Figure 12 shows how the surgeon can use astigmatism to his or her advantage.
In this case, I was able to align the resultant astigmatism to be in the axis of a corneal scar. Using the VISX laser in Corneoplastique mode can clear the corneal scar and correct the astigmatism to emmetropia. Flipping the axis using a toric IOL can be used to correct the cornea with the “inside-out” technique.
The topographic results at the bottom of the slide show the results in patients who have had correction of a corneal scar and irregular astigmatism to a measurable, regular refractive astigmatism endpoint, which then was corrected during cataract surgery with implantation of a toric IOL to achieve emmetropia.