Fundus photographing device
AssigneeNidek Co., Ltd.
InventorsShin Yoneya, Tsuguo Nanjo
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Abstract
A fundus photographing device for conducting infrared fluorescence photography on a fundus of an examinee's eye after intravenously injecting a fluorescent agent which emits fluorescence of an infrared region into veins is disclosed. This device includes an illumination optical system 1 for illuminating the fundus with exciting light, thereby exciting the injected fluorescent agent, the exciting light being of wavelengths in a wavelength region of not maximum absorption but maximum fluorescent intensity of the fluorescent agent.
Claims7
A fundus photographing device for conducting infrared fluorescence photography on a fundus of an examinee's eye after intravenously injecting a fluorescent agent, the fluorescent agent having a peak absorption wavelength region and emitting infrared fluorescence by exciting, the device including:
- an illumination optical system for illuminating the fundus with exciting light having a main wavelength shorter than the peak absorption wavelength region, thereby exciting the injected fluorescent agent, an amount of the emitted infrared fluorescence by the exciting light having the main wavelength shorter than the peak absorption wavelength region being larger than an amount of emitted infrared fluorescence by exciting light having a main wavelength within the peak absorption wavelength region;
- and
- a photographing optical system including filtering means for transmitting the infrared fluorescence emitted from the injected fluorescent agent and intercepting most of the reflected exciting light, and a photographing element for photographing an image of the fundus with the infrared fluorescence transmitted through the filtering means.
Dependencies are inferred from the claim text.