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Standard keratometry values perform better compared to total keratometry values in eyes undergoing concurrent cataract surgery and DMEK


Results concluded that K did better than TK in a variety of situations.

The study, “Accuracy of Multivariable IOL Formulas Using K and TK in Eyes. Undergoing Combined Cataract Surgery and DMEK," was presented by Asher Khan, BS, a research fellow at Dean McGee Eye Institute.

This retrospective review assessed and compared the accuracy of IOL formulas using K and TK values in eyes undergoing concurrent cataract surgery and DMEK.

Result takeaways:

  • K did better than TK
  • “Adjusted” K-6 performed the best
  • Multivariable formulas (Kane, K-6, EVO, and DGS) performed strongly
  • SRK/T also had a relatively strong performance
  • Haigis and Barrett did poorly with TK values


  • IOL calculations remain challenging in combined phaco/DMEK eyes
  • Every formula performed better with K than with TK
  • Multivariable formulas (Kane, K-6, EVO, and DGS) with K values performed the best
  • While TK values can be helpful in other eyes (such as KCN or post-refractive), we advise that surgeons utilize K values when performing combined Phaco/DMEK surgery
"Use K when doing phaco/DMEK, K?" - Asher Khan, BS
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