Paragon CRT Dual Axis User Manual

manifest more than 50 microns of meridional dierence in elevation at the 8 mm
chord diameter. In such cases, a three-step, 75-micron or four-step, 100-micron
meridional dierence in the RZD may be indicated.
When tting Paragon CRT Dual Axis®, use this chart to determine the variation of
RZD or LZA in conjunction with the average elevation dierences.
When to Change the LZA?
One may observe a cornea that does not manifest a meridional elevation dierence
at the 8mm chord diameter but does manifest signicant dierences in the edge
clearance circumferentially. In such cases, the Landing Zone Angle should be varied
in a second axis to provide a more uniform circumferential edge clearance. e
recommended method of tting is to continue to use the LZA that appears to be
correct in the meridian having proper edge clearance and increase the LZA for
the alternate meridian where there is excessive edge clearance. A dierence of one
degree in the second meridian will be clinically signicant and a dierence of two
degrees may be needed when there is a marked dierence in the edge clearance
observed in the uorescein pattern.
If the Average
Meridional
Elevation
difference is
Use This RZD in
the Elevated/Red
Meridian
RZD suggested by
CRT Lens Selector
(550)
Increased the RZD
used in Flat
Meridian by 50
Microns (550 & 600)
LZA suggested by
CRT Lens Selector
(-33)
Add one degree if
cdgc lift is exessive
(-33 & -34)
Add one degree if
cdgc lift is exessive
(-33 & -34)
Add one degree if
cdgc lift is exessive
(-33 & -34)
LZA suggested by
CRT Lens Selector
(-33)
LZA suggested by
CRT Lens Selector
(-33)
Increased the RZD
used in Flat
Meridian by 50
Microns (550 & 625)
Increased the RZD
used in Flat
Meridian by 50
Microns (550 & 650)
RZD suggested by
CRT Lens Selector
(550)
RZD suggested by
CRT Lens Selector
(550)
30 - 60 Microns
60 - 90 Microns
> 90 Microns
Use This RZD in
the Shallow/BLUE
Meridian
Use This LZD in
the Elevated/Red
Meridian
Use This LZD in
the Shallow/BLUE
Meridian
Image D

Paragon CRT Dual Axis Specifications

General

Brand	Paragon
Model	CRT Dual Axis
Category	Medical Equipment
Language	English