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You are on our international English website. This site features our entire product portfolio worldwide. The products featured may not be available in the US. If you are a citizen from the US, please visit your country website for local information and contacts.
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Unlock TK with our experts

Kamran Riaz, Giacomo Savini, Tun Kuan Yeo, Mitchell Weikert and Jascha Wendelstein

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TK in post-LVC eyes

Hear how experts approach IOL calculations in post-LVC eyes and why measured posterior corneal power and TK have become part of their daily routine.
Hear how experts are transforming post-LVC planning with TK.

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TK in toric IOL calculation

Explore how surgeons look at posterior corneal astigmatism and why they consider TK when planning toric IOLs.

Learn how experts use TK to refine toric IOL decision-making.

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TK in keratoconus eyes

Learn how surgeons navigate IOL calculations in eyes with keratoconus and adapt their approach across different clinical situations.

Explore how experts approach IOL calculation with TK in eyes with keratoconus.

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TK in normal eyes

Learn how and when to make more decisions with additional insights provided by Total Keratometry values beyond relying on anterior keratometry values only.

What is Total Keratometry?

Total Keratometry (TK®) combines unique telecentric keratometry measurement of the anterior corneal surface with measurement of the posterior corneal surface.

How it works

  • Traditional Keratometry: Measures only the front surface of the cornea and uses a mathematical estimate (a constant refractive index) to guess the curvature and power of the back surface.1,2
  • Total Keratometry: Uses advanced technology (like Swept-Source OCT) to measure the posterior cornea and corneal thickness, replacing estimations with exact measurements.3,4,5

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