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L. Mosca, R. Fasciani, L. Mosca, L. Guccione, M. I. Giannico, A. Siniscalco, M. Riso, E. Balestrazzi; Femtosecond Laser Assisted INTACS Inserts to Correct Irregular Astigmatism in Keratoconus Patients. Invest. Ophthalmol. Vis. Sci. 2009;50(13):3544.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the effectiveness of INTACS intrastromal inserts to correct irregular astigmatism in stable keratoconic eyes.
: 7 eyes of 6 patients, (5M, 1F; mean age: 41yrs +/- 13SD), affected by keratoconus with high irregular astigmatism were submitted to INTACS asymmetric implant assisted by 60 kHz femtosecond laser (IntraLase, AMO, Irvine, CA, USA). Mean topographic cylinder was 4.40D +/- 1.05SD; mean refractive error in spherical equivalent (SE) was -1.07 +/- 2.25SD; mean refractive cylinder was 3.11D +/- 3.23SD. Mean preoperative Surface Asymmetry Index (SAI) was 8.25 +/- 2.19SD. Mean preoperative UCVA was 0.31 +/- 0.17SD; mean preoperative BCVA was 0.80 +/-0.22SD.
Three months after surgery, mean topographic astigmatism was 3.05D +/- 1.31SD; mean refractive error in SE was -0.66D +/- 1.97SD; mean refractive error was -1.43D +/- 2.48SD. These results showed a correction of 30% of the preoperative topographic cylinder and of 55% of the preoperative refractive cylinder. Mean postoperative SAI was 7.19 +/- 1.97SD. This outcome shows a slight regularization of corneal keratoconic surface. Mean postoperative UCVA was 0.49 +/- 0.18SD and mean postoperative BCVA was 0.86 +/- 0.14SD.
On the base of these preliminary results, asymmetric femtosecond laser assisted INTACS inserts seems to be a valid and safe surgical choice to correct irregular astigmatism (slight reduction of SAI in all patients) of stable keratoconic eyes.
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