Intraocular Lens Power Calculations in Eyes With Prior Hyperopic LASIK or PRK

Hamill, Eric

Intraocular Lens Power Calculations in Eyes With Prior Hyperopic LASIK or PRK

Tuesday, April 29, 2014: 10:51 AM

Room 151B (Boston Convention and Exhibition Center)

Eric B. Hamill, BA, Baylor College of Medicine, Houston, TX, USA

Li Wang, MD, PhD, Baylor College of Medicine, Houston, TX, USA

Bruna V. Ventura, MD, Altino Ventura Foundation, Recife, Brazil

Warren E. Hill, MD, East Valley Ophthalmology, Mesa, AZ, USA

Hayley K. Chopra Houston, TX, USA

Douglas D. Koch, MD, Cullen Eye Institue, Baylor College of Medicine, Houston, TX, USA

Narrative Responses:

Purpose
To evaluate the accuracy of IOL power calculations in patients with prior hyperopic refractive surgery.

Methods
This is a two-center study of 35 eyes with all historical data available. Targeting at actual refraction following cataract surgery, IOL power was predicted using the Masket and Modified-Masket methods with the double-K Holladay 1 and double-K HofferQ formulas, Haigis-L, and Shammas-PL formulas. The IOL prediction errors were calculated by subtracting the IOL powers predicted by these different formulas from the implanted IOL powers.

Results
For the Masket and Modified-Masket methods, respectively, double-K Holladay 1 formula gave IOL prediction errors of 0.02 ± 1.11 D (mean ± SD) and 0.37 ± 1.18 D, and double-K HofferQ formula gave IOL prediction errors of 0.18 ± 1.09 D and 0.54 ± 1.17 D. The IOL prediction errors were -0.17 ± 1.07 D for Haigis-L formula, and -0.30 ± 1.04 D for the Shammas-PL formula. There were no significant differences among the variances of IOL prediction errors (P>0.05).

Conclusion
Our results demonstrate comparable consistency of performance by these formulas.