162
TEST METHOD
Spherical Refinement
4.3.2
Cross grid test for far vision
Use: Spherical refinement
Chart: Cross-grid
Applicable model: CP series T, P, F, SC series T and P
Auxiliary lens: ±0.50 D cross cylinder lens (Fixed with the axis set at 90º.)
Ideal appearance: The sharpness of the horizontal and vertical lines appears equal.
[Procedure example]
1
Press
.
2
Press
or
to occlude either measuring window.
3
Present the cross-grid chart.
Press
.
The cross cylinder lens of ±0.50 D is placed in the specified measuring window.
4
Ask a patient, “Which are sharper, the horizontal or vertical line?”
The horizontal and vertical lines appear equal.
The spherical power is properly refined.
The horizontal lines are sharper.
In the case of myopia, the spherical power is overmin-
used. In the case of hyperopia, the spherical power is undercorrected.
The vertical lines are sharper.
In the case of myopia, the spherical power is undermi-
nused. In the case of hyperopia, the spherical power is overcorrected.
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Содержание RT-5100
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Страница 46: ...28 BEFORE USE Getting Started and Exiting 161221687130 承認済 Uncontrolled copy when printed ...
Страница 226: ...208 TEST METHOD Visual Acuity Test by ETDRS chart 161221687130 承認済 Uncontrolled copy when printed ...
Страница 274: ...256 MAINTENANCE List of Replacement Parts 161221687130 承認済 Uncontrolled copy when printed ...
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