The present invention relates to a femtosecond laser ophthalmological apparatus (10) and method that creates a flap on the cornea for LASIK refractive surgery or for other applications that require removal of corneal and lens tissue at specific locations, such as in corneal transplants, stromal tunnels, corneal lenticular extraction and cataract surgery. The femtosecond laser (15) beam is transferred from the main cabinet (11) to a hand piece module (17) via a rotating mirror set module (16). In the hand piece (17), the femtosecond laser (15) beam is scanned and guided to a patients eye (23). The ablation pattern is based on dividing the area of the ablation area into a matrix grid (32) made up of cells (31). Predetermined ablation pattern (33,35) is completed in an individual cell (31) before moving on to the next cell until ablation is complete in the entire matrix grid (32) mapped on the ablation area.
