A system and method are provided for altering the optical characteristics of an Intraocular Lens (IOL), in situ, using laser techniques. Specifically, a computer-controlled laser unit either creates microbubbles, or converts inclusions, inside the IOL, to establish a predetermined optical barrier having a predetermined opacity. The resultant optical barrier is oriented in the IOL to control light passing through the IOL, and to thereby minimize or correct adverse optical effects that would otherwise be present.
