J Korean Ophthalmol Soc > Volume 56(4); 2015 > Article
Journal of the Korean Ophthalmological Society 2015;56(4):499-508.
DOI: https://doi.org/10.3341/jkos.2015.56.4.499    Published online April 15, 2015.
Clinical Results of Intacs(R) Ring Implantation in Keratoconus or Keratectasia.
Ji Ah Kim, Dong Hyun Kim, Won Ryang Wee, Mee Kum Kim
1Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea. Kmk9@snu.ac.kr
2Laboratory of Ocular Regenerative Medicine and Immunology, Seoul Artificial Eye Center, Seoul National University Hospital Clinical Research Institute, Seoul, Korea.
원추각막 및 각막확장증에서 각막링 삽입술의 임상성적 비교분석
서울대학교 의과대학 안과학교실1, 서울대학교병원 의생명연구원 인공안구센터 안면역각막재생연구실2
To report the clinical results after the implantation of intrastromal corneal ring segments (Intacs(R)) for the correction of keratoconus or keratectasia. METHODS: This retrospective study was comprised of 16 eyes treated by insertion of intrastromal corneal ring and 30 eyes treated by penetrating keratoplasty (PKP) who were diagnosed with keratoconus or keratectasia. Visual acuity, refractive outcome, keratometric values were evaluated before and at 3 months, 6 months, and 12 months postoperatively. In addition, the implanted ring segment depth was measured by anterior segment optical coherence tomography and the results were compared based on the depth of the ring. RESULTS: Twelve months after treatment, best corrected visual acuity (BCVA) was log MAR 0.32 at the ring group and log MAR 0.20 at the PKP group. BCVA change was larger at the PKP group than the ring group. Postoperative keratometric value was smaller at the ring group than at the PKP group. 3 mm irregular astigmatism was larger at the ring group than at the PKP group. The shallowly implanted ring group had a larger effect than the deeply implanted ring group. CONCLUSIONS: Intrastromal corneal ring segment implantation appears to be effective in improving the visual acuity and refractive outcome, although it cannot substitute for PKP.
Key Words: Intacs ring;Keratectasia;Keratoconus;Penetrating keratoplasty

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