Defining biometry for almost 20 years. ZEISS Optical Biometers

Optical biometers from ZEISS

A success story with more than 100 million IOL power calculations to date

Almost 20 years ago, ZEISS introduced the first optical biometer and revolutionized IOL power calculations. Since then IOLMaster® biometers have become the most commonly used biometers in the ophththalmic world with more than 100 million IOL power calculations to date. After introducing and continually improving PCI for biometry measurements, ZEISS launched its first SWEPT Source OCT-based biometer in 2014. Continuing to innovate on this platform, ZEISS just introduced Total Keratometry and is already working on the next innovations to remain the leader in optical biometry.

Optical biometry insights

Study Spotlight:
ZEISS IOLMaster 700

Samuel F. Passi, Atalie C. Thompson and Preeya K. Gupta compared the efficiency of the ZEISS IOLMaster 700 vs. LENSTAR LS 900.

TK more accurate for IOL calculation?

Sabong Srivannaboon provides insights into initial clinical data and looks at whether TK will be more accurate for IOL calculation.

Measuring the cornea: Why we need to do better

Dr. Koch answers the question about why direct measurement of the posterior corneal surface is needed to improve IOL power calculation.

ZEISS IOLMaster biometers

Defining optical biometry for almost 20 years

ZEISS IOLMaster 700

Now featuring Total Keratometry (TK®), this SWEPT Source OCT optical biometer is made for cataract surgeons implanting toric or multifocal IOLs that require superior measurements.

ZEISS IOLMaster 500

The continually refined gold standard in optical biometry is designed for cataract surgeons looking for a fast, reliable and easy-to-use optical biometer with a great price-to-value ratio.

Comparison of ZEISS optical biometers


ZEISS IOLMaster 700 ZEISS IOLMaster 500

Technological basis

SWEPT Source OCT, image-based B-scan biometry

Partial coherence interferometry (PCI), A-scan biometry

IOL calculation formulas

Licence Total Keratometry1: Barrett TK Universal II and Barrett TK Toric; Barrett Suite(includes Barrett Toric, Barrett True-K & Barrett Universal II); Haigis Suite (includes Haigis, Haigis-L, Haigis-T); Hoffer® Q, Holladay 1 and 2, SRK®/T

Haigis, Haigis-L, Hoffer® Q, Holladay 1 and 2, SRK® II, SRK® / T

Ease of use

Traffic light indicators, automatic mode, plausibility checks, multi-touch screen

Traffic light indicators, automatic mode, plausibility checks

Cataract penetration rate

> 99%3

> 93%3

Measurement speed for two eyes

< 45 sec4

< 60 sec4

Keratometric measurement

Telecentric (3 zones), anterior & posterior (Total Keratometry)

Telecentric, anterior

Fixation Check


Patented Cornea-to-Retina Scan


Lens thickness


ZEISS EQ Workplace

Streamline your refractive cataract workflow

The EQ Workplace® from ZEISS supports you to save time during pre-operative processes, further protect against never-events, access your data from anywhere and personalize your IOL constants.

Services in focus


Support when you need it

Do you rely on high system availability? If your answer is yes, then why not consider our ZEISS OPTIME service agreements, which are designed to ensure the readiness of your medical equipment at all times.

ZEISS financial solutions

Support with tight budgets

Want the latest technology from ZEISS but have a tight budget? ZEISS Financial Solutions may well have the right financing options for you.


For medical equipment

Need immediate support? ZEISS Remote Service offers online support for customers with ZEISS OPTIME advanced and ZEISS OPTIME complete agreements.

Optimized lens constants


Download optimized lens constants for more than 300 IOL models based on the data from over 50,000 cataract surgeries.

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