# Information

**DISCLAIMER : Physicians are solely responsible for the IOL power choice before cataract surgery. By using the PEARL-DGS Calculator, the user agrees to waive all claims against and hold the authors (Dr Debellemanière, Dr Saad and Dr Gatinel) harmless from any claims arising out of his/her use of this tool. The PEARL-DGS calculator outputs are not intended to serve as surgical instructions.**

If you want to evaluate the formula, do not enter the calculations by hand... we will be happy to perform them for you. Please write at contact@pearldgscalculator.com. We will ask you : the 5 biometric parameters (AL, K, ACD, LT, CCT), the IOL model that was used, and the mean postoperative refraction of the dataset (to adjust the constant). For post-operative surgery eyes, the type of surgery must also be provided.

**Remember that this calculator and the methods that it uses are, by many ways, experimental.** This is especially true for the post-refractive surgery calculations, calculations using the data of the first operated eye, and/or combination of those features. ALWAYS DOUBLE-CHECK YOUR CALCULATIONS USING DIFFERENT FORMULAS.

The PEARL-DGS calculator was developed using the methodology described in the paper "*The PEARL-DGS formula: the development of an open-source machine learning-based thick IOL calculation formula*", by Debellemanière G, Dubois M, Gauvin M, Wallerstein A, Brenner Luis F, Rampat R, Saad A, Gatinel D. Am J Ophthalmol. 2021 May 13:S0002-9394(21)00276-2. doi: 10.1016/j.ajo.2021.05.004.

The source code of the methodology used is available at https://github.com/gdebel/pearldgs_toolbox

**We do not store calculation data.**