[Calculation of the implant: is it a useless luxury?].

Analysis of the means by which accuracy of intraocular lens power calculation could be improved with theoretical and linear regression formulas. The postoperative refractive errors with the lenses selected by the surgeon were compared with those observed with the emmetropic calculated power lenses and with a standard 20 diopters lens. A consecutive series of 100 eyes with less than 4.50 diopters of pre-operative myopia or hypermyopia, is evaluated. Postoperative refractive errors are out of the range -4; +4 diopters in 6% for standard lens, 4% for actually implanted lens, and 1% for emmetropic power calculated lens.