Comparison of intraocular lens power prediction using immersion ultrasound and optical biometry with and without formula optimization

Gabor Nemeth, Attila Nagy, Andras Berta, Laszlo Modis

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14 Citations (Scopus)

Abstract

Purpose Comparison of postoperative refraction results using ultrasound biometry with closed immersion shell and optical biometry. Patients and method Three hundred and sixty-four eyes of 306 patients (age: 70.6±12.8 years) underwent cataract surgery where intraocular lenses calculated by SRK/T formula were implanted. In 159 cases immersion ultrasonic biometry, in 205 eyes optical biometry was used. Differences between predicted and actual postoperative refractions were calculated both prior to and after optimization with the SRK/ T formula, after which we analysed the similar data in the case of Holladay, Haigis, and Hoffer-Q formulas. Mean absolute error (MAE) and the percentage rate of patients within ±0.5 and ±1.0 D difference in the predicted error were calculated with these four formulas. Results MAE was 0.5-0.7 D in cases of both methods with SRK/T, Holladay, and Hoffer-Q formula, but higher with Haigis formula. With no optimization, 60-65 % of the patients were under 0.5 D error in the immersion group (except for Haigis formula). Using the optical method, this value was slightly higher (62-67 %), however, in this case, Haigis formula also did not perform so well (45 %). Refraction results significantly improved with Holladay, Hoffer-Q, and Haigis formulas in both groups. The rate of patients under 0.5 D error increased to 65 % by the immersion technique, and up to 80 % by the optical one. Conclusions According to our results, optical biometry offers only slightly better outcomes compared to those of immersion shell with no optimized formulas. However, in case of new generation formulas with both methods, the optimization of IOL-constants give significantly better results.

Original languageEnglish
Pages (from-to)1321-1325
Number of pages5
JournalGraefe's Archive for Clinical and Experimental Ophthalmology
Volume250
Issue number9
DOIs
Publication statusPublished - Sep 1 2012

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Keywords

  • IOL-constants
  • Immersion biometry
  • Optical biometry
  • Optimization

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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