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Predictability, Stability and Safety of MyoRing Implantation in Keratoconic Eyes During One Year Follow-Up

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2014
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Iranian Society of Ophthalmology
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Purpose: To assess the stability of visual and refractive outcomes that was compared between three and 12 months after MyoRing implantation in moderate and severe keratoconus Methods: This study included 54 eyes of 50 patients (27 males and 23 females) with stage II and III keratoconus who underwent MyoRing (Dioptex GmbH) implantation. Clinical outcomes including uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction, spherical equivalent (SE) and mean keratometry (k)- readings were compared preoperatively and postoperatively (follow-up times were at 1, 3, 6 and 12 months postoperation). Results: The mean age was 28.48±6.3. The mean UDVA (logMAR) and the mean CDVA (logMAR) improved significantly from 1.20±0.24 to 0.20±0.09 and from 0.58±0.22 to 0.14±0.06, respectively (p<0.001). Both SE and the maximum keratometry (k)-reading decreased significantly by six diopters (p<0.001). There was no significant difference in visual and refractive outcomes between three and 12 months postoperatively. Twelve months after MyoRig implantation the predictability was 47 eyes (87%) within ±1.00 D and 31 eyes (57%) within ±0.50 D of emmetropia. Conclusion: MyoRing implantation in keratoconic patients improves SE, UDVA and CDVA significantly. Additionally, the improvement in UDVA was remarkable (approximately 10 lines). The procedure was safe and effective in treatment of patients with moderate and severe keratoconus. The visual and refractive outcomes remained stable between three and 12 months postoperatively.
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Received: September 27, 2014 / Accepted: December 11, 2014
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1. Rabinowitz YS. Keratoconus. Surv Ophthalmol 1998;42(4):279-319. 2. Krachmer JH, Feder RS, Belin MW. Keratoconus and related noninflammatory corneal thinning disorders. Surv Ophthalmol 1984;28(4):293-322. 3. Gordon-Shaag A, Millodot M, Shneor E. The epidemiology and etiology of keratoconus. Int J Keratoco Ectatic Corneal Dis 2012;1(1):7-15. 4. Shimmura S, Tsubota K. Deep anterior lamellar keratoplasty. Curr Opin Ophthalmol 2006;17(4):349-55. 5. Troutman RC, Lawless MA. Penetrating keratoplasty for keratoconus. Cornea 1987;6(4):298-305. 6. Spoerl E, Huhle M, Seiler T. Induction of crosslinks in corneal tissue. Exp Eye Res 1998;66(1):97-103. 7. Siganos D, Ferrara P, Chatzinikolas K, Besssis N, Papastergiou G. Ferrara intrastromal corneal rings for the correction of keratoconus. J Cataract Refract Surg 2002;28(11):1947-51. 8. Colin J, Cochener B, Savary G, Malet F, HolmesHiggin D. INTACS inserts for treating keratoconus; one year results. Ophthalmology 2001;108(8):1409-14. 9. Colin J, Malet FJ. Intacs for the correction of keratoconus: two year follow-up. J Cataract Refract Surg 2007;33(1):69-74. 10. Shabayek MH, Alió JL. Intrastromal corneal ring segment implantation by femtosecond laser for keratoconus correction. Ophthalmology 2007;114(9):1643-52. 11. Alió JL, Shabayek MH. Intracorneal asymmetrical rings for keratoconus: where should the thicker segment be implanted? J Refract Surg 2006;22(3):307-9. 12. Alió JL, Shabayek MH, Artola A. Intracorneal ring segments for keratoconus correction: long-term follow-up. J Cataract Refract Surg 2006;32(6):978-85. 13. Burris TE, Ayer CT, Evensen DA, Davenport JM. Effects of intrastromal corneal ring size and thickness on corneal flattening in human eyes. Refract Corneal Surg 1991;7(1):46-50. 14. Mahmood H, Venkateswaran RS, Daxer A. Implantation of a complete corneal ring in an intrastromal pocket for keratoconus. J Refract Surg 2011;27(1):63-8. 15. Daxer A. Adjustable intracorneal ring in a lamellar pocket for keratoconus. J Refract Surg 2010;26(30:217-21. 16. Daxer A, Mahmoud H, Venkateswaran RS. Intracorneal continuous ring implantation for keratoconus: one-year follow-up. J Cataract Refract Surg 2010;36(8):1296-302. 17. Daxer A. Corneal intrastromal implantation surgery for the treatment of moderate and high myopia. J Cataract Refract Surg 2008;34(2):194-8. 18. Alió JL, Piñero DP, Daxer A. Clinical outcomes after complete ring implantation in corneal ectasia using the femtosecond technology: a pilot study. Ophthalmology 2011;118(7):1282-90. 19. Jabbarvand M, Salamatrad A, Hashemian H, Khodaparast M. Continuous corneal intrasromal ring implantation for treatment of keratoconus in an Iranian population. Am J Ophthalmol 2013;155(5):837-42. 20. Amsler M. [Early diagnosis and microsymptome]. Ophthalmologica 1965;149(5):438-46. 21. Patel S, Marshall J, Fitzke FW, 3rd. Model for deriving the optical performance of the myopic eye corrected with an intracorneal ring. J Refract Surg 1995;11(4):284-52. 22. Daxer A, Fratzl P. Collagen fibril orientation in the human corneal stroma and its implication in keratoconus. Invest Ophthalmol Vis Sci 1997;38(1):121-9. 23. Daxer A, Misof K, Grabner B, Ettl A, Fratzl P. Collagen fibrils in the human corneal stroma: structure and aging. Invest Ophthalmol Vis Sci 1998;39(3):644-8. 24. Fratzl P, Daxer A. Structural transformation of collagen fibrils in corneal stroma during drying. An x-ray scattering study. Biophys J 1993;64(4):1210-4. 25. Koch DD, Kohnen T, Obstbaum SA, Rosen ES. Format for reporting refractive surgical data. J Cataract Refract Surg 1998;24(3):285-7. 26. Shetty R, Kurian M, Anand D, Mhaske P, Narayana KM, Shetty BK. Intacs in advanced keratoconus. Cornea 2008;27(9):1022-9. 27. Güell JL, Morral M, Salinas C, Elies D, Gris O, Manero F. Intrastromal corneal ring segments to correct low myopia in eyes with irregular or abnormal topography including forme fruste keratoconus: 4-year follow-up. J Cataract Refract Surg 2010;36(7):1149-55.
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