Patent ID: 7385757
Filing Date: 2008-06-10
Classification: G02B

Abstract:
1. A surgical microscope for ophthalmology for examining only a transparent structure of a human eye, the surgical microscope comprising: a tubular unit; a main objective disposed downstream of said tubular unit; said tubular unit defining a viewing beam path passing through said main objective so as to permit viewing said transparent structure of the human eye; an illuminating system defining an illuminating beam path leading to a surgical area of said transparent structure and continuously illuminating the same; said illuminating system including a xenon illuminating light source or a metal halide light source for generating illuminating light containing light in the visible wavelength range and light in the ultraviolet wavelength range; and, at least one block filter arranged in said illuminating beam path and said block filter having a cutoff wavelength selected to filter out said light in the ultraviolet wavelength range and to at most insignificantly attenuate said light in said visible wavelength range thereby reducing phototoxicity of said illuminating light to the human eye and providing an illuminating light similar to sunlight in the visible spectral range to said transparent structure.