Topcon ALADDIN HW3.0, User Manual

Page: 66 / 170

ALADDIN
- User manual Rev. 19 EN of 10/07/2019
66
11.14.2 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 topography, the need for
an astigmatic correction, can use 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.
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 45
Figure 45 above shows the SW environment for entering data for the “IOL Calculation”.
In the
“Surgeon” field, you can choose which surgeon will perform the IOL implant and any customization of
the constants or preset of the preferred lenses and formulae will be applied on this basis.