Analysis Protocols
Stratus OCT User Manual PN 2660021134133 A
6-26
• You can click and drag the Zoom In and Zoom Out sliders, click on and Clear Points on
the composite image.
• Composite Image Measurements:
• Disc Area: The area bounded by the red outline of the disc in the composite
image.
• Rim Area: Disc area minus cup area.
• Rim Cross Sectional Area: This is an estimate of the total rim area calculated
by multiplying the average of the individual scan widths across the nerve head
times the circumference of the disc.
• Rim Volume: This is an estimate of the total volume of RNFL tissue in the rim
calculated by multiplying the average of the individual rim areas times the
circumference of the disc.
• Cup Area: The area bounded by the green outline of the cup in the composite
image.
• Cup Volume: This is an estimate of the total volume, represented by the blue
shading of the cup as if it were filled with water to its surface.
• Cup/Disc Horizontal Ratio: Ratio of the longest horizontal line across the cup
to the longest horizontal line across the disc.
• Cup/Disc Vertical Ratio: Ratio of the longest vertical line across the cup to the
longest vertical line across the disc.
• Cup/Disc Area Ratio: Ratio of cup area to disc area.
• Save Current Result/Select a Saved Result: Click the Save Current Result button on the
lower right to save the current Optic Nerve Head analysis results. This is useful if you
adjust the placement of the disc reference points for one or more scan lines, and wish
to be able to recall the resulting measurements and images. This feature enables you
to save and recall several variations of the ONH analysis, depending on the
combination of adjustments you make to disc reference points of the individual scan
lines. By default, the ONH analysis reanalyzes the scan data and displays the original
result each time you run it. Use the Select a saved Result drop-down list to select a
result you have saved previously.
GPA Advanced Serial Analysis
Note: GPA Advanced Serial Analysis is an optional feature that may not be activated
on all instruments. If you do not have this feature and want to purchase it, contact
Carl Zeiss Meditec. In the U.S., call 1-877-486-7473; outside the U.S., contact your
local Carl Zeiss affiliate or distributor.
The GPA Advanced Serial Analysis protocol is an advanced version of RNFL Thickness Serial
Analysis designed to assist you in managing glaucoma by helping you determine whether
the rate of RNFL loss is statistically significant. When the analysis includes compatible
exam data from four or more visits (per eye), the analysis output includes a linear
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