Abstract: The effect of posterior chamber intraocular lens（PIOL）implantation on the structure of anterior segment and its safety have been confirmed by a number of studies. With the passage of time, patients with PIOL implantation are faced with cataract. The calculation of intraocular lens (IOL) before cataract surgery is an important factor to obtain good visual quality. The anterior chamber depth, anterior chamber volume and chamber angle parameters values after PIOL implantation in phakic eyes were significantly different from preoperative values. A few of studies have shown that there was no significant difference in the axial length and keratometry measured by IOL-Master, and in the IOL power calculated using different formulas before and after PIOL implantation. The IOL power before cataract surgery often needs to be measured by A ultrasound because of the opacity of refractive medium. The effect of PIOL implantation on A ultrasound biometric measurement in phakic eyes has not been concluded, so more studies are needed to complete the conclusion of the effect of PIOL implantation on the calculation of the IOL power, to provide reference for the treatment of cataract after the PIOL power implantation.(Int Rev Ophthalmol, 2021, 45: 317-321)

Key words: phakic intraocular lens, intraocular lens power calculation, optical biometry measurement