Analysis Protocols
Stratus OCT User Manual PN 2660021134133 A
6-34
• Below the right map a pair of radio buttons appear, to adjust the diameter of the
maps displayed. The default map circle diameters are 1, 3 and 6 mm. Click the 3.45
mm radio button to change to circle diameters of 1, 2.22 and 3.45 mm.
• On the lower right, numeric information includes Center, which represents the
calculation of average thickness (in micrometers) +/- the standard deviation for the
center point, where all six scans intersect; and Total Volume of the retinal map area
in mm
3
.
When applied to a Fast Macular Thickness Map (Fast Mac) scan, the normative
data color code applies to the circular map on the right. The right map shows average
retinal thickness for each map sector, in micrometers, and applies the normal distribution
percentile colors to those sector averages. The normal distribution percentile legend
appears below the right map.
Among same-age individuals in the normal population, the percentiles apply to each
particular retinal thickness measurement as follows:
• The thickest 1% of measurements fall in the light red area. Measurements in light red
are considered outside normal limits. (light red
> 99%, above normal limits).
• The thickest 5% of measurements fall in the light yellow area or above (95% < light
yellow
99%, suspect above normal)
• 90% of measurements fall in the green area (5% green 95%).
• The thinnest 5% of measurements fall in the yellow area or below
(1%
yellow < 5%, suspect below normal).
• The thinnest 1% of measurements fall in the red area. Measurements in red are
considered below normal limits (red
< 1%, below normal limits).
Note: Clinicians must exercise judgment in the interpretation of the macula
normative data. For any particular measurement, note that 2 out of 20 normal eyes
(10%) will fall either above or below green.
Note: Subject ethnicity was self-reported by the patients in the population
comprising the normative database but was NOT used as a variable in constructing
the normative database for macular thickness. Normative data will not appear for
patients under 18 years of age. The macula normative data appears only when you
analyze a
Fast Macular Thickness Map (Fast Mac) scan.
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