Used both AL and K to predict ELP. These remain widely used today.
Used a simple regression equation; often inaccurate for very long or short eyes. Biometry & IOL Power Calculations - PDF
Once measurements are taken, they are plugged into mathematical formulas to predict the necessary lens power. These formulas have evolved through "generations" based on how they estimate the —the final resting place of the IOL in the eye. Used both AL and K to predict ELP
Patients who have had LASIK or PRK have altered corneal shapes that traditional formulas often miscalculate. Biometry & IOL Power Calculations - PDF
Biometry is the measurement of the eye's physical dimensions. To calculate the correct IOL power, surgeons need two primary measurements:
Very high myopes (long eyes) or hyperopes (short eyes) require specialized formulas like the Wang-Koch adjustment.
