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APPENDIX: Descriptions of Power Adjustment
8
E. Myopia/Hyperopia and Astigmatism in Combination
The spherical and cylindrical powers are adjusted respectively as described in A. Myopia to D.
Oblique Astigmatism.
F. Anisometropia
Based on the concept that the difference between left and right powers is within 0.75 D, the patient
who has the difference of 1 D or more is regarded as anisometropia. The higher power is adjusted
close to the lower one as described in A. Myopia to D. Oblique Astigmatism.
When the LM data is entered in the refractor, the auto adjustment function adds 0.75 D to the higher
power side of the lensometry data.
G. One is Myopia and the Other is Hyperopia
The auto adjustment is not performed. The “Dominant far: + S
0 Dominant near: – S
0” message
appears.
When the right and left powers are low, correction may be not necessary. However, it is recommended
to adjust the powers depending on the patient’s purpose.
For the patient who uses glasses for distance (far) correction
Adjust the positive spherical power close to 0.
For the patient who uses glasses for near correction
Adjust the negative spherical power close to 0.
For example: SPH R +1.00 D, L –1.00 D, To correct the powers for distance:
Press
.
Press
.
Then turn the dial clockwise until the best VA is obtained.
This adjustment should be performed manually by the operator. Copy the full correction and compare
the viewability for easy adjustment.
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