Table of Contents
Advertisement
Normal Values for Asian ONH Measurements
CIRRUS HD-OCT User Manual
Table A-5 CIRRUS Ganglion Cell Analysis Summary Parameters for Normal Asian Study
Eyes (μm)
Parameters
Average Thickness
Minimum Thickness
Temporal–Superior Thickness
Superior Thickness
Nasal–Superior Thickness
Nasal–Inferior Thickness
Inferior Thickness
Temporal–Inferior Thickness
CIRRUS ONH parameters are described in
Diversified" on page
A-9. They include:
2
• Rim Area (in units of mm
• Average cup to disc ratio (ratio of cup area to disc area)
• Vertical cup to disc ratio (ratio of cup height to disc height at the cup center)
• Cup Volume (in units of mm
Note that disc area is calculated and presented, but not compared to normal limits.
In addition, the plot of neuroretinal rim (NR) thickness around the disc is compared to
normative limits.
The descriptive statistics for each optic nerve head parameter are reported in
below.
Table A-6 CIRRUS ONH Summary Parameters for Normal Asian Study Eyes
Rim Area
(mm
Minimum
0.75
Maximum
2.27
Average
1.29
Standard Deviation
0.21
The disc area is of particular interest. Only thirteen subjects (less than 5%) had discs larger
2
than 2.5 mm
in the study eye. Ten subjects (less than 5%) had discs smaller than 1.3
2
mm
. Disc area showed no dependence on subject age. Classifying disc size as small,
medium or large has been previously done (see example, Spaeth), but typically the sizing
was based on a vertical diameter measured from the slit–lamp. By measuring the disc area
we consider all meridians.
Table A-7
based on dividing the normative data into thirds. One third of the database had discs of 1.7
2
mm
or smaller, one third had discs between 1.7 and 2.0 mm
2
discs larger than 2.0 mm
.
Mean
SD
83.2
5.3
80.9
5.4
82.2
5.6
84.6
5.9
85.8
5.9
83.0
5.9
80.7
6.0
82.8
5.5
"Optic Nerve Head Normative Database:
)
3
)
Disc Area
Average CD
2
2
)
(mm
)
Ratio
1.15
0.06
3.14
0.78
1.87
0.51
0.36
0.15
serves as a very general size classification guide
2660021169012 Rev. A 2017-12
A-31
Appendix
Minimum Maximum
67.8
99.5
63.8
95.2
65.0
99.0
62.0
102.0
70.0
103.0
66.0
105.0
65.0
98.0
70.0
102.0
Table
A-6,
Vertical CD
Cup Volume
3
Ratio
(mm
)
0.05
0.00
0.77
0.73
0.48
0.16
0.15
0.14
2
, and the remainder had
Advertisement
Table of Contents
Troubleshooting
