Eye Doctor Arizona
Eye Surgery Arizona

  Zeiss IOLMaster®
Online Users Instruction Manual V.4
printable version
IOL Power Calculations IOL Power Calculations
Optical Biometry Optical Biometry
Lens Constants Lens Constants
Validation Guidelines
Haag Streit LENSTAR® Haag Streit LENSTAR
Zeiss IOLMaster® Zeiss IOLMaster
IOLMaster VIDEO Tutorial
IOLMaster Manual V.5 Cataract Surgery Arizona
IOLMaster Manual V.4
Quick Reference
Safety Instructions
Setting Up
General Operation Cataract Surgery Arizona
Axial Length (ALM) Cataract Surgery Arizona
Keratometer Cataract Surgery Arizona
Anterior Chamber Depth Cataract Surgery Arizona
Silicone Oil
Technical Specifications
License Agreement
Zeiss Declaration
IOL Master Manual Download IOLMaster Checklist (pdf)
IOL Master Manual Download IOLMaster Manual V.4 (pdf)
IOL Master Manual Download IOLMaster Manual V.3 (pdf)
SIA Calculator
Physician Downloads SIA Calculator
Special Thanks

Zeiss IOLMaster Customer Service: 1-877-486-7473 ext. 4030

IOLMaster — Technical Specifications.

Basic Device
Dimensions (footprint)


  390 mm x 300 mm

max. 610 mm (headrest)

approx. 18 kg
Cataract Surgery Arizona
Rated voltage; frequency
Cataract Surgery Arizonabasic device
100 … 240 V AC (±10%); 50 / 60 Hz
Cataract Surgery Arizona
Power consumption
Cataract Surgery Arizonabasic unit
90 VA
Cataract Surgery Arizona
Earth conductor

Protection class
Protection type
Device type
  Device should be connected only to sockets with an intact earth conductor
IP 20
B (DIN EN 6061-1)

Power Isolation Transformer
Rated voltage, frequency   100 … 127V AC (±10%); 60 HZ
or 220 … 240 V AC (±10%); 50 Hz
Cataract Surgery Arizona
Power consumption   max. 115 VA (Total power consumption of connected external devices)
Cataract Surgery Arizona
Fuses   2 x T3.15 A H 250 V 5x20 IEC 60127 for 100 … 127 V AC
2 x T1.6 A H 250 V 5x20 IEC 60127 for 220 … 240 V AC

Ambient Conditions for Intended Use
  Temperature   10 … 30 °C
  Relative humidity   30 … 75% non-condensing
  Atmospheric pressure   800 … 1060 hPa

Storage Environment
  Temperature   -10 … +55 °C
  Relative humidity   10 … 95% (no condensation)
  Atmospheric pressure   700 … 1060 hPa

Ambient Conditions for Storage and Transport
(in original packaging)
  Temperature   -10 … +70 °C
  Relative humidity   10 … 95% (no condensation)
  Atmospheric pressure   500 … 1060 hPa

Measuring Range
  Axial length
    Resolution of display
14 … 40 mm
0.01 mm

    Resolution of display
5 … 10 mm
0.01 mm

  Anterior chamber depth
    Resolution of display
1.5 … 6.5 mm
0.01 mm

  White To White
    Resolution of display
8 … 16 mm
0.1 mm

Cataract Surgery Arizona
Comparison / Reproducibility
Comparison results of IOL Master versus
conventional measurements at the human eye*

Axial length*

Corneal curvature**

Anterior chamber depth*
Mean value:

-0.03 mm

-0.01 mm

+0.12 mm
Standard deviation:

± 0.21 mm

± 0.06 mm

± 0.18 mm
Cataract Surgery Arizona
IOLMaster reproducibility***

Axial length

Corneal curvature

Anterior chamber depth

Relative to standard deviation in human eye

± 0.0256 mm

± 0.0129 mm

± 0.0334 mm




In comparison to precision immersion ultrasound instrument1

In comparison to the manual keratometer1

Standard deviation (basic calculated simple standard deviation)2

acc. to abstract "First experiences with a New Optical Biometry System" by B.A.M. Lege, W. Haigis

acc. to "Reproducibility of Measurement in Optical Biometry: Intraobserver and Interobserver Variability" by A. Vogel, B. Dick
Optical Radiation

Surrounding field illumination/ WTW determination:

Cataract Surgery ArizonaWavelength
Cataract Surgery ArizonaDelivered power
880 nm
< 100µW
Cataract Surgery Arizona

Axial length measurement:

Cataract Surgery ArizonaWavelength
Cataract Surgery ArizonaMax. power for measurement
Cataract Surgery ArizonaMax. power for alignment
Cataract Surgery ArizonaMeasuring time individual meas.
Cataract Surgery ArizonaPulse width
Cataract Surgery ArizonaNumber possible individual meas.
Cataract Surgery ArizonaLaser class
Cataract Surgery ArizonaEmbedded (not accessible)
  Semiconductor diode laser (MMLD)
780 nm
450 µW
80 µW

0.5 s
20 per eye and day
Cataract Surgery Arizona
Fixation light for keratometer and anterior chamber
depth measurement and WTW determination

Cataract Surgery ArizonaWavelength
Cataract Surgery ArizonaDelivered power Cataract Surgery Arizona
590 nm
< 1 µW
Cataract Surgery Arizona
Illumination for keratometer measurement

Cataract Surgery ArizonaWavelength
Cataract Surgery ArizonaDelivered power Cataract Surgery Arizona
880 nm
< 50 µW
Cataract Surgery Arizona
Slit illumination for anterior chamber depth measurement, integral irradiance

  UV (300 … 400 nm)
IR (700 … 1100 nm)
  0.00087 mW cm-2
0.04 mW cm-2
(in spectral range of 860-110 nm no detectable emission from light source)
122.8 W (m2 sr)-1
125.5 W (m2 sr)-1
Cataract Surgery Arizona
Spectral Irradiance

Spectral irradiance of slit illumination (white LED) determined in optical axis (0°) and at an angle of 33° –

Cataract Surgery Arizona

"Optical axis" or "0°" corresponds to the direct view into the illuminating projector. 33° is the angle for the intended use in anterior chamber depth measurement.


Spectrally assessed photochemical radiation densities:

Photochemical radiation density of light source (white LED - slit illumination) for the phakic eye L B=122.8 W/(m2 sr)

Cataract Surgery Arizona

Photochemical radiation density of a light source (white LED - slit illumination) for the aphakic eye L A=125.5 W/(m2 sr)

Cataract Surgery Arizona

The spectrally assessed photochemical radiation densities LB and LA are a measure of the possibility of photochemical damage of the retina through light. LB represents the measure for the phakic eye, LA represents the measure for the aphakic eye or for the eyes of very young children. Readings of LB and LA more than 800 W(m2sr)1 are considered high. The radiation dose of the retina for a photochemical risk is calculated as the product of radiation density and exposure time.

The recommended radiation dose is based on calculations of the American Conference of Governmental and Industrial Hygienists (ACGIH) Threshold Limit Values for Chemical Substances and Physical Agents (Edition: 1995-1996).

The measured photometric values of the IOLMaster are far below the levels that are regarded as high. Thus, the risk of damage through optical radiation is extremely low. Nevertheless, anterior chamber depth measurement with the IOLMaster should be limited to the time absolutely necessary for the diagnosis. The risk of damage may be higher, if fundus photography of the patient to be examined has been taken within the last 24 hours.

Technical details and delivery package subject to change.


IOLMaster Help

Zeiss IOLMaster® Tutorial Version 4

Zeiss IOLMaster®

Optical Biometry

Intraocular Lens Power Calculations

East Valley Ophthalmology
5620 East Broadway Road
Mesa, Arizona 85206

Tel: +1-480-981-6111
FAX: +1-480-985-2426

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