IOLCon Designed to Map Out the Road for Reliable IOL Calculation
Internet database IOLCon announced updates to its website, www.iolcon.org, which is designed to offer a reliable source for optimized IOL constants and specifications. Based on modern optimization strategies, individually optimized IOL constants are available free of charge for ophthalmic surgeons.
The method used by IOLCon to optimize IOL constants is based on "intelligent IOL constant optimization." Optimizations of the constants for the following published formulas can be found on IOLCon´s website: Haigis, Hoffer-Q, Holladay 1, SRK/T, and now also for the Castrop formula.
The new Castrop formula predicts the position of the IOL regressively using real historical measurement data (based on approximately 2,000 data sets). More information regarding the Castrop formula, which is available also as a toric implementation, was published by two open access articles recently:
- Langenbucher et al, Considerations on the Castrop formula for calculation of intraocular lens power, PLoS One. 2021) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8172026/
- Langenbucher et al, The Castrop formula for calculation of toric intraocular lenses, Graefe's Archive for Clinical and Experimental Ophthalmology, November 2021 (https://www.researchgate.net/publication/353086636_The_Castrop_formula_for_calculation_of_toric_intraocular_lenses )
The prerequisite is the use of current measurement techniques which precisely measure all distances of the eye. With this data in combination with modern formulae (such as the Castrop formula), even eyes that are outside the “norm” can be calculated more reliable compared to using classic formulae.