The percentage of eyes with an MAE of 0.75 D or greater was higher with the Scheimpflug-US combination (7 eyes, 17%) than with the corneal topography-US combination (2 eyes, 4.8%) or PCI (3 eyes, 7.3%).Ĭorneal power measurements with the Pentacam Scheimpflug system should be used in IOL power calculation formulas with caution because the accuracy is good but is not as high as with standard measurement methods.Īim To compare the outcomes of peripheral corneal relaxing incisions (PCRIs) based on standardized nomogram using keratometry from Scheimpflug and Placido machines during standard cataract surgery and to assess the astigmatism neutralization potential of PCRIs. The mean absolute error (MAE) of the Scheimpflug-US combination was good (0.44 diopters +/- 0.30 ) but significantly higher than the topography-US combination and PCI (0.33 +/- 0.29 D and 0.33 +/- 0.23 D, respectively) (P =. The mean arithmetic error was zero for all combinations of measurements due to constant optimization.
The prediction error was calculated as the difference between the predicted and the measured refraction 1 month postoperatively.įorty-one eyes were evaluated. Intraocular lens power was calculated by entering 3 combinations of data into the Hoffer Q formula: (1) corneal power measurements by corneal topography (simulated keratometry) and axial length (AL) measurements by Ultrascan ultrasound (US) immersion biometry (2) Scheimpflug corneal power measurements (simulated keratometry) and US AL measurements (3) corneal power and AL measurements by partial coherence interferometry (PCI) (IOLMaster). Studio Oculistico d'Azeglio, Bologna, Italy.Ĭonsecutive patients having phacoemulsification and in-the-bag IOL implantation were prospectively studied. To evaluate the accuracy of corneal power measurements by the Pentacam Scheimpflug system for intraocular lens (IOL) power calculation.
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