To present refractive, visual and topographic outcomes of femtosecond laser assisted intrastromal ring segments (ISRS) implantation.
Settings
Bascom Palmer Eye Institute, Miami, FL, USA.
Materials and methods
Nineteen eyes of 15 patients with keratoconus, clear central corneas, and contact lens intolerance had implantation of a symmetrical 0.45 mm Inta cs segment (Addition Technology Inc, California, USA) using 200 kHz femtosecond laser (WaveLight GmbH, Erlangen, Germany). The outcomes of the procedure were evaluated in terms of uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), average keratometry value (K-value) and spheric equivalent (SE).
Results
Femtosecond laser assisted ISRS implantation could be performed with ease, while no intra- or postoperative complications were encountered. Mean UCVA improved from 0.95 ± 0.39 to 0.66 ± 0.28 logMAR, mean BSCVA improved from 0.46 ± 0.13 to 0.29 ± 0.21 logMAR, mean spherical equivalent considerably reduced from −7.15 ± 4.57 to −4.38 ± 4.07 and K value reduced from 52.39 ± 5.79 to 49.78 ± 6.84 D at the last follow-up.
Conclusion
Using a 200 kHz femtosecond laser is a safe procedure providing optimal refractive, visual and topographic outcomes in our preliminary study.
How to cite this article
Ozulken K, Cabot F, Kankariya VP, Yoo SH. Preliminary Results of Femtosecond Laser Assisted Corneal Ring Segment Implantation for Keratoconus. Int J Kerat Ect Cor Dis 2013;2(2):47-50.
Kalt, keratoconus and contact lens. Optom Vis Sci 1989;66:643-646.
Keratoconus. Surv Ophthalmol 1998;42:297-319.
Corneal higher order aberrations: a method to grade keratoconus. J Refract Surg 2006;22:539-545.
Corneal wavefront aberration measurements to detect keratoconus patients. Con Lens Anterior Eye 2005;28: 57-66.
Analysis of results related to good and bad outcomes of INTACS implantation for keratoconus correction. J Cataract Refract Surg 2006;32:756-761.
Intracorneal asymmetrical rings for keratoconus: where should the thicker segment be implanted? J Refract Surg 2006; 22:307-309.
Intracorneal ring segments for keratoconus correction: long-term follow-up. J Cataract Refract Surg 2006;32:978-985.
The intrastromal corneal ring segments: phase II results for the correction of myopia. Ophthalmology 1997;104:1067-1078.
Intracorneal ring segment implantation in corneas with postlaser in situ keratomileusis keratectasia. Ophthalmology 2009;116:1665-1674.
Refractive and corneal aberrometric changes after intracorneal ring implantation in corneas with pellucid marginal degeneration. Ophthalmology. 2009;116:1656-1664.
Changes in keratoconic corneas after intracorneal ring segment explantation and reimplantation. Ophthalmology. 2004;111:747-751.
One or two INTACS segments for the correction of keratoconus. J Cataract Refract Surg 2005; 31:943-953.
INTACS inserts for treating keratoconus: one-year results. Ophthalmology 2001;108:1409-1414.
INTACS for keratoconus. Ophthalmology 2003;110:1031-1040.
Multicenter European Corneal Correction Assessment Study Group. Oneyear results of European multicenter study of intrastromal corneal ring segments. J Cataract Refract Surg 2001;27:287-296.
Modified intracorneal ring segment implantations (Intacs) for the management of moderate to advanced keratoconus: efficacy and complications. Cornea 2006;25:29-33.
INTACS inserts using the femtosecond laser compared to the mechanical spreader in the treatment of keratoconus. J Refrac Surg 2006;30:74-78.
First clinical results with the femtosecond neodynium-glass laser in refractive surgery. J Refract Surg 2003;19:94-103.
Intacs for keratoconus: comparison of mechanical versus femtolaser channel dissection. Paper presented at: American Academy of Ophthalmology Annual Meeting; October 10-14, 2007; Las Vegas.
Intrastromal corneal ring segment implantation by femtosecond laser for keratoconus correction. Ophthalmology 2007;114:1643-1652.
llner C, Krause J, Klafke M, Donitzky C, Seiler T. Technical Aspects of the WaveLight FS200 femtosecond laser. J Refract Surg 2010;26: 833-840.
Effect of treatment sequence in combined intrastromal corneal rings and corneal collagen crosslinking for keratoconus. J Cataract Refract Surg 2009;35:2084-2091.
