Optos 200tx - How to measure distance; How to measure the Cup to Disk Ratio; How to measure the ISNT Rule; About review notes, diagnostic (pathology) codes and procedure codes

Chapter 8 - Documenting your review
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Polygon – click each point around the area to be measured. Lines will be drawn between the
points clicked. Double-click to complete the polygon.
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Ellipse – hold down the left mouse button and stretch the circle around the area to be
measured. Release the mouse button when you have finished drawing the area.
4. Enter the name of the annotation in the Annotation Label dialog box and click OK.
How to measure distance
1. Open the image you want to review.
2. Select Annotation menu > Measure > Measure Distance. Click the start and end points to draw a line between
the points that you want to measure.
3. Enter the name of the annotation in the Annotation Label dialog box and click OK.
How to measure the Cup to Disk Ratio
1. Open the image you want to review.
2. Zoom in to display a close up view of the optic disk.
3. Select Annotation menu > Measure > Cup To Disk Ratio and click at least five points on the border of the optic
cup. Double click to complete the outline.
4. Click at least five points on the border of the optic disk. Double click to complete the outline.
5. The software will draw an ellipse around each set of points.
6. If required, use the annotation edit feature to adjust the circles into the correct position, see How to
edit an annotation on page 52.
Note
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The status bar will indicate which area is to be identified.
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The points are initially shown as a polygon to indicate where the points have been selected on
the cup and disk.
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The ratio is calculated using the number of pixels in the area of each ellipse. This produces a
different ratio than that calculated using diameter distances of both ellipses.
How to measure the ISNT Rule
The ISNT (Inferior, Superior, Nasal and Temporal) Rule measurement is not available when reviewing
standard optomap® images.
1. Open the image you want to review, see Opening images on page 36.
2. Zoom in to display a close up view of the optic disk.
3. Select Annotation menu > Measure > Measure ISNT Rule.
4. Draw a line across the inferior neuro-retinal rim.
5. Repeat the previous step for superior, nasal and temporal neuro-retinal rims.
6. The ISNT Rule will be displayed when the four lines have been drawn. The annotation color will
indicate if the result is within expected parameters; pink when results should be queried and pale
green when results are within expected parameters.
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Cup to Disk Ratio details are also displayed.
About review notes, diagnostic (pathology) codes and procedure codes
Review notes store text information about the image. They also store diagnostic or procedure codes
assigned to the image. These notes and codes can be saved and sent to be reviewed by another person.
Several reviewers can add review notes to a single image.
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Review notes - record the text information for an image.
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