Analysis Of The Benefit Of Adding Posterior Keratometry To 4 Modern Intraocular Lens Power Formulas In Myopic Laser Vision Correction Eyes
Published 2026 - 44th Congress of the ESCRS
Reference: POCAT606 | Type: Free paper | DOI: 10.82333/j88g-yt85
Authors: Dr Yea Eun Lee 1 , Ms Jeewon Han 1 , Prof. Dr Kenneth J. Hoffer 2 , Dr Nahyun Park 1 , Dr Chung Min Lee 1 , Mr Carson Yu 3 , Dr So Hyun Yu 4 , Dr Sang Yoon Kim 4 , Dr Myung Sun Song 1 , Dr Tae Yeon Kim 1 , Dr Tae Hun Kim 1 , Dr Yoo Young Jeon 1 , Dr Kyu Sang Eah 1 , Prof. Dr Ho Seok Chung 1 , Prof. Dr Jae Yong Kim 1 , Dr Kyung Min Koh 4 , Dr Giacomo Savini 5 , Prof. Dr Hun Lee* 6
1Ophthalmology,Asan Medical Center, University of Ulsan College of Medicine,Seoul,Korea, Republic Of, 2Ophthalmology,Stein Eye Institute, University of California,Los Angeles,United States;Ophthalmology,St. Mary's Eye Center,Santa Monica,United States, 3Vanderbilt University School of Medicine,Nashville,United States, 4Ophthalmology,Kim's Eye Hospital,Seoul,Korea, Republic Of, 5Ophthalmology,IRCCS Bietti Foundation,Rome,Italy, 6Ophthalmology,Asan Medical Center, University of Ulsan College of Medicine,Seoul,Korea, Republic Of;Ophthalmology,Brain Korea 21 project, University of Ulsan College of Medicine,Seoul,Korea, Republic Of
Purpose
To evaluate the accuracy of 4 intraocular lens (IOL) power calculation formulas for eyes that have undergone myopic laser vision correction (LVC) and to analyze the effect of incorporating posterior keratometry (PK) on prediction accuracy.
Setting
Single center, Republic of Korea
Methods
Four modern IOL power calculation formulas, with and without PK measurements, were evaluated using the Eyetemis online tool. Subgroup analyses were performed based on axial length (AL) as well as mean keratometry (K).
Results
In the total sample, median absolute SEQ-PE values ranged from 0.30 D to 0.42 D across formulas. The Barrett True K-PK and Hoffer QST-PK achieved the lowest median absolute SEQ-PE values (0.30 D and 0.31 D, respectively). Based on absolute SEQ-PE thresholds, 60% to 72% of eyes were within ±0.50 D and 88% to 94% were within ±1.00 D, with no statistically significant differences observed among formulas. Across all four subgroups, the EVO 2.0 formulas (either K or PK) achieved the lowest median absolute SEQ-PE values, ranging from 0.20 D to 0.36 D. Incorporating PK values resulted in significantly better outcomes in many comparisons, particularly in eyes with AL > 26 mm and mean K ≤ 40 D.
Conclusions
The BTK-PK, EVO 2.0-PK, and Hoffer QST-PK formulas demonstrated a trend toward higher accuracy in our study population, and incorporating PK values improved predictive accuracy, with more pronounced benefits in eyes with long AL and flat corneal curvature.