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- Adjust the height of the examinee’s eye
Have the examinee sit and place their face against the chin rest and forehead rest
Adjust the height of the chin rest by turning the chin rest height adjustment ring so that the eye of the examinee is aligned with the height adjustment mark on the face rest pole.
- Slide the operation lever to the side of the eye to be photographed
- Position the pupil
(1) Looking at the monitor, turn the height adjustment ring and incline the operation lever right or left so that the eye front image is displayed almost at the center of the monitor. Adjust the height of the chin rest by turning the chin rest height adjustment ring as required. Hold the operation lever and slide the stage if you need to move the unit more.
(2) Have the examinee stare at the internal eye fixation target.
(3) Incline the operation lever back and fourth until the split images of the pupil are aligned.
*If the pupil is smaller than the inner alignment ring:
Darken the room more in order to hasten the dilation.
If pupil is still smaller, use the “S.P Function”
- Display the retinal image
Press ALIGNMENT switch. Eye fixation target will blink for three seconds. IF the stage is slid to the opposite side when the retinal image is displayed, the display will change to eye from image.
- Adjust the brightness for observation
Looking at the monitor, adjust the brightness by turning the LAMP knob.
Adjust the brightness and contrast of the monitor by using the monitor adjusting knob as required
NOTE: It will be difficult to see the working distance dots and split bars during observation of retinal image if the brightness is set too high.
- Have the examinee place their face firmly. against the forehead rest and chin rest.
- Determine the are to be photographed
(1) Have the examinee stare at the eye fixation target. If the examinee has difficulty viewing the eye fixation target, press the eye fixation target control button vertically. Eye fixation target will blink for two seconds.
(2) Incline the fixation target control button to move the eye fixation target to the position where you wish to induce the examinee’s eye, as required.
- Align the split bars
Align the split bars by turning the focus knob.
Focusing is correct when the split bars are aligned.
If split bars do not align:
Diopter of the examinee’s eye is out of the range from -12D to +15D. In this case, pull out the diopter compensation slider. If it is pulled out one step, – (minus) lens will be set, and if it is pulled out two steps, + (plus) lens will be set. Whenever it is pulled out, split bars will disappear. Turn the focus knob and focus on the retinal image.
Precisely adjust the position of retinal image
Incline the operation lever forward and backward so that both working distance dots are displayed the smallest. Also, precisely adjust the position of the working dots so they are equally position from top and bottom, and from right and left.
NOTE: Unless the retinal image is positioned properly, flare will appear in the periphery of the retinal image when the image is taken
- Press shutter release button
After image is taken, eye front image will be displayed. In stereo mode, however, the retinal image remains displayed
(1) Be sure to view photographed image with an image viewer such as the CR-DGi Image Viewer, available as an accessory.
(2) The image displayed on the LCD monitor of the digital camera comprises data still in the process of forming an image. Thus, the image inverted 180°, and there may be flaring on its periphery. Use the image on the LCD monitor only for checking if the examinee has blinked or not.
(3) Image must be printed from an image viewer such as the CR-DGi Image Viewer, available as an accessory. Do not print the image directly from the digital camera, as that is not the final image.
If you are taking an image of the other eye
Both eyes will be contracted after an image is taken. Wait until the eye is sufficiently dilated. Then, take an image.
Settings concerning spilt bars and position of internal eye fixation target can be made in SET mode.
- Press the button under “SET” in eye front image screen.
- SET mode screen will appear.
- Press the button under “EXIT” after the settings are completed. Settings will be saved, and display will return to eye front image screen.
Selecting Whether to Display Split Bars
Select whether to display split bars which are used for focusing on the monitor.
- Press the button under the “SPLIT” to change the settings.
Selecting Whether to Reset the Position of Eye Fixation Target
Select whether to have the eye fixation target return to the standard position after each photograph.
- Press the button under “REST” to change the setting.
Resetting the Position of Eye Fixation Target
You reset the eye fixation target when you cannot find the initial position when RESET is set to OFF.
- Press the button under “POSITION RESET”. The target returns to the initial position and the display will return to eye front image screen.
NOTE: If whether to display split bars or whether to reset the position of eye fixation target has been changed prior to resetting the position of eye fixation target, the change will be applied on pressing the button under “POSITION RESET”.
If the pupil is smaller than the inner alignment ring even after waiting for a while in a dark room, use the S.P function. Even an eye whose pupil as small as 3.7mm in diameter will be able to be photographed.
NOTE: DO not use this function for taking an image of a fully dilated eye. Otherwise, you will not be able to take an image of proper density due to excessive exposure.
(1) Set S.P knob to “ON”
NOTE: Unless “I” mark on the knob is properly aligned with “ON” or “OFF” mark on the instrument, darkness of image may be uneven.
(2) Press ALIGNMENT switch to display the retinal image.
Area that will be photographed will be indicated by dotted circle.
NOTE: Flare may appear outside the dotted circle.