FIELD: medicine.
SUBSTANCE: method for calculating optical power of an intraocular lens (IOL) based on a personalized eye simulation using a Raytracing method in Opticstudio by constructing an optical eye model based on the Liou-Brennan model using individual eyeball parameters. First, eyeball parameters are measured: anterior and posterior corneal surface, anterior chamber depth and lens thickness. Further, the estimated depth of the anterior chamber is calculated by formula: ACDpost = ACDpre + ½ of lens thickness – ½ of IOL thickness, where ACDpost is the postoperative anterior chamber depth in mm, ACDpre is the preoperative anterior chamber depth in mm. Data of the anterior and posterior surfaces of the cornea are then converted by interpolation into a three-dimensional model describing the shape of the cornea in each specific case. Further, modulation transfer function (MTF) is plotted using parameters of table values for each tested IOL, calculation of the thickness of the optical part of the intraocular lens in the Compass-3D program, with subsequent calculation by means of a definite integral, the largest area under the MTF graph, corresponding to the optimal value recommended for the optical power IOL implantation.
EFFECT: using the given invention enables increasing the prediction accuracy of the refractive effect in order to obtain the maximum planned functional outcome of the lens replacement surgery regardless of the initial parameters of the eyeball.
1 cl, 8 dwg, 2 ex
