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

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

Conclusions:

• 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