Abstract

MIRANDA CARRACEDO, Anneé et al. Personalization of constants in the intraocular lens calculation formulas. Rev Cubana Oftalmol [online]. 2012, vol.25, n.2, pp. 180-191. ISSN 0864-2176.

Objective: to personalize the A, surgeon factor and anterior chamber depth constants for intraocular lens calculation formulas in the cataract surgery at the “Ramón Pando Ferrer” Cuban Ophthalmological Institute from May 2007 to January 2011. Method: a retrospective and descriptive study was made to study the A constant, the surgeon factor and the anterior chamber depth. Additionally, the preoperative axial length was evaluated by IOL Master, as well as the best uncorrected visual acuity, the expected and the obtained spherical component, and the refractive results. Results: the constants optimized by the partial coherence interferometry were different from those suggested by the intraocular lens manufacturers. These customized constants for each surgeon did not show significant differences among them. The optimized constants according to the axial lengths showed significant differences in the three study groups. The difference between the implanted lens and the estimated lens based on the new constants was lower than one dioptre of error in 83.1 % of patients. Good visual correction in relation with the difference between the expected and the final refractions was attained in 75.4 % of patients. Conclusions: the partial coherence interferometry-optimized constants showed higher values than those suggested by the manufacturer. The constant optimization for the intraocular lens calculation by IOL Master allows, according to the ocular individual features (axial length), using the adequate formula and increasing the predictability of postoperative refractive results.

Keywords : intraocular lens calculation; IOL Master; A constant; surgeon factor; anterior chamber depth.

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