“…Laser beams travel through the objective lenses and only microscope stage movement is required to adjust embryo position (Tadir et al, 1989(Tadir et al, , 1990(Tadir et al, , 1991. In contrast, contact laser systems require direct contact between the laser and embryo, usually with either glass or an optical fiber (Neev et al, 1992). This increases the likelihood of trauma to the embryo.…”