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Predicting sulcus size using ocular measurements.

M Pop1, Y Payette, M Mansour

  • 1Michel Pop Clinics, 9001 l'Acadie Boulevard North, Suite 900, Montreal, Quebec H4N 3H5, Canada.

Journal of Cataract and Refractive Surgery
|August 8, 2001
PubMed
Summary
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Ocular measurements, including corneal power and refractive error, can predict sulcus size. Traditional limbal measurements are insufficient for accurate sulcus size prediction in ophthalmology.

Area of Science:

  • Ophthalmology
  • Biometry
  • Ocular measurements

Background:

  • Accurate prediction of sulcus size is crucial for intraocular lens implantation.
  • Traditional methods relying solely on limbal measurements have shown limitations.

Purpose of the Study:

  • To develop and validate a predictive formula for sulcus size using ocular biometry.
  • To assess the efficacy of various ocular measurements in predicting sulcus size.

Main Methods:

  • Evaluated 43 eyes using ultrasound biomicroscopy (UBM) and contact ultrasonography.
  • Measured anterior chamber depth (ACD), sulcus size, corneal thickness, limbus size, axial length, and corneal power.
  • Employed regression analysis to establish a predictive formula for sulcus size.

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Main Results:

  • A predictive formula for sulcus size was derived: Sulcus size = 18.9 - 0.023 x sphere + 0.15 x mean keratometry (R = 0.49; P = .005).
  • Ultrasound and UBM ACD measurements showed strong correlation (R=0.76, P<.001).
  • Ultrasound and UBM pachymetry measurements were also highly correlated (R=0.69, P<.001).

Conclusions:

  • Limbal measurements alone are inadequate for predicting sulcus size.
  • A formula incorporating refractive error (sphere) and mean corneal power provides a more accurate prediction of sulcus size.
  • The standard error for sulcus size measurement by UBM was 0.4 mm.