Revision of ocular biometry using three-dimensional Super Formula for intraocular lens power calculation
R Ashik, Lubna Khan, Kiu MondalPurpose:
The purpose of this study was to evaluate whether the three-dimensional (3D) Super Formula can be used to assess accuracy in ocular biometry.
Setting:
The study setting was the department of ophthalmology, a tertiary care hospital in Central India.
Design:
The study design was a prospective observational study.
Materials and Methods:
Seventy-four eyes with senile cataract underwent biometry using the IOLMaster 500. From each series of readings, either the emmetropia power or the lowest negative power closest to emmetropia was chosen. This intraocular lens (IOL) power, along with axial length and averaged keratometry (K), was computed using the Ladas 3D online calculator. Plots were noted as inside or outside the shaded zone of the Ladas 3D graph. Following cataract surgery, absolute refractive error (ARE) was calculated at 6 weeks as the difference between spherical equivalent and predicted refractive error.
Results:
SRK/T was most used (74.3%), followed by Holladay (17.6%) and Hoffer Q (8.1%). Accuracy did not differ significantly among formulae (
Conclusion:
The Ladas 3D Super Formula graph demonstrated strong concordance with postoperative refractive outcomes. Holladay and SRK/T provided the highest accuracy, supporting its utility in refining biometric precision for IOL power calculation.