Chapter 5 - About capturing an image
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Ask the patient to open both eyes as wide as they can.
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Check the pupil and limbus positioning.
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Capture the image by pressing the capture button on the hand switch. Alternatively, you can
capture the image by pressing [F8] on the keyboard.
How the patient uses the self alignment option (not applicable when eye steering or capturing stereo
images)
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Ask the patient to keep looking at the green ball.
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As the patient moves in, two red lights will be displayed when the patient is at the correct
distance. One red light will appear above and the other below the green ball.
6. Select the optomap® af if you are capturing an optomap® af image.
7. If you are capturing eye steered images you will need to ask the patient to look in a particular
direction, How to do eye steering on page 29. You should always capture an on-axis image before
capturing eye steering images.
8. Check the quality of the image, see Checking the quality of captured images on page 30.
9. Capture more images or click End Procedure to complete the procedure.
Note:
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The Fixation Level controls the brightness of the green ball. Always use the dimmest Fixation Level
setting the patient can see.
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200Tx only - Click RESET POSITION to re-centre the green ball if required.
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If the alignment system does not turn green you should align the rings as accurately as you can.
Take an image when you think the alignment is correct.
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If the patient's lids and lashes are in the way follow your practice procedures to minimize this,
see Minimizing lids and lashes in images on page 33.
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Positional Reflex (bright spots) may occur when patient is too far in.
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If the patient is not in far enough, guide the patient a little closer until the rings turn red; at this
point the patient is too close. Gently move the patient away again until the rings have just turned
green.
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When imaging a patient with a large head, you can use the grooves behind the face pad to get
the patient closer.
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If the patient was too far in or too far out you can use the z-axis numbers to improve the patient
positioning in the next image. When External Eye Camera view appears, the previous z-axis capture
setting is briefly displayed. Remember this number, and increase the number in the next image
if the patient was too far in, and decrease the number if the patient was too far out.
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The Image Setting pane shows the External Eye Camera view when the image was captured. You can
use this to help determine the adjustments required for subsequent images. You can also adjust
the settings for the next image to be captured from this pane.
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You may need to adjust the positioning if the patient moves during the early-phase of an
optomap® fa procedure.
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When swapping between left and right eyes you should:
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Check the table and chin cup height and make any adjustments.
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Move the chin rest to the other side and adjust the chin rest angle for aligning the other eye.
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When imaging patients in wheelchairs:
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Where possible the patient should be aligned straight-on, facing the device.
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The patient should be as straight on as possible with accommodation made for the wheelchair or the
patient's physical limitation.
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When imaging children, depending on the height of the child, ask the child to stand straight in
front of the device.
Capture Single Eye Image
The single eye image capture procedure is followed for standard optomap® and optomap® plus
procedures. It is also used in the first part of the procedure for capturing optomap® fa images.
1. Complete the preliminary checks, see Single Image Preliminary checks on next page.
2. Tell the patient what will happen, see Patient instructions.
3. Align the patient, see Capturing images.
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