Figure 1.
Interpolated corneal elevation data.
Tridimensional corneal representation. Corneal elevation data generated from topography was re-formatted and imported to Zemax®. Afterwards, a full definition of the surface shape was obtained through a bicubic spline interpolation of the imported data, thus allowing for ray-tracing. xx and yy axis represent value distribution of the grid over a corneal surface of 10 mm, zz axis represents elevation values.
Figure 2.
Overview of the developed Personalized Pseudophakic Model.
With the schematically represented algorithm, an individual pseudophakic model was obtained for each of the 104 assessed eyes, both before and after refractive surgery. Individual ray-tracing was then performed to allow IOL power calculation.
Figure 3.
Linear fit between anterior corneal radii calculated by Zemax® and evaluated by keratometry.
Regression parameters y (σ = 0.084) = 0.948 (σ = 0.045)x+0.516 (σ = 0.347). Pearson correlation parameters: r = 0.949, p<0.001.
Table 1.
Analysis of parameters calculated by our model and chosen comparators.
Figure 4.
Linear fit between ACDpost estimation using our model and the Olsen 2 formula.
Regression parameters y (σ = 0.164) = 0.657 (σ = 0.069)x+2.014 (σ = 0.335). Pearson correlation parameters: r = 0.688, p<0.001.
Figure 5.
Linear fit between pre-operative IOL power estimation using our model and using the SRK-T formula.
All values were rounded to 0.5 dioptres, in order to reflect currently available IOL powers. Regression parameters y (σ = 0.745) = 0.959 (σ = 0.026)x+0.409 (σ = 0.446). Pearson correlation parameters: r = 0.966, p<0.001.
Figure 6.
Linear fit between post-LASIK IOL using our model and the average of currently used formulas.
All values were rounded to 0.5 dioptres, in order to reflect currently available IOL powers. Regression parameters y (σ = 1.048) = 0.788 (σ = 0.063)x+4.340 (σ = 1.381). Pearson correlation parameters: r = 0.778, p<0.001.