113
5
SPECIFICATIONS AND TECHNICAL
INFORMATION
5.1
Specifications
Main body
•
Objective refractive
error measurement
Sphere
-20.00 to +20.00 D (VD = 12 mm) (0.12 / 0.25 D increments)
Cylinder
0 to ±12.00 D (0.12 / 0.25 D increments)
Axis
0 to 180° (1°/ 5° increments)
Minimum measur-
able pupil diameter
2 mm in diameter
Accuracy: The accuracy specifications are based on the results of eye model testing
performed in accordance with ISO 10342, Ophthalmic Instruments- Eye Refractometers.
•
Corneal curvature
radius measurement
Corneal curvature
radius
5.00 to 13.00 mm (0.01 mm increments)
Corneal refractive
power
25.96 to 67.50 D (0.12 / 0.25 D increments)
Corneal cylindrical
power
0 to ±12.00 D (0.12 / 0.25 D increments)
Corneal cylinder
axis
0 to 180° (1°/ 5° increments)
The measuring accuracy is in accordance with Type B, ISO 10343.
•
Pupil size measure-
ment
1.0 to 10.0 mm (0.1 mm increments)
•
Chart
Scenery chart or children’s chart
•
Observation/Display
3.5-inch color LCD
•
Interface
USB: One port
Wireless LAN (WLAN): 1ch
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 ISO 8429.
