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First Author: U.Emin RUSSIA
Co Author(s): B. Moukharram B. Guzel Z. Nelly B. Gulli
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To examine the efficacy and safety of corneal ring implantation MyoRing combined with intrastromal corneal collagen crosslinking for keratoconus stage II-III
In 2007, Professor A. Daxer (Austria) proposed correcting high myopia, combined with astigmatism by MyoRing implantation in corneal stroma (CISIS - Corneal Intrastromal Implantation) [3, 5]. In 2008, provides for the use of this technique in keratoconus
Presented the two-year results of implantation of corneal implants MyoRing combined with intrastromal crosslinking with 0.1% solution of riboflavin in 17 patients (20 eyes) with keratoconus II-III stage. Dimensions MyoRing calculated from the nomogram on the basis of refraction, keratometry, and pachymetry keratotopography. Implanted corneal rings diameter waas 5-6 mm and a thickness of 240-320 ?m. After the formation of the corneal pocket conducted saturation of the cornea with 0.1% aqueous solution of riboflavin for 15 minutes. Then ring implanted and UV irradiation was performed for 25 minutes. Preoperative data were as follows: spherical component of refraction from -3.0 to -10.0 D, cylindrical from -1.0 to - 5.0 D, corneal refractive power of the average 51,6 ±2,0 D, the average thickness of the cornea 412 ±23,0 mm at the thinnest point.
Non corrected visual acuity (NCVA) increased from preoperative mean 0,09 ±0,12 to 0,3 ±0,12 at 6 months, 0,4 ±0,16 at 12 months and 0,45 ±0,15 in 2 years period (P <0,05). Refractive power of the cornea decreased from an average of 51,6 ±2,0 D to 44,0 ±2,27 D in the first months after the operation, while remaining stable in the late postoperative period and averaged 45,3 ±2,6 D in 24 months. Spherical refractive component decreased from an average of -5,75 ±1,2 D to -2,3 ±0,9 D, and cylindrical with -3,56 ±0,7 D to -1,8 ±0,8 D, radius of curvature of the cornea increased from 7 , 1 ±0,26 to 7,9 ±0,1 mm.
Implantation of corneal rings MyoRing with simultaneous intrastromal corneal crosslinking can significantly improve visual function (5 times), reduce the refractive power of the cornea by 12% and achieved stabilisation during the study period. Simplicity and reversibility makes it a safe and effective treatment.