13.12.3 Toric IOL calculation
Toric IOL calculation is divided into two main steps. The first one consists on the calculation of the Spherical
Equivalent Power; in the second one you can select the toric IOL that produce the best correction.
Caution: The Toric IOL Calculation function is not available for the US market.
Figure 50
Figure shows the first-step interface that has quite the same structure as the normal IOL calculation. The
available toric lenses you can select come from a list of models whose calculation constants have been
published by their manufacturer. The user can in case insert new toric manufacturers and/or models inside
toric IOL settings section (see 13.15.4.3).
In addition to choosing the “Target”, you need to specify also the “Surgical Induced Astigmatism (SIA)” and
“Incision Location (IL)”. The former identify the astigmatism (in diopters) induced by the incision while the
latter identify the surgical incision axis. After having selected the toric IOL model and one of the available
formulas, a values table from which to choose the Spherical Equivalent Power is obtained. Once you choose
a lens, pressing “Next” at the bottom right, you enter in the second-step of toric IOL calculation (Figure 48).
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