Evaluation of intrastromal corneal ring segments for treatment of keratoconus with a mechanical implantation technique
| Autor: | Zeki Tunc, Firat Helvacioglu, Sadik Sencan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Age-related macular degeneration
blindness low vision prevalence retina Cocultivated epithelium conjunctiva cornea limbal stem cells ocular surface Diabetic macular edema optical coherence tomography sensitivity specificity Central macular thickness neovascular age-related macular degeneration segmentation error spectral-domain optical coherence tomography Intrastromal corneal ring segments keraring keratoconus Ophthalmology RE1-994 |
| Zdroj: | Indian Journal of Ophthalmology, Vol 61, Iss 5, Pp 218-225 (2013) |
| Druh dokumentu: | article |
| ISSN: | 0301-4738 1998-3689 |
| DOI: | 10.4103/0301-4738.109519 |
| Popis: | Purpose: To evaluate the clinical outcomes of intrastromal corneal ring segment (ICRS) implantation in patients with keratoconus using a mechanical implantation technique. Materials and Methods: Thirty eyes of 17 patients with keratoconus were enrolled. ICRSs (Keraring) were implanted after dissection of the tunnel using Tunc′s specially designed dissector under suction. A complete ophthalmic examination was performed, including uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), spherical equivalent, keratometric readings, inferosuperior asymmetry index (ISAI), and ultrasound pachymetry. All 3-, 6-, and 12-month follow-ups were completed, and statistical analysis was performed. Results: The mean preoperative UDVA for all eyes was 1.36 ± 0.64 logMAR. At 12 months, the mean UDVA was 0.51 ± 0.28 logMAR (P = 0.001), and the mean preoperative CDVA was 0.57 ± 0.29 logMAR, which improved to 0.23 ± 0.18 (P = 0.001) at 1 year. There was a significant reduction in spherical equivalent refractive error from -6.42 ± 4.69 diopters (D) preoperatively to -1.26 ± 1.45 D (P = 0.001) at 1 year. In the same period, the mean K-readings improved from 49.38 ± 3.72 D to 44.43 ± 3.13 D (P = 0.001), and the mean ISAI improved from 7.92 ± 3.12 to 4.21 ± 1.96 (P = 0.003). No significant changes in mean central corneal thickness were observed postoperatively. There were no major complications during and or after surgery. Conclusion: ICRS implantation using a unique mechanical dissection technique is a safe and effective treatment for keratoconus. All parameters improved by the 1-year follow-up. |
| Databáze: | Directory of Open Access Journals |
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