Original articleContinuous Corneal Intrastromal Ring Implantation for Treatment of Keratoconus in an Iranian Population
Section snippets
Methods
The present study was an interventional case series. All procedures were performed by 2 surgeons (M.J. and A.S.) in 2010, with identical surgical techniques. All patients gave informed consent to participate in research and to undergo the proposed treatment, after explanation of other options of treatment. The tenets of the Helsinki Declaration were followed, and the Institutional Review Board of Tehran University approved both the procedures and use of the MyoRing for keratoconic patients
Results
The mean preoperative sphere was −4.6 ± 4.36 D (range, −16.00 to 2.00 D), mean cylinder was −5.3 ± 2.17 D (range, −2.00 to −11.00 D), and mean spherical equivalent was −7.28 ± 4.69 D. Also, the mean keratometry reading was 51.77 ± 3.65 D (range, 48 to 59 D).
Preoperative and postoperative measurements are shown in Table 2. Before surgery, 58% eyes had a UDVA of 20/200 or worse, whereas after 12 months, 42% eyes had a UDVA of 20/40 or better. No significant change in central corneal thickness was
Discussion
The concept of continuous ring implantation into an intrastromal pocket was proposed first in 2008.10 Its safety and efficacy for myopia correction and keratoconus have been shown and proved in many prior studies.6, 10, 11 In the present study, we demonstrated a reduction in corneal power and astigmatism after MyoRing placement. The reduction in the mean corneal keratometry (9.78 D) and spherical power (5.74 D) was more significant than the cylindrical power reduction (3.02 D; Figure 1).
Mahmoud Jabbarvand, MD, is Professor and Chairman of the Department of Ophthalmology, Tehran University of Medical Sciences (TUMS), Iran. He received his cornea fellowship from TUMS in 1997 and joined the faculty at the Department of Ophthalmology of TUMS. His main areas of research interests are corneal diseases, esp. refractive surgery and keratoconus. Dr Jabbarvand has published extensively in his research fields, with over 50 publications in peer reviewed journals.
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Cited by (41)
Femtosecond laser implantation of a 340-degree intrastromal corneal ring segment in keratoconus: Short-term outcomes
2017, Journal of Cataract and Refractive SurgeryConfocal biomicroscopic changes of the corneal layers following femtosecond laser-assisted MyoRing implantation in keratoconus
2017, Journal of Current OphthalmologyCitation Excerpt :Our study demonstrated additional information, including improved uncorrected visual acuity and spherical equivalent 6 months after the operation, about effectivity of the procedure. The improvement in the uncorrected visual acuity and spherical equivalent after the procedure was similar to other studies.5–9 Thus, the femtolaser-assisted MyoRing implantation might be an effective procedure to treat patients with keratoconus.
MyoRing treatment of myopia
2017, Journal of OptometryCitation Excerpt :The presented data therefore describe the visual results which can be achieved by that method if the patients are properly selected according to the criteria described above. In agreement with the experience with the treatment of keratoconus, no intra- or postoperative complications have been observed in the treatment of myopia.8–11 In conclusion, MyoRing treatment is a safe, effective and fully reversible refractive surgery procedure which gives excellent results in a particular group of myopic patients suffering from moderate and high myopia.
Long-term results of MyoRing treatment of keratoconus
2017, Journal of OptometryEfficacy of MyoRing implantation in the treatment of keratoconus
2024, International Eye ScienceClinical Outcomes of Femtosecond Laser-assisted Implantation of 325-Degree Versus 340-Degree Arc Length Intracorneal Ring Segments in Naive Keratoconic Eyes
2023, Journal of Ophthalmic and Vision Research
Mahmoud Jabbarvand, MD, is Professor and Chairman of the Department of Ophthalmology, Tehran University of Medical Sciences (TUMS), Iran. He received his cornea fellowship from TUMS in 1997 and joined the faculty at the Department of Ophthalmology of TUMS. His main areas of research interests are corneal diseases, esp. refractive surgery and keratoconus. Dr Jabbarvand has published extensively in his research fields, with over 50 publications in peer reviewed journals.
Hesam Hashemian, MD, received his medical degree and internship in Tehran University of Medical Sciences (TUMS), Iran, followed by a residency at Farabi Eye Hospital at 2010. He is now an Assistant Professor at the Department of Ophthalmology, TUMS. His main areas of research interests are corneal diseases, cataract and refractive surgery, and keratoconus. Dr Hashemian has published 10 publications in peer reviewed journals, and edited one international book.
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