Cataract & IOLs – Pr. Damien Gatinel

Universal IOL Formula Analyser & Optimiser

Tue, 09 Jun 2026 11:58:33 +0000

This tool lets cataract surgeons import their own surgical-outcome data (CSV or Excel) to assess the performance of any IOL power formula and optimise its constants. The statistical analysis is produced within seconds: automatic detection of the relevant columns, normality tests, distribution analysis and publication-ready charts (histograms, box plots, violin plots, cumulative distribution functions, scatter plots with regression). The optimisation relies on the sensitivity-factor method (F = 0.0006(P² + 2KP)) and computes three targets simultaneously, while keeping patient data confidential since everything is processed in the browser.

Key features

Universal IOL-constant optimisation for any formula with a positional constant
Smart column detection, whatever the spreadsheet layout
Three simultaneous optimisation targets: zero mean error (ME=0), minimal standard deviation (SD-min) and minimal root-mean-square error (RMS-min)
Regression on several biometric parameters and subgroup analysis with comparison
Cumulative numeric filtering to target specific biometric populations
Seven languages, dark mode, responsive design; no installation, no data sent to an external server

IOL exchange power calculator

Tue, 09 Jun 2026 11:58:31 +0000

This tool estimates the power of the replacement IOL when a refractive surprise occurs after cataract surgery. It relies on a non-empirical vergence method, entirely independent of the usual IOL calculation formulas, using only the power of the IOL in place, the manifest refraction, the keratometry (K1/K2) and the cornea-to-IOL distance. For toric IOLs, it performs a full vectorial analysis and computes an optimal rotation angle presented as an alternative to exchange.

Key features

Non-empirical vergence calculation, independent of IOL formulas
Support for toric IOLs with vectorial analysis (J0/J45)
Posterior-cornea compensation (Koch, Abulafia-Koch, Goggin, LaHood)
Comparison between optimal rotation and IOL exchange
Q-ratio method (Gatinel) and sensitivity analysis
Multilingual interface and PDF export for clinical documentation

PEARL-DGS: IOL power calculator

Tue, 09 Jun 2026 11:58:31 +0000

The PEARL-DGS formula, developed by Debellemanière, Gatinel and Saad and published open-source, computes IOL power by combining thick-lens equations with machine-learning models that predict the posterior corneal radius and the effective lens position (TILP). The tool offers three dedicated modules: « Regular Eyes » for standard cataracts (choice of keratometric index, biometer and IOL model), « Complex Eyes » for challenging cases (corneas after myopic or hyperopic LASIK/PRK, radial keratotomy, scarred corneas, eyes carrying an ICL) and « Second Eyes », which refines the second-eye prediction from the first-eye data. Optional parameters (lens thickness LT, central corneal thickness CCT, white-to-white WTW) further improve accuracy when available.

Key features

Machine-learning prediction of the lens position (TILP)
Algorithms suited to corneas after refractive surgery
Options for radial keratotomy and scarred corneas
Specific adjustments for eyes carrying an ICL
Second-eye optimisation from the first-eye data
Open-source methodology and online access (iolsolver.com)

AIOLsci — Personalised IOL performance predictor

olivier — Tue, 09 Jun 2026 11:58:29 +0000

AIOLsci supports IOL selection by objectively estimating the visual outcome expected for a given eye. The tool combines the wavefront of the IOLs, measured on an optical bench, with a personalised aspheric corneal model (radius R, asphericity Q), then computes the through-focus MTF to quantify the real outcome rather than relying on an average eye. Manufacturer-independent and compatible with any biometer or topographer, it makes direct comparison between monofocal, EDOF and multifocal IOLs straightforward.

Key features

Personalised corneal modelling (radius R, asphericity Q)
Through-focus MTF analysis at several spatial frequencies
Library of IOLs characterised by optical-bench measurements (refractive profiles, diffractive elements)
Neutral, manufacturer-independent comparisons
Depth-of-field estimation
Compatible with all biometers and topographers