The current keratometry standard in IOL power calculation is to only measure the anterior corneal surface and then estimate the total corneal power using model eye assumptions or nomograms. However, this method does not address outliers in cases of unusual corneas, which could result in refractive surprises.
With a software update due for release in 2018, the ZEISS IOLMaster 700 with SWEPT Source OCT technology allows you to directly measure the posterior corneal surface. It combines unique telecentric keratometry measurement of the anterior corneal surface with measurement of the posterior corneal surface in order to calculate Total Keratometry (TK®).
Total Keratometry has the potential to reduce refractive surprises to a minimum.Graham Barrett, M.D.
This compendium provides an overview on:
- Why it’s important to measure the posterior corneal surface.
- How TK differs from existing solutions.
- Very promising initial clinical results.
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Han Bor Fam, M.D.
In this lecture Han Bor Fam presents early clinical data using the IOLMaster 700 with Total Keratometry.
Sabong Srivannaboon, M.D.
Sabong Srivannaboon provides insights into first clinical data and looks at whether TK will be more accurate for IOL calculation.
Douglas D. Koch M.D.
Dr. Koch answers the question about why direct measurement of the posterior corneal surface is needed to improve IOL power calculation.