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Outcomes you can trust
IOLMaster 700® from ZEISS gives you the confidence to move from measurement to mastery, by delivering reliable data, cornea insights, and seamless integration into your daily workflow.
More confidence with more options, now featuring Kane and Kane Toric formulas, Barrett True-K Toric, and Barrett True-K with TK.
Because when every eye is different, confidence is not optional.
Measure with confidence
With a device trusted worldwide, powered by advanced SWEPT Source OCT, ZEISS IOLMaster 700 combines 25+ years of expertise with scientific footprint to help you trust every measurement.
Master complex corneas
With leading technology and Total Keratometry (TK®), posterior corneal surface measurements are seamlessly integrated into IOL power calculations directly on the device.
At the same time, Central Topography delivers corneal insights that are particularly valuable in post-refractive eyes, toric IOL planning, irregular corneas, and other challenging biometry scenarios.
Total Keratometry
Replacing assumptions with measurements
Total Keratometry (TK*) combines unique telecentric keratometry measurement of the anterior corneal surface with measurement of the posterior corneal surface.
Total Keratometry for post-refractive patients
A recent study conducted by Michael Lawless, James Y. Jiang, Chris Hodge, Gerard Sutton, Timothy V. Robert and Graham Barrett found that in post-myopic LASIK eyes the Barrett True K formula with TK improved the outcome predictions compared to the Barrett True K with Classic Ks within ±0.5 D by >12 % (p = 0.04)1.
![A ZEISS Meditec device is displayed prominently on a circular podium alongside a computer monitor, with a vibrant blue gradient background.]({"xsmall":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/media/iol_master_stage_image.jpg/_jcr_content/renditions/original.image_file.100.56.0,0,2839,1598.file/iol_master_stage_image.jpg","small":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/media/iol_master_stage_image.jpg/_jcr_content/renditions/original.image_file.360.203.0,0,2839,1598.file/iol_master_stage_image.jpg","medium":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/media/iol_master_stage_image.jpg/_jcr_content/renditions/original.image_file.768.432.0,0,2839,1598.file/iol_master_stage_image.jpg","large":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/media/iol_master_stage_image.jpg/_jcr_content/renditions/original.image_file.1024.576.0,0,2839,1598.file/iol_master_stage_image.jpg","xlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/media/iol_master_stage_image.jpg/_jcr_content/renditions/original.image_file.1280.720.0,0,2839,1598.file/iol_master_stage_image.jpg","xxlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/media/iol_master_stage_image.jpg/_jcr_content/renditions/original.image_file.1440.810.0,0,2839,1598.file/iol_master_stage_image.jpg","max":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/media/iol_master_stage_image.jpg/_jcr_content/renditions/original.image_file.1920.1080.0,0,2839,1598.file/iol_master_stage_image.jpg"})
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![]({"xsmall":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg/_jcr_content/renditions/original.image_file.100.56.0,0,4334,2438.file/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg","small":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg/_jcr_content/renditions/original.image_file.360.203.0,0,4334,2438.file/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg","medium":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg/_jcr_content/renditions/original.image_file.768.432.0,0,4334,2438.file/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg","large":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg/_jcr_content/renditions/original.image_file.1024.576.0,0,4334,2438.file/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg","xlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg/_jcr_content/renditions/original.image_file.1280.720.0,0,4334,2438.file/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg","xxlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg/_jcr_content/renditions/original.image_file.1440.810.0,0,4334,2438.file/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg","max":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg/_jcr_content/renditions/original.image_file.1920.1080.0,0,4334,2438.file/iol_master_700_study_spotlight_accuracy_in_astigmatism_correction_en.jpg"})
![Portrait of Douglas D. Koch, M.D., wearing a light purple button-down shirt and resting his hands on ophthalmic equipment in a softly lit examination room.]({"xsmall":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg/_jcr_content/renditions/original.image_file.100.100.127,140,1266,1279.file/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg","small":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg/_jcr_content/renditions/original.image_file.360.360.127,140,1266,1279.file/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg","medium":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg/_jcr_content/renditions/original.image_file.768.768.127,140,1266,1279.file/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg","large":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg/_jcr_content/renditions/original.image_file.1024.1024.127,140,1266,1279.file/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg","xlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg/_jcr_content/renditions/original.image_file.1139.1139.127,140,1266,1279.file/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg","xxlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg/_jcr_content/renditions/original.image_file.1139.1139.127,140,1266,1279.file/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg","max":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/optical-biometers/iolmaster-700/images/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg/_jcr_content/renditions/original.image_file.1139.1139.127,140,1266,1279.file/ddk_2026_douglaskochmd_photobymichaelcothran_2.jpg"})
![ZEISS ARTEVO 750 surgical microscope with integrated monitor displaying an eye's image.]({"xsmall":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-750/artevo-750-beautyshot-no-background_shade.jpg/_jcr_content/renditions/original.image_file.100.100.408,292,1400,1284.file/artevo-750-beautyshot-no-background_shade.jpg","small":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-750/artevo-750-beautyshot-no-background_shade.jpg/_jcr_content/renditions/original.image_file.360.360.408,292,1400,1284.file/artevo-750-beautyshot-no-background_shade.jpg","medium":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-750/artevo-750-beautyshot-no-background_shade.jpg/_jcr_content/renditions/original.image_file.768.768.408,292,1400,1284.file/artevo-750-beautyshot-no-background_shade.jpg","large":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-750/artevo-750-beautyshot-no-background_shade.jpg/_jcr_content/renditions/original.image_file.992.992.408,292,1400,1284.file/artevo-750-beautyshot-no-background_shade.jpg","xlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-750/artevo-750-beautyshot-no-background_shade.jpg/_jcr_content/renditions/original.image_file.992.992.408,292,1400,1284.file/artevo-750-beautyshot-no-background_shade.jpg","xxlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-750/artevo-750-beautyshot-no-background_shade.jpg/_jcr_content/renditions/original.image_file.992.992.408,292,1400,1284.file/artevo-750-beautyshot-no-background_shade.jpg","max":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-750/artevo-750-beautyshot-no-background_shade.jpg/_jcr_content/renditions/original.image_file.992.992.408,292,1400,1284.file/artevo-750-beautyshot-no-background_shade.jpg"})
![ZEISS ARTEVO 850 with dual screens displaying detailed retinal images, mounted on mobile units with articulating arms.]({"xsmall":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-850/artevo_850_beautyshot_nobackground_shade.jpg/_jcr_content/renditions/original.image_file.100.100.426,190,1407,1171.file/artevo_850_beautyshot_nobackground_shade.jpg","small":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-850/artevo_850_beautyshot_nobackground_shade.jpg/_jcr_content/renditions/original.image_file.360.360.426,190,1407,1171.file/artevo_850_beautyshot_nobackground_shade.jpg","medium":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-850/artevo_850_beautyshot_nobackground_shade.jpg/_jcr_content/renditions/original.image_file.768.768.426,190,1407,1171.file/artevo_850_beautyshot_nobackground_shade.jpg","large":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-850/artevo_850_beautyshot_nobackground_shade.jpg/_jcr_content/renditions/original.image_file.981.981.426,190,1407,1171.file/artevo_850_beautyshot_nobackground_shade.jpg","xlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-850/artevo_850_beautyshot_nobackground_shade.jpg/_jcr_content/renditions/original.image_file.981.981.426,190,1407,1171.file/artevo_850_beautyshot_nobackground_shade.jpg","xxlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-850/artevo_850_beautyshot_nobackground_shade.jpg/_jcr_content/renditions/original.image_file.981.981.426,190,1407,1171.file/artevo_850_beautyshot_nobackground_shade.jpg","max":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/surgical-microscopes/artevo-850/artevo_850_beautyshot_nobackground_shade.jpg/_jcr_content/renditions/original.image_file.981.981.426,190,1407,1171.file/artevo_850_beautyshot_nobackground_shade.jpg"} "ZEISS ARTEVO 850")
![Computer monitor displaying a side-by-side comparison of two ophthalmic surgery videos.]({"xsmall":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/data-management-software/eq-workplace/images/zeiss-eq-workplace-us-stage.png/_jcr_content/renditions/original.image_file.100.100.267,80,1769,1582.file/zeiss-eq-workplace-us-stage.png","small":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/data-management-software/eq-workplace/images/zeiss-eq-workplace-us-stage.png/_jcr_content/renditions/original.image_file.360.360.267,80,1769,1582.file/zeiss-eq-workplace-us-stage.png","medium":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/data-management-software/eq-workplace/images/zeiss-eq-workplace-us-stage.png/_jcr_content/renditions/original.image_file.768.768.267,80,1769,1582.file/zeiss-eq-workplace-us-stage.png","large":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/data-management-software/eq-workplace/images/zeiss-eq-workplace-us-stage.png/_jcr_content/renditions/original.image_file.1024.1024.267,80,1769,1582.file/zeiss-eq-workplace-us-stage.png","xlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/data-management-software/eq-workplace/images/zeiss-eq-workplace-us-stage.png/_jcr_content/renditions/original.image_file.1280.1280.267,80,1769,1582.file/zeiss-eq-workplace-us-stage.png","xxlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/data-management-software/eq-workplace/images/zeiss-eq-workplace-us-stage.png/_jcr_content/renditions/original.image_file.1440.1440.267,80,1769,1582.file/zeiss-eq-workplace-us-stage.png","max":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/data-management-software/eq-workplace/images/zeiss-eq-workplace-us-stage.png/_jcr_content/renditions/original.image_file.1502.1502.267,80,1769,1582.file/zeiss-eq-workplace-us-stage.png"})
![A ZEISS medical imaging device on wheels with a screen displaying an eye examination. ZEISS QUATERA 700.]({"xsmall":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/phacoemulsificationvitrectomysystems/quatera/images/zeiss_quatera_700_white_background.jpg/_jcr_content/renditions/original.image_file.100.100.591,591,2410,2410.file/zeiss_quatera_700_white_background.jpg","small":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/phacoemulsificationvitrectomysystems/quatera/images/zeiss_quatera_700_white_background.jpg/_jcr_content/renditions/original.image_file.360.360.591,591,2410,2410.file/zeiss_quatera_700_white_background.jpg","medium":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/phacoemulsificationvitrectomysystems/quatera/images/zeiss_quatera_700_white_background.jpg/_jcr_content/renditions/original.image_file.768.768.591,591,2410,2410.file/zeiss_quatera_700_white_background.jpg","large":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/phacoemulsificationvitrectomysystems/quatera/images/zeiss_quatera_700_white_background.jpg/_jcr_content/renditions/original.image_file.1024.1024.591,591,2410,2410.file/zeiss_quatera_700_white_background.jpg","xlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/phacoemulsificationvitrectomysystems/quatera/images/zeiss_quatera_700_white_background.jpg/_jcr_content/renditions/original.image_file.1280.1280.591,591,2410,2410.file/zeiss_quatera_700_white_background.jpg","xxlarge":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/phacoemulsificationvitrectomysystems/quatera/images/zeiss_quatera_700_white_background.jpg/_jcr_content/renditions/original.image_file.1440.1440.591,591,2410,2410.file/zeiss_quatera_700_white_background.jpg","max":"https://www.zeiss.com/content/dam/med-hcp/reference-master/product-portfolio/phacoemulsificationvitrectomysystems/quatera/images/zeiss_quatera_700_white_background.jpg/_jcr_content/renditions/original.image_file.1819.1819.591,591,2410,2410.file/zeiss_quatera_700_white_background.jpg"})