Centration and positional stability of intraocular lenses (IOLs) are crucial factors for optical quality and predictability of the result after IOL implantation. Continuous improvements of IOL design and materials, surgical techniques and measurement methods have contributed to an optimised correction of the presudophakic eye and to a better unterstanding of the effects of IOL positioning. With modern IOLs implanted into the capsular bag, positioning and stability comparable to the natural crystalline lens can be achieved.