ZEISS IOLMaster optical biometers
Product Category

ZEISS Optical Biometers

Defining biometry for more than 20 years

More than 20 years ago, ZEISS introduced the first optical biometer and revolutionized IOL power calculations. Since then IOLMaster® biometers from ZEISS have become the most commonly used biometers in the ophthalmic world with more than 150 million IOL power calculations to date.

Optical biometers from ZEISS for all your needs

ZEISS IOLMaster 700

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.

Defining biometry

… did you know?

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

Barrett Suite: Barrett Universal II & Barrett Universal II TK1, Barrett toric & Barrett toric TK1, Barrett True K & Barrett True K with TK1; 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

up to 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

Central Topography


  • 1

    optional; Barrett TK formulas require Barrett Suite

  • 2


  • 3

    R. Varsits, N. Hirnschall, B. Doeller, O. Findl; Increasing the number of successful axial eye length measurements using swept-source optical coherence tomography technology compared to conventional optical biometry; presented at ESCSR 2016.

  • 4

    Depending on experience of operator and eye conditions.