[Derivation and critical analysis of formulas for the calculation of the refractive power of intraocular lenses].

Using matrices, formulae are derived for calculating the refractive power of the ocular system and of intraocular lenses. These formulae take into account the finite extension of the lenses under consideration. They also contain only measurable quantities. Some sources of uncertainty in predicting the power of the IOLs are pointed out estimates of their orders of magnitude are given. By combining the new results with those obtained on the basis of regression analysis, the prediction of IOL power can be improved, especially for eyes with short axial length. In a critical comparison with formulae which are well known from the literature, a number of them were found to be incorrect. In conclusion, some suggestions are made for improving the prediction of lens power.