Refraction Prediction

HM-ZL formula

An IOL power calculation formula for highly myopic eyes-developed by Zhu and Lu

Information with * need to be filled for calculation.

K Index*

Assigned Gender

Last Name

First Name

AL* (Best with AL ≥ 26.00mm)

ACD* (mm)

K1* (D) (K1≤K2)

K2* (D) (K2≥K1)

LT* (mm)

WTW* (mm)

A Constant* (Our preferred A constant Website)

a0*

a1*

a2*

Target Refraction* (D)

Click after finishing the required fields

About

The HM-ZL formula was a novel artificial intelligence-based formula for highly myopic eyes (axial length over 26.00 mm) developed by Zhu and Lu.

Instructions

The HM-ZL formula requires compulsory information input of axial length, anterior chamber depth, lens thickness, white to white distance, flattest and steepest K values (namely the K1 and K2), A-constant, a0, a1, and a2 constants. We recommend using the constants from the ULIB website (http://ocusoft.de/ulib/). A default refractive index of 1.3375 has been selected. If your device uses a different refractive index, please select the appropriate option from the drop-down menu. The training dataset has updated to 31 Dec 2021; we will continue to include new data to improve the performance of the Zhu-Lu formula. If you have any questions or suggestions or want further information about the HM-ZL formula, please contact us at HM_ZLF@163.com.