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Visual outcomes using Shammas method of IOL power calculation

Poster Details

First Author: O.Martinez SPAIN

Co Author(s):    D. Nahra   A. Martinez                 

Abstract Details


To describe the refractive outcome after uneventful cataract surgery in patients with prior myopic Laser-Assisted in Situ Keratomileusis (LASIK) using the Shammas method of intraocular lens (IOL) power calculation.


Parc de Salut Mar, Hospital de la Esperanza, Barcelona, Spain


Prospective study of 11 eyes with prior myopic LASIK and no preoperative corneal power data. All patients underwent uncomplicated phacoemulsification and IOL implantation calculated by the Shammas method. Three months after the surgeries, the main outcomes were measured. The optimum IOL was assessed using back-calculation, and this parameter was compared with the Shammas method and IOL Master Prediction IOL.


The mean postoperative spherical equivalent was -0.88D ± 0.79, (range -1.87D to +0.63 D). Mean arithmetic prediction error for the target refraction was 0.38 ±0.79. A total of 72.7% of eyes achieved visual outcomes within ± 1.0 D of target refraction. The Shammas method vs. optimum IOL shows a slight overestimation of 0.59±1.56 (p=0.328).


The Shammas method could be useful for calculating IOL power in these cases because of the simplicity of the formula, an acceptable spherical equivalent and good percentage of eyes within within ±1D refractive prediction error.

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