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Session Title: New evaluation tools in refractive surgery
Session Date/Time: Sunday 06/10/2013 | 08:00-09:30
Paper Time: 08:57
Venue: Forum (Ground Floor)
First Author: : R.Rothwell PORTUGAL
Co Author(s): : L. Figueiredo C. Arźde
To determine the accuracy of different intraocular lens (IOL) power calculation formulae in eyes with high axial myopia.
Department of Ophthalmology, Centro Hospitalar de Vila Nova de Gaia/ Espinho, Portugal
Retrospective study. Sixty four eyes that underwent clear lens extraction (CLE) with IOL implantation in the capsular bag, whos axial length (AL) was greater than 25.0 mm. Study data was preoperative AL and keratometry measured by the IOLMaster and postoperative subjective refraction. Prediction error (PE) (formula-predicted refraction actual postoperative refractive error) and the mean absolute error (MAE) were back-calculated for the Haigis, SRK II, SRK/T, HofferQ and Holladay I formulae.
64 eyes were included for the calculation of SRK II, SRK/T, HofferQ and Holladay I formulae. The Haigis formula was calculated for 36 eyes. The SRK/T, HofferQ, Holladay I and Haigis formulae resulted in a slight tendency toward resultant hyperopia, with a of PE -0.14D, -0.63D, -0.50D and -0.28D, respectively and a MAE of 0.65D, 0.74D, 0.72D and 0.60D. The SRK II formula caused the largest error with 1.70D of MAE, with a myopic shift (PE = 1.28D).
Overall, the SRK/T, HofferQ, Holladay I and Haigis formulae performed well. The Haigis and SRK/T formulae provided the best predictive result in the refractive outcome of IOL implantation in long eyes.
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