42
OPERATING PROCEDURE: Corrected Visual Acuity Measurement (Subjective Refractive Error Measurement)
3.5.2
Near visual acuity measurement
Near visual acuity measurement with vision corrected for distance vision, addition power measure-
ment required for prescription of glasses for near vision, and visual acuity measurement with addition
power can be performed.
1
Perform distance visual acuity measurement in the corrected visual acuity measure-
ment screen.
2
Press the near
button to enter near visual acu-
ity measurement mode.
The working distance to the chart changes from the one for
distance vision to 40 cm-equivalent. “<40cm>” is displayed in
the upper middle of the screen.
*1
The near VA chart is viewed with the corrective lens
(ADD 0.00 D) used in distance visual acuity measure-
ment.
To change the working distance
3
Switch charts in the same manner as distance
visual acuity measurement to determine the limit of
the VA value (NEAR) that the patient can read.
4
To finish near visual acuity measurement without any addition power (ADD), switch
the eye to be measured and measure the other eye in the same manner.
5
Press the return
button to exit from corrected visual acuity measurement mode
and return to the AR (AR/KM) measurement screen.
The VA value without any addition power (ADD +0.00) is saved.
*1. The near working distance can be set between 35 and 70 cm (5 cm increments) or 14 and 28 inches (2-inch increments) by the
“56. WORKING D.” parameter.
• A chart to be initially displayed when the screen is switched to near visual acuity measurement mode
can be selected by the “93. NEAR CHART” parameter. (The default setting is the 0.63 VA chart.)
• When addition power is contained in LM data, pressing the near
button adds the addition
power automatically.
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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 ...