© Haag-Streit AG, CH-3098 Koeniz, Switzerland
1500.7220055.04030
Introduction
We would like to thank you for your decision to purchase this Haag-
Streit product.
If the instructions in this manual are carefully followed we are confident
that this product will give you reliable and trouble-free usage.
Purpose of use
The LS 900
®
is a non-invasive, non-contact OLCR (optical low-co-
herence reflectometry) biometer used for obtaining ocular measure-
ments and performing calculations to assist in the determination of
the appropriate power and type of IOL (intraocular lens) for implan-
tation after removal of the natural crystalline lens. The LS 900®
measures:
Axial eye length • Corneal thickness • Anterior chamber depth • Aque-
ous depth • Lens thickness • Radii of corneal curvature of flat and
steep meridian • Axis of the flat meridian • White-to-white distance
• Pupil diameter.
Contents
1 Safety instructions
1.1 General Points . . . . . . . . . . . . . . . . . 5
1.2 Plausibility of measurements . . . . . . . . . 7
1.3 IOL calculation . . . . . . . . . . . . . . . . . 9
1.3.1 References. . . . . . . . . . . . . . . . . . . 9
1.4 IOL constants . . . . . . . . . . . . . . . . . 9
1.4.1 IOL constants derived using
optical measurements . . . . . . . . . . . . . 9
1.4.2 IOL constants derived using immersion
ultrasound measurements . . . . . . . . . . . 9
1.4.3 IOL constants derived using contact
ultrasound measurements . . . . . . . . . . 11
1.5 Electrical connections . . . . . . . . . . . . 11
1.6 Optical radiation . . . . . . . . . . . . . . . 11
1.7 Device transportation . . . . . . . . . . . . 11
1.8 Special notes in text . . . . . . . . . . . . . 11
1.9 Pictograms . . . . . . . . . . . . . . . . . . 13
1.10 Device nameplate . . . . . . . . . . . . . . 13
1.11 Warranty and product liability . . . . . . . . 13
1.12 Statutory regulations . . . . . . . . . . . . . 13
2 Introduction
2.1 Basic construction . . . . . . . . . . . . . . 15
2.2 Examination components (LS 900
®
) . . . 11 / 15
2.3 Control component (PC) . . . . . . . . . . . 17
2.3.1 Minimum PC requirements . . . . . . . . . 17
2.3.1 Minimum monitor requirements . . . . . . . 17
2.4 Instrument table . . . . . . . . . . . . . . . 17
3 Installation
3.1 Safe system configuration . . . . . . . . . . 19
3.2 Instrument table . . . . . . . . . . . . . . . 19
3.2.1 Mounting the roller rails/slide plate . . . . . 19
3.2.2 Automatic position recognition . . . . . . . . 19
3.3 Mounting the device . . . . . . . . . . . . . 21
3.3.2 Wiring cable under the device . . . . . . . . 21
3.3.3 Cables at side (Option) . . . . . . . . . . . 23
3.4 Computer connection . . . . . . . . . . . . 23
3.4.1 Software . . . . . . . . . . . . . . . . . . . 23
4 Operation
4.1 Position of patient during measurement . . . 25
4.2 Fixation . . . . . . . . . . . . . . . . . . . 25
4.3 Measured variables . . . . . . . . . . . . . 25
