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Image capturing is performed after selecting the subject and click the Capture button on the PC screen,
When using a non-mydriatic camera, the subject’s pupil needs to be dilated in a darken place (a light level at which a newspaper can barely be read).
The operating procedure for the Normal Photography mode is explained below:
  • Select the subject from the patient list and click the Capture button on the PC screen
  • Prepare the subject for image capturing.

(1) If the subject is wearing contact lenses, instruct them to remove them.

(2) Have subject seat themselves in the chair in front of the instrument.

(3) Clean the chinrest and forehead rest with a clean cloth or the equivalent. As necessary, use a gauze or absorbent cotton swab dampened with disinfection alcohol.  If chinrest papers are used, remove a sheet after each patient.

(4)Have the subject rest their chin on the chinrest and their forehead on the forehead rest securely. If the subject is not in a comfortable posture, adjust the height of the table and chair.

(5) Adjust the chinrest height by the Chinrest Up/Down buttons so that the subjects eyes are roughly level with the eye level marker.

  • Perform alignment using the Joystick so that the subject’s eye is displayed on the LCD monitor. Start NAVIS-Lite on the PC.

When the alignment is completed, eight illumination spots arranged in a circle reflected from the cornea appear. When they are detected, the Auto Tracking function is activated to adjust the center of the screen to the height of the anterior eye of the subject.

* The Auto Tracking function adjust only the vertical position of the screen.

* If the Auto Tracking switch is OFF adjust the screen height using the Joystick.

<If the Auto Tracking function stops before the anterior eye comes to the center of the screen>

The Vertical Movement Limit indicator appears. Adjust the chinrest height by the Chinrest UP/Down buttons.

  • Perform alignment in the horizontal direction using the Joystick so that the circle formed by the illumination spots and the Required Pupil Diameter mark become concentric.
  • Perform alignment in the forward and backward directions using the Joystick so that only a single line of the Movement Distance indicator is displayed.

Perform the alignment while looking at the Movement Distance indicator and the Target mark.

*Depending on the condition of the subject’s eye, the indicator may not be displayed even though the alignment is performed properly. In this case, perform the alignment while looking at the Anterior Eye Observation screen so that the subject’s eye is focused properly.

When the alignment tot he subject’s eye is completed, an icon that indicates activation of the Auto Focus function appears, and the Anterior Eye Observation screen changes to the Fundus Observation screen automatically. The focus is roughly adjusted to the funds by the Auto Focus function.

* The Auto Focus function is not activated when it is set to OFF. In this case, adjust the focus using the Focusing Knob,

*The Auto Focus function may not be activated for certain eyes, such as those with cataract, or severe myopia or hyperopia that exceeds ± 20D.

*If the Fundus Focus Undetection Mark is displayed, the focus may not be adjusted to the fundus properly. Adjust the focus using the Focusing knob.

  • If the Fundus Observation screen is too dark or too bright, adjust the Observation Illumination Intensity Knob.
  • Change the Internal Fixation target position but the Internal Fixation Target button so that the desired part of the eye is displayed.

* To confirm alignment on the Anterior Eye Observation screen, perform one of the procedures below:

Press and hold the Anterior Eye/Fundus Auto Change switch. The Anterior Eye Observation screen is displayed while the switch is pressed. At this time, the Operation Distance indicator is not displayed. If alignment is retained while the switch is pressed, releasing the switch displays the Anterior Eye Observation screen.

  • Confirm the detection of the eyelid and required pupil diameter.

The results of the eyelid and required pupil diameter detection are displayed by on icons on the right side of the screen.

*When the Eyelid/Required Pupil Diameter Detection switch is turned OFF, image capturing can be performed regardless of the results of the eyelid and required pupil diameter detection.

  • Execute image capturing by pressing the Release button

When image capturing is finished, the captured image is automatically transferred to the PC. The Transfer animation is displayed during the transfer.

When the transfer is completed, the Transfer animation disappears and the Fundus Observation screen appears.

On the PC screen, the captured image is displayed in the Image Capture window of NAVIS-Lite. A tab attached at the top right of the image so that the orientation can be confirmed.

  • Perform image capturing of the other eye starting from Step 2
  • Click the Save All button on the toolbar in the Image Capture window of NAVIS-Lite. 

The captured images are saved.

  • Click the Return button on the toolbar in the Image Capture widow of NAVIS-Lite.

The patient list window appears

  • To perform image capturing for the next subject, select the desired subject from the patient list on the PC and click the Capture button.
  • Perform the image capturing procedure for the next subject starting from Step 1.

If the subject’s pupil is smaller than the required size (Φ4.0mm), perform image capturing in this mode. In this mode, the Small Pupil Photography Mode mark “SP” is displayed blinking on the left of the screen of the instrument.

  • Press the Small Pupil Photography Mode switch “SP” on the LCD Monitor.
  • Set parameter “01. AUTO SP FUNC.”  to “ON” (The factory setting is “OFF”). If the subject’s pupil is smaller than the required size (Φ4.0mm) in the Fundus Observation screen, this mode is selected automatically.

The Small Pupil Photography mode procedure is explained below with parameter “01. AUTO SP FUNC.” set to “OFF”.

  • Prepare the subject for image capturing.
  • Perform alignment using the Joystick so that the anterior eye is displayed on the LCD monitor screen.
  • Perform alignment in the horizontal direction so that the circle formed by the illumination spots and the Required Pupil Diameter mark become concentric. If the pupil is smaller than the Required Pupil Diameter mark, press the Small Pupil Photography Mode switch SP to enter the Small Pupil Photography mode.

The Small Photography Mode mark SP is displayed blinking on the left of the screen. The Required Pupil Diameter mark disappears and the Small Pupil Diuameter mark appears.

*If the subject’s pupil is smaller than the minimum pupil diameter (Φ3.7mm), proper images cannot be captured.

  • Perform alignment in the forward and backward directions using the Joystick so that only a single line of the Movement Distance indicator is displayed.

The Anterior Eye Observation screen changes to the Fundus Observation screen. At the same time, the Auto Focus function is activated and the focus is adjusted to the fundus.

  • If the Fundus Observation screen is too dark or too bright, adjust the Observation Illumination Intensity knob.
  • Change the Internal Fixation target position with the Internal Fixation Target button so that the desired part of the eye is displayed.
  • Observe the screen. If necessary, perform fine adjustment of the alignment with the Joystick and the focus with the Focusing knob.

Alignment

Left, right, up, and down directions: Adjust the Optical Working Dots symmetrically to the Optical Working Dot Charts.

Forward and backward directions: Adjust the size of the Optical Working Dots so that they can be seen most clearly.

Focus 

Adjust the focus so that the left and right focus bars form a single line.

*Flare may be captured outside the Capture Range mark displayed on the Fundus Observation screen,

  • Execute image capturing by pressing the Release button.
  • Perform image capturing of the other eye starting from Step 2.
  • Click the Return button on the toolbar in the Image Capture window of NAVIS-Lite. 

Transferred captured images are saved on the PC, and the patient list window appears

  • Prepare the subject for image capturing.
  • Select the Anterior Eye Photography mode by pressing the Anterior Eye Photography switch.

The auxiliary lens is inserted, and the image capturing mode indicate at the bottom left of the screen changes from to A. The Auto Tracking function, Anterior Eye/Fundus Auto Change function, and Auto Focus functions are disabled. IF the Eyelid/Required Pupil Diameter function is also disabled.

  • Perform alignment using the Joystick so that the anterior eye is displayed on the LCD monitor screen after moving the Image Capturing unit toward you.
  • After adjusting the anterior eye to the center of the screen, adjust the focus visually using the Focus knob while observing the screen.
  • Execute image capturing by pressing the Release button.

When the image c capturing is finished, the captured image is automatically transferred to the PC. The Transfer animation is displayed during the transfer. When the transfer is completed, the Transfer animation disappears and the Fundus Observation screen appears. In the OC screen, the captured image is displayed in the Image Capture window of NAVIS-Lite.

  • If necessary, perform image capturing of the other eye starting from Step 3.
  • Click the Return button on the toolbar in the Image Capture window of NAVIS-Lite.

Transferred captured images are saved on the PC, and the patient list window appears.

This mode is used to capture two fundus images: one at about 1mm away to the Temporal side from the fundus center, and the other at about 1mm away to the Nasal side from the fundus center. The two captured images are saved as a set and can be viewed stereoscopically using the special Stereo Viewer (optional).

See the NAVIS-Lite operator’s manual for details of the stereoscopically viewing.

The procedure for stereo image capturing is described below. Although two images are captured with the focus offset about 1mm from the fundus center, the procedure is basically the same as Image Capturing (Normal Photo Mode).

  • Prepare the subject for image capturing.
  • Change the image capturing mode to 1 by the Stereo Photography Mode switch.

The image capturing mode indication at the bottom left of the screen changes from N to (Temporal side).

  • Perform alignment using the Joystick so that the anterior eye is displayed on the LCD monitor screen. (This is an explanation of for the left eye).
  • Perform alignment in the horizontal direction using the Joystick so that the circle formed by the illumination spots and the Required Pupil Diameter mark become concentric.
  • Perform alignment in the forward and backward directions using the Joystick so that only a single line of the Movement Distance indicator is displayed.

The Anterior Eye Observation screen changes to the Fundus Observation screen. At the same time, the Auto Focus function is activated and the focus is adjusted to the fundus.

In the Fundus Observation screen, the Stereo gauge (blue) with scales is displayed.

  • If the Fundus Observation screen is too dark or too bright, adjust the Observation Illumination Intensity knob.
  • Change the Internal Fixation target position by the Internal Fixation Target button so that the desired part of the eye is displayed.
  • Observe the screen. If necessary, perform fine adjustment of the alignment with the Joystick and the focus with the Focusing knob.

Alignment

Up and down directions: Adjust the two Optical Working Dots on the Stereo gauge.

Left and right directions: Adjust the positions of the left and right Optical Working Dots so that they are at about the same distance from the center of the screen. Move the Image Capturing unit of the instrument of the Temporal side of left eye to shift the Optical Working Dot on the right side of the screen about three scales of the Stereo gauge to the left.

Forward and backward directions: Adjust the size of the Optical Working Dots so that they can be seen  most clearly.

Focus

Adjust the focus so that the right and left Focus bars for a single line.

  • Execute image capturing by pressing the Release button.

When image capturing is finished, the captured image is automatically transferred to the PC. The transfer animation is displayed during the transfer. When the transfer is completed, the Transfer animation disappears and the Fundus Observation screen appears. On the PC screen, the captured image is displayed in the Image Capture window of NAVIS-Lite.

  • Press the Stereo Photography Mode switch

The image capturing mode indication at the bottom left of the screen changes from to (Nasal side).

  • Perform Steps 3 to 7.
  • As in Step 8, observe the screen. If necessary, perform fine adjustment of the alignment with the Joystick and the focus with the Focusing knob.

For the alignment in left and right directions, the Optical Working Dot is shifted to the opposite direct as Step 8.

Alignment

Up and down directions: Adjust the two Optical Working. Dots on the Stereo gauge (green).

Left and right directions: Adjust the positions of the left and right Optical Working Dots so that they are at about the same distance from the center of the screen. Move the Image Capturing unit of the instrument to the Temporal side of left eye to shift the Optical Working Dot on the right side of the screen about three scales of the Stereo gauge to the left.

Forward and backward directions: Adjust the size of the Optical Working Dots so that they can be seen most clearly.

Focus

Adjust the focus so that the left and right focus bars from a single line.

  • Execute image capturing by pressing the Release button

When image capturing is finished, the captured image is automatically transferred to the PC. The Transfer animation is displayed during the transfer. When the transfer is completed, the Transfer animation disappears and the Fundus Observation screen appears. On the PC screen, the captured image is displayed in the Image Capture window of NAVIS-Lite.

  • If necessary, perform image capturing of the other eye starting from Step 2.

For the right eye, the Stereo gauge is displayed in Reverse to that for the left eye. The optical Working Dot is shifted to the opposite direction as in the case for the left eye.

  • Click the Return button on the toolbar in the Capture window of NAVIS-Lite. 

Transferred captured images are saved on the PC, and the patient list window appears.