Purpose of the Study:

  • To validate a previously developed formula for estimating axial length based on age and refractive error.
  • To assess the formula's accuracy in a distinct patient population undergoing strabismus surgery.

Main Methods:

  • Axial length was measured using A-scan ultrasonography in 163 pediatric strabismus surgery patients.
  • Patients were stratified into two age groups: under 18 months and 18 months to 10 years.
  • Measured axial lengths were compared against estimations from a pre-existing formula.

Main Results:

  • In patients under 18 months, the formula estimated axial length within 1.5 mm in 93.1% of cases.
  • In patients aged 18 months to 10 years, the formula achieved 1.5 mm accuracy in 87.3% of cases.
  • Accuracy within 0.5 mm and 1.0 mm varied between the age groups but showed moderate predictive capability.

Conclusions:

  • The formula offers a potential tool for estimating axial length in strabismus surgery when ultrasonography is inaccessible.
  • It may be particularly beneficial for congenital esotropes requiring significant medial rectus recession in smaller eyes.
  • Direct A-scan ultrasonography remains the preferred method; the formula's accuracy is insufficient for intraocular lens power calculations.

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