the area to be ablated or eroded preferably in a distributed sequence a single laser pulse of sufficient power to cause ablation creates a micro cloud of ablated particles which interferes with the next laser pulse if located in the same or immediate point to avoid this interference the next laser pulse is spatially distributed to a next point of erosion or ablation that is located a sufficient distance so as to avoid the cloud of ablated particles once the cloud is dissipated another laser pulse is made adjacent the area prior eroded so that after the pattern of shots is completed the cumulative shots fill in and complete said pattern so that the desired shape of the object or cornea is achieved in operation of the beam delivery portion of system 5 laser source 500 produces laser beam 502 which is incident upon projection optics 510 projection optics 510 adjusts the diameter and distance to focus of beam 502 depending on the requirements of the particular procedure being performed for the illustrative example of an excimer laser used in the prk or ptk procedure projection optics 510 includes planar concave lens 512 and fixed focus lenses 514 and 516 as shown in the sectional view of fig2 lenses 512 and 514 act together to form an a focal telescope that expands the diameter of beam 502 fixed focus lens 516 focuses the expanded beam 502 at the.