Accuracy of optical biometry combined with Placido disc corneal topography for intraocular lens power calculation

نویسندگان

  • Giacomo Savini
  • Kenneth J. Hoffer
  • Piero Barboni
  • Nicole Balducci
  • Domenico Schiano-Lomoriello
  • Pietro Ducoli
چکیده

PURPOSE To investigate the accuracy of a new optical biometer for intraocular lens (IOL) power calculation in eyes undergoing cataract surgery. METHODS Consecutive eyes of patients undergoing cataract surgery with the same IOL model were enrolled in a prospective cohort study. Axial length (AL) and corneal power were measured with an optical biometer based on optical low-coherence interferometry and Placido-disc corneal topography. IOL power was calculated with the Hoffer Q, Holladay 1 and SRK/T formulas. For each formula the lens constant was optimized in retrospect in order to achieve a mean prediction error (PE) of zero (difference between the predicted and the postoperative refraction). Median absolute error (MedAE) and percentage of eyes with PE ±0.50 D were calculated. RESULTS Seventy-four eyes of 74 cataract patients were enrolled. The MedAE was 0.25 D with all formulas. A PE within ±0.50 D was obtained in 89.04% of cases with the Hoffer Q and SRK/T formulas, and in 87.67% of cases with the Holladay 1 formula. CONCLUSIONS The optical biometer investigated in the present study provides accurate measurements for IOL power calculation.

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عنوان ژورنال:

دوره 12  شماره 

صفحات  -

تاریخ انتشار 2017