43
OPERATING PROCEDURE: Corrected Visual Acuity Measurement (Subjective Refractive Error Measure-
To return to the corrected visual acuity measurement screen, press the near
button.
6
Press the ADD
button to display the addition
power measurement screen.
The addition power of 1.75 D is added as the default setting.
*1
7
Change the addition power if necessary.
According to the patient’s age, starting from the addition power in the table below is recommended.
8
Determine the limit of the VA value in the same manner.
9
Switch the eye to be measured and measure the other eye in the same manner.
10
Press the return
button to exit from corrected visual acuity measurement mode
and return to the AR (AR/KM) measurement screen.
The VA value with addition power (ADD) is saved.
To return to the corrected visual acuity measurement screen, press the near
button.
*1. The addition power added as the default setting can be changed by the “99: ADD SELECT” parameter.
When addition power is contained in LM data, the addition power is added to the distance power of LM data.
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U
0.1
0.25
0.32
0.4
0.5
0.63
0.8
1.0
1.25
ADD up
Changes the addition power by +0.25.
ADD down
Changes the addition power by -0.25.
Predicted
addition power
Age
45
50
55
60
65
70
75
Addition power (D)
1.50
2.00
2.25
2.50
2.75
3.00
3.25
Recommended
starting
addition power
Age
to 45
to 50
to 55
to 60
to 65
to 70
71 to
Addition power (D)
0.75
1.25
1.50
1.75
2.00
2.25
2.50
• When R or L of the eye to be measured is switched, the addition power of LM data is initially dis-
played. If no addition power is contained in LM data, the addition power that was used before switch-
ing is displayed.
• Because of single eye measurement, measured values of addition power may be unstable for
patients under 50 years old.
Summary of Contents for ARK-1S
Page 1: ...AUTO REF KERATOMETER AUTO REF KERATOMETER ARK 1s ARK 1s OPERATOR S MANUAL OPERATOR S MANUAL ...
Page 6: ...IV ...
Page 76: ...70 OPERATING PROCEDURE Operation when Peripheral Devices are Connected ...
Page 112: ...106 SPECIFICATIONS AND TECHNICAL INFORMATION EMC Electromagnetic Compatibility ...