lenstar LS 900 - Illumination Modalities

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DEUTSCHENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
PORTUGUÊS
SVENSKA
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
PORTUGUÊS
SVENSKA
© HAAG-STREIT AG, 3098 Koeniz, Switzerland – HS-Doc. no. 1500.7220055.04100 – 10. Edition / 2015 – 06
6.3 Illumination modalities
6.3.1 Eyelengthmeasurement(A-Scan)andcentralxation
Light source:
Wavelength:
Power on patient’s eye:
Superluminescent diode
820 nm
< 0.6 mW
6.3.2 Keratometry
Light source:
Wavelength:
LED
950 nm
6.3.3 Illumination
Serial number of the system
Up to 1999* From 2000
Light source: LED LED
Light colour: Green White
* Devices with a serial number < 1999 can be subsequently converted to white light illumination
6.3.4 Positioning aid (from serial number 2000)
Light source:
Wavelength:
LED
940 nm
6.4 Measured variables Lenstar LS 900
Measurement ranges are based on the ‘Phakic’ measurement mode.
6.4.1 Central corneal thickness (CCT)
Measurement range:
Display resolution:
In vivo repeatability (1.SD):
300 – 800 μm
1 μm
±2.3 μm
6.4.2 Anterior chamber depth (ACD)
Measurement range:
Display resolution:
In vivo repeatability (1.SD):
1.5 – 6.5 mm
0.01 mm
±0.04 mm
6.4.3 Lens thickness (LT)
Measurement range:
Display resolution:
In vivo repeatability (1.SD):
0.5 – 6.5 mm
0.01 mm
±0.08 mm
6.4.4 Axial length (AL)
Measurement range:
Display resolution:
In vivo repeatability (1.SD):
14 – 32 mm
0.01 mm
±0.035 mm
6.4.5 Keratometry (R)
Measurement range radius:
Display resolution:
In vivo repeatability (1.SD):
Measuring area of axial angle:
Display resolution:
In vivo repeatability (1.SD):
5 – 10.5 mm
0.01 mm
±0.03 mm
0 – 180°
1°
±11°
6.4.6 White-to-white distance (WTW)
Measurement range:
Display resolution:
In vivo repeatability (1.SD):
7 – 16 mm
0.01 mm
±0.04 mm
6.4.7 Pupillometry
Measurement range:
Display resolution:
2 – 13 mm
0.01 mm
The above mentioned measurement ranges correspond to the default setting for the
automatic analysis. The in vivo reproducibility was evaluated in a clinical study of
cataract patients (see Tables 1 "All eyes" and 2 "Special eyes")
6.4.8 Study design
• The clinical trial for deriving in vivo reproducibility was approved by the local ethics
committee. The study was planned and conducted as a prospective, non‑randomised
comparative study.
• Two phases were scheduled in the approved study protocol. In the rst phase, mea‑
surements of axial length (AL), central corneal thickness (CCT), anterior chamber
depth (ACD), central lens thickness (LT), median corneal radius (R) and the axis posi‑
tion of the at meridian (axis) were taken.
• The white‑to‑white distance (WTW) was measured in the second phase.
01-IFU_LS900-7220055-04100_eng.indd 13 17.06.2015 10:56:02