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DISPLAYING TOMOGRAMS
[Grid]
The Grid function displays the thickness between selected layers in each grid as the average value.(See
"A-2: Image Processing Controls area"on P. 83.) The result of the comparison with normal data can also
be displayed as a colormap.
Grid is defined as follows.
"ETDRS" is valid for "Radial" and "3D: Macula, 6.0×6.0mm".
"RNFL4", "RNFL6" and "RNFL12" are valid for "3D: Disc, 6.0×6.0mm".
Grid type Grid definition
Rectangular • 10×10 grid where the length of one side is equal to 1/10 of 6mm (in "3D Vertical"
scan)
• 24×24 grid where the length of one side is equal to 1/24 of one side length of 3D
scan area (in "3D Disc 512×128 6×6mm" scan)
• 6×6 grid where the length of one side is equal to 1/6 of one side length of 3D
scan area (in 3D scan except the above-mentioned scans)
ETDRS The nine fields separated from the three concentric circles (diameter: 1, 3 and
6mm) by the ±45-degree line.
RNFL4 The area divided into four sections equally on the circumference. The circle radius
can be changed by selecting "On" of [On/Off] in the [Circle] menu.
RNFL6 The area divided into six sections equally on the circumference by 45 degrees in
vertical direction and by 90 degrees in horizontal direction. The circle radius can
be changed by selecting "On" of [On/Off] in the [Circle] menu.
RNFL12 The area divided into twelve sections equally on the circumference. The circle
radius can be changed by selecting "On" of [On/Off] in the [Circle] menu.
CAUTION
The Measure Image function is based on the theoretical Gullstrand eye
model. If the parameters of the actual patient's eye, such as the diopter
or axial length, are different from the Gullstrand eye model, the mea-
surement results may be different from the length and size in reality. The
clinician will be solely responsible for the diagnoses and treatments
based on the measurement results.
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