A mains electricity (AC-powered) device assembly in which input energy is used to excite an excimer gas to emit a high-power laser beam intended for corneal ablation (i.e., photorefractive keratectomy) and other ophthalmologic procedures (e.g., surgical creation of a communication between the lacrimal sac and the nasal cavity). It includes a light source and controls/foot-switch, and is typically coupled to a biomicroscope slit lamp or to an indirect ophthalmoscope by a flexible fibreoptic cable. It does not include femtosecond pulsing or fundus imaging technology.