broken bond
4.Using the new excimer laser photorefractive keratectomy(PRK),the molecular bond of the corneal stroma is broken to allow recofiguration of the cornealsurface.This photo-ablation effect can treat severe myopia,astigmatism,and a variety of corneal diseases using photo-therapeutic keratectomy(PTK).The safety,predictability,and long-term stability are well established in major western medical facilities.

