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GENERAL INFORMATION ON USAGE AND MAINTENANCE
OPERATION PRINCIPLE
The patient's eye is illuminated by near infrared light, which is emitted by the fundus observation illumi-
nation (IR LED). The fundus observation/photography optical system forms an image on the fundus
observation camera, and the image is observed on the touch display (color LC monitor). By operating
the photography button, the patient's eye is illuminated by the light emitted by the fundus photography
illumination (xenon lamp). The fundus observation/photography optical system forms an image on the
color photography camera and the image is photographed.
FA photography is conducted by inserting an Ex filter (which selects and transmits the light exciting flu-
orescent coloring matter) into the illumination optical system and inserting a Ba filter (which selects and
filtrates the fluorescent wavelength) into the observation/photography optical system. The FA/FAF
photography camera, which is built in the fundus observation/photography optical system, takes a pic-
ture. (Only in DRI OCT-1 Model Triton plus)
FAF photography is conducted by inserting an Ex filter for FAF photography (which selects and trans-
mits the light exciting the autofluorescence) into the illumination optical system and inserting a Ba filter
for FAF photography (which selects and filtrates the fluorescent wavelength) into the observation/pho-
tography optical system. The FA/FAF photography camera, which is built in the fundus observation/
photography optical system, takes a picture. (Only in DRI OCT-1 Model Triton plus)
The fundus/anterior segment tomogram is obtained by using the optical interference phenomenon.
Near infrared light, which is emitted by the wavelength-variable light source is separated by the fiber
coupler. One portion of the separated light is guided to the reference mirror or prism and is reflected by
it, before returning to the fiber coupler. The other portion of the light is guided into the patient’s eye or
its cornea and is reflected by the fundus or cornea tissues, before returning to the fiber coupler. When
the two reflected portions of light join and overlap, an interference wave with differing amplitude is gen-
erated. This wave is received by the photodetector and is converted into the electrical signal. Arith-
metic processing is done for this signal to photograph and record the fundus/anterior segment
tomogram.
CHECKPOINTS FOR MAINTENANCE
1. Regularly maintain and check the instrument and its parts.
2. When using the instrument after a prolonged period of inactivity, confirm normal and safe operation
beforehand.
3. To take a good picture, be careful not to stain the objective lens with fingerprint or dust.
4. When this instrument is not in use, cap the objective lens and cover the instrument with the dust
cover.
5. When the objective lens is stained, clean it according to "CLEANING THE OBJECTIVE LENS" in
this manual.
