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- Turn ON the computer, and start the control software
- Turn ON the power of the main unit – press the power switch to the I side.
- The anterior eye observation screen is displayed on the monitor.
- Unlock the stage unit – press the stage unit lock button to release the lock.
- Adjust the height of the main unit – turn the operation lever, and align the main unit with the center position of the height adjustment mark.
- Darken the room so there is barely enough light (approx. 5 lux) by which to read a newspaper
- Input the study information into the computer – use the control software to input the study information.
- Disinfect the face rest, and replace the chin rest paper.
- Have the patient sit down and place their chin against the chin rest and their forehead against the forehead rest.
- Align the height of the patient’s eye – move the chin rest up or down so that the patient’s eye is aligned with the height adjustment mar by operation the CHIN REST switches.
- Display the patient’s eye to be photographed on the monitor – hold the operation lever, pull it towards you, and then move it in the directions of the eye to be photographed.
- Align the position of the pupil
(1) Use the operation lever to adjust the anterior eye image so that it is displayed more or less in the center of the monitor. If the image cannot be adjusted in the up/down direction, use the CHIN REST switch to move the patient’s face up or down.
(2) Have the patient stare at the flashing eye fixation lamp (green)
Note: When observing the anterior eye, it may not be possible for a patient requiring high diopter correction to see the eye fixation lamp.
(3) Tilt the operation lever forward or backward so that the image of the pupil which have been split into the top and bottom are aligned. For coarse moments in the front/back direction, move the stage unit back or forth while holding the operation lever.
Note: If the pupil is smaller than the inside pupil position alignment mark – darken the room further to dilate the pupil more. If the pupil still does not become larger, use the SP function.
Note: Concerning the SP function – use the SP (small pupil photography) function if the pupil of the patient’s eye fails to become larger than the inside pupil position alignment mark even after waiting for a while in the darkened room. This function enables pupils with a diameter down to 3.7mm to be photographed.
(1) Press the SP switch on the operation panel.
(2) Press the ALIGNMENT switch and display the retinal image on the monitor. The photography range is now displayed.
(3) From this point, operate by the following regular procedure.
Note: Do not use the SP function when the patient’s eyes have been thoroughly dilated. The image will be over exposed.
Note: The image may contain flare around the edges of the images outside the photography range.
- Display the retina observation screen. Press the ALIGNMENT switch. The internal eye fixation lamp flashes for 3 seconds.
Note: When the stage unit is slid toward the other eye on the retina observation screen, the anterior eye observation screen is displayed.
- Adjust the brightness – turning the brightness adjuster clockwise increases the brightness; conversely, turning it counterclockwise reduces the brightness.
Note: Concerning the brightness for observation – there are four observation brightness positions on the scale. Considering the strain on the patient’s eye, select the lowest possible brightness level.
- Have the patient place their face securely against the face rest and chin rest.
- Decide on the are to be photographed – have the patient stare at the green internal eye fixation lamp. If necessary, while viewing the monitor, press the FIX TARGET switch to move the internal eye fixation lamp, and guide the patient’s eye. The internal eye fixation lamp moves up and down and toward the left and right.
Note: Resetting the internal eye fixation lamp position – when the SET switch is held down for about 2 or more seconds, the internal eye fixation lamp flashes for 2 seconds and can be returned to its reference position.
- Select the photography range – each time the x2 switch is pressed, the x2 photography function is set from the ON to OFF (or vice versa) and when the function is set to ON, “x2” is displayed on the monitor screen. When images are taken in this status, a range equivalent to one-fourth of the observation screen at the center (x2 photography range) is stored. The stored image will be enlarged and displayed on the monitor by the control software. Field angle is equivalent to 43°.
- Bring the eye into focus – turn the focus knob and align the split lines into a single straight line.
Note: When the split lines are not aligned into a single straight line:
If the split lines are not aligned:
Use the diopter compensation lever to insert the diopter compensation lens, and take the photographs. Given below is the diopter range in which images can be photographed.
0 position: –10 to +15 D
– position: –31 to –7 (D)
+ position: +11 to +33 (D)
However, when the diopter compensation lever is aligned with “-” or “+” position, the split lines will vanish from the screen so turn the focus knob and bring the examinee’s eye into focus so that the retinal image is clearly visible.
Note: When operating the diopter compensation lever, set it precisely to the 0, “-” or “+” position. If the lever is set to a position midway between two settings, fundus images will not be taken properly.
- Adjust the position of the retinal image – Tilt operation lever forward or backward so that the left and right working distance dots are made as small as possible. Also, use the operation lever to make fine adjustment so that positions of these dots are symmetrical between the top and bottom and symmetrical between the left and right.
Note: Flare will be visible around the edges of the retinal photographs unless these fine adjustments are undertaken properly.
- Take a photograph – check that the photography status display is green. In a flare-free status, check the focus again, and press the shutter release button. A retinal image is now taken, and the anterior eye observation screen is displayed. However, the retina observation screen will remain on the monitor if the stereo mode is established.
Note: Concerning the photography status display – the photography preparation statues of the retinal camera are indicated on the LCD monitor by the colors of the photography status displays.
Note: Concerning the adjustment of the flash intensity – the flash intensity is already set to the standard level for each photography mode (standard/low flash intensity). To adjust the intensity, press the flash intensity switches. Each time one of these switches is pressed, the intensity is increased or reduced by steps of 0.3. The flash intensity selected is shown by the lighted area of the flash intensity indicator.
- Review the image – the fundus images and study information are displayed in the control software. Check the images.
- Now take a photograph of the other eye – Taking photographs of one eye will cause the pupils of both eyes to contract excessively. Wait at least 5 minus, and check that the pupils have dilated. Then align the position of the other eye and bring it into focus by following the steps in the Adjusting the Position and Focusing section and take the photographs.
- End the study – end the study with the control software.
- Lock the stage unit – press the stage unit lock button to lock the stage unit.
- Turn OFF the power of the main unit – press the power switch to the O side.
The various settings can be established on the set up screen.
- Display the setup menu screen – press the SET switch on the anterior eye observation screen.
- The setup menu screen is now displayed.
- Change the settings.
- Exit the setup menu screen – when all the settings have been performed, press the SET switch. The settings are saved, and the display returns to the anterior eye observation screen.
Note: If the main unit enters the sleep move when the monitor displays the setup menu – if the main unit enters the sleep more when the monitor displays the setup meant, it saves the last displayed settings immediately before entering the sleep mode.