© HAAG-STREIT AG, 3098 Koeniz, Switzerland – HS-Doc. no. 1500.7220055.04100 – 10. Edition / 2015 – 06
4.5.2 Keratometry
Keratometry is calculated through the position of 32 projected light reections. Two
rings, with sixteen measuring points on each eye are arranged in two rings with the
following diameters
(standard eye R=7.8 mm) Outer measuring points:
Inner measuring points:
2.3 mm
1.65 mm
For each measuring point, the equivalent of an ideal
sphere is calculated.
The values displayed (at radius, steep radius) corre‑
spond to the radii of an ellipsoid that ts into the array
of points. The axis of its rotation is measured count‑
er-clockwise from the horizontal to the at radius (35).
• e: Flat radius
• f: Steep radius
• g: Axis of rotation
35
4.5.3 White-to-white distance
The white‑to‑white distance (WTW) is determined using the image of the iris and
the eye radii obtained from keratometry. The value displayed corresponds to the di‑
ameter of an ideal circle (36).
36
37
4.5.4 Pupillometry & visual axis
Pupil diameter (Ø) corresponds to the diameter of an ideal circle, with the smallest
error perpendicular to the established pupil border. At the same time, the shift of
visual axis towards the centre of the pupil is provided. The calculated dimensions
are located on the theoretically derived level of the iris. The image enlargement
achieved by the refraction of the eye is disregarded (37).
5. Commissioning
Power for the LENSTAR LS 900 is supplied by a medical grade power supply which
is provided with the device. Only use the power supply provided with the device.
5.1 Switching on the device
• Connect the power supply plug to the mains.
• Switch on the PC.
• Start the software on the PC.
5.2 Switching off the device
• Exit the software on the PC.
• Switch off the PC.
• Disconnect the power supply plug from the mains if you do not intend to use the de‑
vice for an extended period of time.
6. Technical data
Type designation:
Dimensions (W x D x H):
LS 900
310 x 260 x 420 mm
6.1 Weight
LENSTAR
LENSTAR APS
6.2 kg
6.6 kg
6.2 Power supply
LENSTAR
LENSTAR APS
FRIWO 3288‑DT12/12 HED
ICCN EXERGY, ELPAC POWER SYSTEMS,
Model: MWA030018B
HS-No: 1020392
HS-No: 1022106
6.2.1 Primary side
Voltage:
Current LENSTAR:
Current LENSTAR APS:
100 – 240 V / 50 – 60 Hz
280 – 140 mA
800 mA
6.2.2 Secondary side
LENSTAR
LENSTAR APS
Voltage:
Current:
Voltage:
Current:
12 V +/‑5%
1 A
18 V +/‑5%
1.7 A
01-IFU_LS900-7220055-04100_eng.indd 12 17.06.2015 10:56:02
To Next Page
Loading...