[Intraocular lens power calculation after corneal photorefractive surgery. Literature review]

Revision of methods for estimating corneal power (Kpost) and effective lens position (ELP) for cataract surgery after corneal refractive surgery.

Review of medical literature.

To calculate the intraocular lens that achieves emetropia after corneal refractive surgery it is necessary to correct the Kpost and to estimate the effective lens position again correcting it. There are different formulae depending on the available information. Ideally, we need pre (Kpre) and post-treatment keratometry record (Kpost) and pre (Rpre) and post (Rpost) refraction. In this way, we can use the Aramberri's double-K method in the formula for calculating intraocular lens power.

Previously to keratorefractive procedure is advisable to have pre-treatment refraction and keratometry (K and method) registered: Kpre value is critical to calculate the ELP.