Preoperative Biometry in Jos

  • OO Adenuga
  • CD Mpyet
  • OE Babalola
  • MR Chiroma
Keywords: biometry, intraocular lens, keratometry

Abstract

Purpose: To assess the accuracy of preoperative biometry in predicting emmetropia and evaluate the visual outcome following cataract surgery with intraocular lens (IOL) implantation in eyes that had biometry.
Methodology: This is a hospital based retrospective study of eyes that had preoperative biometry at the Jos University Teaching Hospital, Jos in Plateau State, north-central Nigeria from February 2005 to January 2007.  Children, patients with complicated and traumatic cataracts, patients with coexisting ocular morbidity, patients with difficult keratometry and patients with grade 3 intraoperative complications were excluded from the study. The SRK II formula was used in determining the IOL power necessary to achieve emmetropia. The visual outcomes at discharge and at 1 week as well as the refraction results at 6 weeks were all recorded. The accuracy of biometry was determined at 6 weeks.
Results: Five hundred and sixty eight eyes had cataract extraction during the study period but only 300 eyes (53%) of 286 patients met the study criteria and were analysed. One hundred and sixty five eyes (55%) had documented refractions at 6 weeks. Sixty one percent of eyes refracted were within ±1D of the intended refraction while 88% were within ± 2D. Proportion of eyes with a good outcome increased from 40% before correction to 83% with correction at 6weeks.
Conclusion: Preoperative biometry in Jos achieved a fairly good degree of accuracy. Retraining of residents who perform biometry as well as periodic monitoring of the accuracy of measurements is recommended for better results.
Section
Articles

Journal Identifiers


eISSN: 2276-7096