title: Contact glasses for use with high power lasers. Two new contact glasses for microsurgery at the iris, in the pupillary and the retropupillary space.
abstract: Two new contact glasses, one for irradiation of the iris and the other for irradiation of pathological structures within the pupillary and retropupillary regions are described. First order geometric considerations using the Young-Weierstrass imaging theorem indicate nearly aberration-free, stigmatic focussing, even for large numerical apertures. For surgical tasks utilizing high-power lasers, excellent focussing of strongly convergent ray-bundles which lead to small focus diameter and large diameters while passing through the pre-focal optical media are seen to be essential. Thus the efficiency of the laser-surgical treatment, its reliability, as well as security and harmlessness within the pre-focal media are increased.
mesh_terms: D006801:Humans; D007498:Iris / Q000601:surgery*; D053685:Laser Therapy; D007909:Lenses; D008866:Microsurgery / Q000295:instrumentation*; D009885:Ophthalmology / Q000295:instrumentation*; D055095:Optics and Photonics; D011680:Pupil