Case 1: Holladay Report & Holladay Ekr65 Detail Report Of A Normal Exam - OCULUS Pentacam Interpretation Manual

17 Holladay Report & Holladay EKR65 Detail Report
The lower central table in
Figure 158, shows the EKR65 mean, is the weighted mean where 65% of
the values are represented using the smallest range of points. In the above graph this value is 40.76
D (40.8 D) for the range indicated. Note that this value is less than the 40.93 D global mean of EKR
that results when all points are used. The highest peak is at 41.20 D. In a normal cornea these three
values will vary by less than 0.50 D. The actual size of the pupil during the exam is shown with
a dashed circle. The zone diameter may be changed by using the up or down arrow button or by
clicking the red graphic and dragging the red circle larger or smaller diameter. The new values are
calculated instantaneously.
The lower right map
(Figure 158) shows the EKR power map uses both front and back power,
"Snell's law, and represents the values that are appropriate for IOL power calculations. The EKR65
flat K1 (40.11 A 161) and EKR65 steep K2 values (41.42 A 71.4) are the appropriate values to enter
for K-readings. No additional adjustment needs to be made for back surface power or toricity. The
4.5 mm zone has been shown to be the best value for large data sets, but for a specific patient the
value may be customized to the individual patient (values from 3.0 to 4.5 mm zonal diameter may
be used). For example, if a patient has an unusually small pupil (3.0 mm) at mesopic light levels and
the EKR65.
17.3 Case 1: Holladay Report & Holladay EKR65 Detail Report
of a normal exam
Figure 159: Holladay Report of a normal exam
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