BiomPEDI

Input Data

Load from BiomAPI

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Patient

Surgeon

Patient Name

Patient ID

Date of Birth *

Date of Surgery *

Age at Surgery

Biometry

Eye *

Biometer *

AL (mm) *

K Index *

K1 (D) *

K2 (D) *

ACD (mm)

CCT (um)

LT (mm)

WTW (mm)

IOL Parameters

Target Refraction (D) *

Nomogram Suggestion

A-Constant *

IOL Family

About this tool...

Disclaimer

This tool is for research purposes and should be considered experimental. It has NOT been clinically validated.

By using this tool, you agree to waive and hold the author harmless from any claims you may have arising out of your use of these tools.

No personally identifiable information (name and ID) is stored on our servers or transmitted through external API calls.

Description

This tool is designed to assist with IOL calculations in pediatric cataract surgery by providing easy access to an age-based nomogram for target selection.

For children aged two years and older, it also enables axial length (AL) prediction at the age of 15 (hardcoded) using two different algorithms (Trivedi and Dupessey).

IOL calculations are performed for the current AL and target, while simultaneously displaying future predictions based on the predicted ALs, allowing for straightforward comparison.

Standard A-constants for optical biometry can be used even with ultrasound axial lengths (ALs), as these ALs are recalibrated to an optical equivalent (see reference below). Axial lengths obtained by contact ultrasound are automatically increased by 0.1 mm to account for globe compression.

The T2 formula is a two-variable formula requiring only the AL and keratometry (K1 and K2); the other biometric variables are NOT used for calculation.

The Cooke K6 formula is a modern formula requiring reliable optical biometry measurements (disabled for US measurements), including defining the biometer model (defaults to "Optical - Other"). It uses AL, keratometry (K1 and K2), and ACD as mandatory parameters. LT is mandatory if using the Argos biometer, otherwise it is optional. CCT and WTW are optional parameters. The IOL Family field while optional (defaults to Other) specifically refines predictions for some IOLs.

Axial Length Estimates References

Rupal H. Trivedi, Eliza Barnwell, Bethany Wolf, M. Edward Wilson. 2019. "A Model to Predict Postoperative Axial Length in Children Undergoing Bilateral Cataract Surgery with Primary IOL Implantation." American Journal of Ophthalmology.
Dupessey, Florence, Florian Dalmas, Aurore Aziz, Danièle Denis, and Marie Beylerian. 2024. "A New Strategy to Calculate the Intraocular Lens Power in Congenital Cataracts According to Age and Axial Length at Implantation." Acta Ophthalmologica.

Other Relevant References

Cooke, David L., Rhonda Waldron, Giacomo Savini, Kamran M. Riaz, Leonardo Taroni, David A. Murphy, and Fabio Guaraldi. 2021. "Immersion Ultrasound Biometry vs. Optical Biometry." Journal of Cataract and Refractive Surgery. [using the recalibrated ultrasound axial length formula to allow the use of standard optical biometry constants]

IOL Calculations APIs

IOL calculations are performed using external APIs: