IOL POWER CALCULATION ON ITS NEXT LEVEL – THE “LPCM” BASED ON MODERN CASTROP FORMULA

The new "Lens Power Calculation Module" (LPCM) for calculation of toric and non-toric intraocular lenses is based on the CASTROP formula and is available as online calculation tool via IOLCon´s website. Hereby, modern online IOL power calculation support is provided for ophthalmic surgeons.

Institute of Experimental Ophthalmology, Saarland University, 66421 Homburg/Saar, Germany

Close cooperation between the Institute of Experimental Ophthalmology, University Homburg/Saar (Germany) and the University Eye Clinic, Bogomolets National Medical University, Kyiv (Ukraine).

The CASTROP vergence formula is based on a pseudophakic model eye with four refractive toric surfaces: a refractive correction at spectacle plane, a thick cornea with front and back surface, and a thin intraocular lens. The IOL position is predicted regressively using real historical measurement data. The prerequisite is the use of current techniques that precisely measure all distances of the eye, like axial length (AL), anterior chamber depth (ACD), lens thickness (LT, mandatory) and the central corneal thickness (CCT, optionally). The formula considers 3 formula constants (C, H, and R) to allow a more flexible adaption of the formula to a specific IOL geometry. With this data (in connection with modern formulae such as the CASTROP formula), even eyes that are outside the norm and which might cause difficulties when using classic formulae, can be calculated more reliably. The “LPCM” is based on the CASTROP formula and provides support in IOL power calculation as online tool. It can be accessed free of charge via www.iolcon.org.

IOLCon offers an online calculation tool based on the most disclosed IOL power calculation formula including the CASTROP formula. The support IOLCon is providing for ophthalmic surgeon is