9
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© HAAG‑STREIT AG, 3098 Koeniz, Switzerland – HS‑Doc. no. 1500.7220686.04020 – 2. Edition / 2021 – 05
HS reference number
Serial number
Trademark of the manufacturer
Haag-Streit AG
Notes on disposal, see the
'Disposal' chapter
Listed European Authorized
Representative
Medical Device
Testsymbol of TÜV Rheinland
with approval for INMETRO
Brasil
MET Listed Mark with approval
for USA and Canada
Disconnect the plug before
opening the device
Warning for laser beam
Type B applied part
Housing protection
Alternating current
Direct current
2 Introduction
2.1 Basic construction
The Eyestar 900 is an all in one optical biometry device, containing a measuring
head and internal computer for signal processing and display of results. The unit is
operated via a touch screen interface and some buttons at the device housing.
EyeSuite is the software that runs the unit and is pre-installed on the built in
computer. Integral, automatic error recognition for the measurements guarantees
reliable examination results.
2.2 Operating principles
The Eyestar 900 is a non-contact device consisting of a swept source OCT subunit
(OCT: optical coherence tomography, a measurement method to acquire
tomographic images by optical interferometry) and an imaging system sub-unit.
The OCT sub-unit performs a three-dimensional measurement of all refractive
ocular structures in the anterior eye segment (curvatures and locations of anterior
corneal surface, posterior corneal surface, anterior crystalline lens surface, posterior
crystalline lens surface), as well as a one-dimensional measurement of axial eye
length. It also generates cross-sectional images of the anterior eye section and the
central retina. The measurement is implemented by scanning the eye with a
lowpower near-infrared laser beam and measuring the light which is back-reflected
to the device. The imaging system sub-unit is used to obtain photographic images of
the eye. Based on these images, the white-to-white distance and the pupil diameter
are measured. Additionally, these images can serve to document the locations of
special landmarks on the eye, such as blood vessels. Illumination for imaging is
provided by infrared and white-light LEDs (light emitting diodes).
2.3 Eyestar 900 components
1. Forehead rest band (applied part,
removable part)
2. Front illumination (5 pieces)
3. Ocular (left and right)
4. Height adjustable chin rest
(applied part, removable part)
5. Hand grips for patient (applied
part)
6. Multifunction buttons
7. Ventilation groove
8. Device state indicator
9. Touch screen
10. Display port socket
11. LAN port socket (Gigabit)
12. USB port sockets (2 × USB 2.0 / 2
× USB 3.0)
13. Mains switch
14. Fuses (2 × T2AH, 250V)
15. Mains socket
16. Type Plate
17. Power button
18. Connector panel cover
