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99
5
SPECIFICATIONS AND TECHNICAL
INFORMATION
5.1
Specifications
•
Objective refractive error
measurement
Sphere
-30.00 to +25.00 D (VD = 12 mm) (0.01/0.12/0.25 D incre-
ments)
Cylinder
0 to ±12.00 D (0.01/0.12/0.25 D increments)
Axis
0 to 180° (1°/5° increments)
Minimum measurable pupil
diameter
2 mm in diameter
Accuracy: The accuracy specifications are based on the results of eye model testing
performed in accordance with ISO10342, Ophthalmic Instruments- Eye Refractometers.
•
Subjective refractive
error measurement
Visual acuity measurement
<0.1 / 0.1 / 0.25 / 0.32 / 0.4 / 0.5 / 0.63 / 0.8 / 1.0 / 1.25
<20/200 / 20/200 / 20/80 / 20/60 / 20/50 / 20/40 / 20/30 /
20/25 / 20/20 / 20/16
Sphere
-20.00 to +20.00 D (VD = 12 mm) (0.25 D increments)
Cylinder
0 to ±8.00 D (Max.) (0.25 D increments)
Axis
0 to 180° (1°/5° increments)
Near addition power
0 to +9.75 D (0.25 D increments)
•
Keratometry measure-
ment
Corneal curvature radius
5.00 to 13.00 mm (0.01 mm increments)
Corneal refractive power
25.96 to 67.50 D (n = 1.3375) (0.01/0.12/0.25 D incre-
ments)
Corneal cylindrical power
0 to ±12.00 D (0.01/0.12/0.25 D increments)
Corneal cylinder axis
0 to 180° (1°/5° increments)
The measuring range is in accordance with Code A, ISO 10343 and the measuring accu-
racy in accordance with Code 2, ISO 10343.
•
Pupillary distance mea-
surement
30 to 85 mm (1 mm increments)
(For near vision: 28 mm to 80 mm when the near working distance is 40 cm)
•
Corneal size measure-
ment
10.0 to 14.0 mm (0.1 mm increments)
•
Pupil size measurement
1.0 to 10.0 mm (0.1 mm increments)
Criterion
Measurement range
Maximum scale
interval
Test device
a
Tolerance
Spherical vertex
power
–15 D to +15 D
(Maximum meridional
vertex power)
0.25 D
0 D, ±5 D, ±10 D
±0.25 D
±15 D
±0.50 D
Cylindrical vertex
power
0 D to 6 D
0.25 D
Sph: approx. 0 D
Cyl: –3 D
Axis: 0° 90°
±0.25 D
Cylinder axis
b
for
cylinder power
0° to 180°
1°
±5°
a The refractive error of the test device shall not differ by more than 1.0 from the nominal value
above.
b Cylinder axis shall be indicated as specified in ISO8429.
Содержание ARK-1S
Страница 1: ...AUTO REF KERATOMETER AUTO REF KERATOMETER ARK 1s ARK 1s OPERATOR S MANUAL OPERATOR S MANUAL ...
Страница 6: ...IV ...
Страница 76: ...70 OPERATING PROCEDURE Operation when Peripheral Devices are Connected ...
Страница 112: ...106 SPECIFICATIONS AND TECHNICAL INFORMATION EMC Electromagnetic Compatibility ...