Accuracy of Intraocular Lens Power Calculation Based on Distance from Haptic to Principal Object Plane
Youngsub Eom1,2,3, Seul Ki Yang4,5, Minji Woo1
1Department of Ophthalmology, Korea University Ansan Hospital, Gyeonggi-do, Republic of Korea.
Journal of Cataract and Refractive Surgery
|January 22, 2025
Summary
The foremost haptic to principal object plane (H-POP) significantly impacts intraocular lens (IOL) power calculations more than the optic
Area of Science:
- Ophthalmology
- Optical Engineering
Background:
- Accurate intraocular lens (IOL) power calculation is crucial for refractive outcomes after cataract surgery.
- The precise positioning of the IOL, influenced by optic and haptic geometry, affects predictability.
Purpose of the Study:
- To evaluate the influence of the distance from the optic's anterior surface to the principal object plane (POP) and the foremost haptic to the principal object plane (H-POP) on IOL power calculation accuracy.
- To determine which distance metric (POP or H-POP) has a greater impact on IOL power prediction error for the ICB00 IOL.
Main Methods:
- Optical simulation and retrospective analysis of 102 eyes implanted with the ICB00 IOL.
- Analysis correlated changes in POP and H-POP with prediction error using the Barrett Universal II formula across varying IOL powers.
Main Results:
- The ICB00 IOL exhibited minor POP fluctuations (0.21-0.30 mm) with power changes.
- H-POP varied significantly, peaking at 0.60 mm at 16.0 D and decreasing to 0.14 mm at 34.0 D.
- Prediction error patterns closely mirrored H-POP changes, with a significant myopic shift beyond 16.0 D (R²=0.178).
Conclusions:
- The H-POP demonstrates a greater influence on ICB00 IOL power calculations compared to the POP.
- Accurate IOL power prediction necessitates comprehensive geometric data from manufacturers for precise H-POP calculation.
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