Spot-lights for eye surgery.

Although operating microscopes are readily available in ophthalmic operating theatres certain procedures are more conveniently done without them and some surgeons prefer spot-lights rather than the large shadow-free theatre lamps. Single or twin spot-lights, unlike the large theatre lamps, produce little reflection off such tissues as the cornea which could obscure details of structures behind. Spot-lights can also be placed at a more satisfactory angle than large theatre lamps. Some models of the Zeiss (Oberkochen) operating microscopes have twin larnps in supports which hold them obliquely in a fixed position where they illuminate the field of the microscope. These larnps provide a bright and evenly lit circle of illumination and make excellent spot-lights for eye surgery for those procedures where the microscope is not