129
17.2 Holladay EKR65 Detail Report
The
upper box
in
Figure 158
, shows the demographic information regarding the patient is in the box
at the top of the Page 2.
The
upper left box
(Figure 158)
shows the table for the EKR65 (D) for various parameters from 1.0
to 7.0 mm
[35,36,37]
. All values are calculated from the pupil center, so that only rays actually
contributing to the retinal image are used.
The
upper right graph
(Figure 158)
shows the mean zonal EKR (D) versus zone diameter (blue), the
mean zonal axial radius of curvature (mm) versus zone diameter (red) and the mean ring axial radius
of curvature (mm) versus zone diameter (green). The blue values represent refractive power (D) of a
zone as one moves from the center of the pupil. The increase in power reflects the normal presence
of positive SA in the human cornea (approximately 2 D from center to periphery).
The
lower left graph
in
Figure 158
, is a histogram showing the relative frequency of EKR power over
the selected zone (default is 4.5 mm zone). The graph is rarely symmetrical and often has multiple
peaks with a nominal 2 to 3 D range.
Figure 158: Holladay EKR65 Detail Report of a normal exam
17 Holladay Report & Holladay EKR65 Detail Report
