| 摘要 |
In a photographing optical system, an autofluorescence barrier filter having a characteristic of transmitting a light having an autofluorescence wavelength and a near-infrared wavelength, and a near-infrared light cut-off filter having a characteristic of transmitting the visible light and blocking the near-infrared light are disposed to be replaceable. In the case of observing a fundus, the fluorescence barrier filter is inserted into an optical path in an observation photographing optical system, so that observation can be performed by using a near-infrared illuminating light. In the case of autofluorescence photographing, the photographing can be performed without filter switching. In the case of color photographing, at the time of observation, the observation is performed using the fluorescence barrier filter, and at the time of photographing, the photographing can be performed using the replaced infrared light cut-off filter.
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