With increasingly sophisticated systems, lenses can now be realigned more accurately. Professor Paolo Vinciguerra, head of the Ophthalmology at the Humanitas Clinical Institute, spoke about this issue. Robotization also plays an important role in the alignment of optics. Since the cornea is a lens, if it is not perfectly aligned with the multifocal lens, visual performance is compromised, same as if we were wearing a spectacle that was not perfectly centered.
What are the required tests before the operation?
The examinations that take place in the pre-operative period are used to fix calculation systems that will allow the projection an image inside the retina during surgery, superimposed on the patient’s eye.
In this way, you can create references to align the axis of astigmatism and the lens center. If you misalign the astigmatism lens by only 10 degrees, which on one eye corresponds more or less to a millimeter, you would lose about 30% of the correction. If the lens is misaligned by 30 degrees or 2-3 millimeters, the correction of astigmatism would be completely nullified.
In addition, if the multifocal lens were to be moved 1 or 1.5 millimeters from the center, a displacement on a 3 cm eye would result in almost complete loss of the multifocal lens function.
Therefore, it is essential to have a system that guides the intervention and allows a quality of action aimed at ensuring patient satisfaction. All this must be accompanied by a low probability of a repeated treatment for a new lens alignment.