• When measuring the CYL power using cross cylinder, if
CYL=0 and the dial is turned to+ direction, the AXIS is
shifted 90° to be the same power as when +CYL is added
and CYL and SPH are changed. In this case, “Axis has
been changed by 90° ” is displayed. (when in - CYL mode)
• The SPH changed value is changed according to the “XC
mode S.E fix” parameter setting.
• When AXIS 90° automatic change is not desired to be
performed, set the “XC mode AXIS 90° auto change”
parameter to “No”.
• When the cylindrical power is 0, it can be reconfirmed using the following procedure.
When the cylindrical power is 0, proceeding the program displays the message “No Cylinder
power. Skip the Cylinder test? Press [YES] or [NO].” (Note 1). Select “NO”.
1) After performing the red-green test, measure the cylindrical power.
2) Set a cylindrical power of 0.25 D.
3) Check the cylindrical power in the order of axis 180°, 45°, 90°, and 135°. If the patient indicates
that chart 1 looks clearer for all axes, set the cylindrical power as 0. This is the end of the
astigmatism test. If the patient indicates that chart 2 looks clearer for any axis, proceed to the
cylinder axis measurement for the axis in which the patient indicated that chart 2 was clearer.
Note 1: When the “Intelligent XC” parameter is set to “Yes” (factory setting), the message is dis-
played.
158
TEST METHOD
Astigmatism test
4.2.3
Astigmatism power test with cross cylinder lens (hold and
remove cross cylinder testing method)
Use: Cylindrical power refinement with the cross cylinder lens
Chart: Dots
Auxiliary lens: Cross cylinder lens
Ideal appearance: The dots chart when the cross cylinder lens is not set is
seen sharper.
[Procedure example]
1
Detect the cylindrical axis in the same manner of procedures 1 to 4 of "4.2.2 Astigmatism
test with cross cylinder lens" (page 157). See "2.5.1 Program A" (page 43).
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