13.12.2 Spherical IOL calculation
The section where you process the data collected for the calculation of the best intraocular lens is divided
into three main parts:
The IOL Calculation section is fundamental in calculating the total spherical power that will compensate the
removal of the crystalline in cataract surgery. This calculation, depending on the case, will be sufficiently
precise to guarantee the patient optimal vision.
In certain cases, however, if the corneal astigmatism exceeds a disturbance value, i.e. if faced with a medium
or medium-high astigmatism, it is advisable to implant an intraocular lens that also takes this factor into
account (refer to the following section).
In the “Toric IOL Calculation” section, a surgeon who has established, by means of a topography, the need
for an astigmatic correction, can confidently use the Oculentis toric lens calculation. The calculation is made
on the basis of the ideal spherical IOL and the patient's characteristics. The software then, on the basis of the
corneal astigmatism, recalculates the one on the IOL plane, also considering the possible astigmatism induced
by surgery.
The Toric IOL is thus chosen, which guarantees post-operation refraction with minimum residual
astigmatism.
Caution: The Toric IOL Calculation function is not available for the US market.
Finally, in the “Post Refractive IOL” section you can calculate the intraocular lenses for patients who have
already had refractive surgery to correct myopia or hypermetropia.
Figure 49
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