Patent ID: 6574432
Filing Date: 2003-06-03
Classification: A61B

Abstract:
A fundus camera for photographing a fundus of an eye to be examined, the fundus camera comprising:a first illumination optical system for illuminating the fundus with infrared illumination light, the first illumination optical system including a first light source; a second illumination optical system for illuminating the fundus with visible illumination light, the second illumination optical system including a second light source and an exciter filter for visible fluorescence excitation; a photographing optical system for photographing an image of the fundus with reflection light of the visible illumination light from the fundus, the photographing optical system including a photographing element; an observation optical system for observing the fundus in reflection light of the infrared illumination light from the fundus, the observation optical system including an optical path shared with the photographing optical system and an optical path branched from an optical path of the photographing optical system by a first wavelength-selecting mirror having a wavelength-selecting property of transmitting either an infrared wavelength range or visible wavelength range and reflecting the other; a barrier filter for transmitting fluorescence from the fundus as well as for cutting off reflection light of visible illumination light for fluorescence excitation which has resulted from or has been transmitted by the exciter filter, the barrier filter being disposed at least in the optical path of the photographing optical system; and a second wavelength-selecting mirror having a wavelength-selecting property of transmitting either the infrared wavelength range or the visible wavelength range and reflecting the other, the second wavelength-selecting mirror being disposed in an optical path shared between the first illumination optical system and the second illumination optical system so that optical axes of both the optical systems are coaxial with each other, and wherein the exciter filter is disposed in an optical path between the second wavelength-selecting mirror and the second light source.