45
OPERATING PROCEDURE: Corrected Visual Acuity Measurement (Subjective Refractive Error Measure-
3.5.3
Contrast visual acuity / glare visual acuity measurement
Reduced visual performance when a low contrast VA chart is viewed or dazzling light is shone to the
eye can be checked.
1
Perform distance visual acuity measurement.
2
Press the contrast/glare
button to display the contrast visual acuity measure-
ment screen.
“CHART:LOW” is displayed on the screen and a chart
*1
is presented to the patient at a low contrast
level.
3
In the same manner as distance visual acuity measurement, press the chart up
button or chart down
button to determine the limit of the VA value (LOW C) that
the patient can read.
Other button operations
*1. A chart to be initially displayed can be selected by the “100. GLARE CHART” parameter.
Contrast/glare
Confirms the contrast VA value (LOW C) and switches to the glare visual acuity
measurement.
Return
Exits from corrected visual acuity measurement mode and returns to the AR
(AR/KM) measurement screen.
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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 ...