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PLoS One. 2017 Feb 23;12(2):e0172634. doi: 10.1371/journal.pone.0172634. eCollection 2017.

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

Author information

1
Fondazione G.B. Bietti IRCCS, Rome, Italy.
2
Stein Eye Institute, University of California, Los Angeles, CA, United States of America.
3
St. Mary's Eye Center, Santa Monica, CA, United States of America.
4
Studio Oculistico d'Azeglio, Bologna, Italy.
5
Scientific Institute San Raffaele, Milan, Italy.

Abstract

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.

PMID:
28231267
PMCID:
PMC5322924
DOI:
10.1371/journal.pone.0172634
[Indexed for MEDLINE]
Free PMC Article

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