1. A scanning system for treating a target tissue in a patient's eye, comprising:a first light source for generating a treatment light beam;
a second light source for generating an imaging light beam;
a scanner configured to deflect the treatment light beam to form a treatment pattern under the control of a controller, the scanner further being configured to deflect the imaging light beam; and
a delivery system configured to deliver the treatment light beam to the target tissue to form the treatment pattern, the delivery system being further configured to deliver the imaging light beam to the target tissue such that the imaging beam is indicative of a focal position of the treatment light beam, wherein the target tissue is selected from the group consisting of the lens, lens capsule, cornea, limbus and sclera of the patient's eye.