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Efficacy of Intacs Intrastromal Corneal Ring Segment Relative to Depth of Insertion Evaluated with Anterior Segment Optical Coherence Tomography

AIM: To evaluate the effect of implantation depth of Intacs microthin prescription inserts (Addition Technology Inc, Fremont, California) on visual and topographic outcomes in patients with post- laser-assisted in situ keratomileusis (LASIK) ectasias. SETTINGS AND DESIGN: Retrospective, observationa...

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Autores principales: Hashemi, Hassan, Yazdani-Abyaneh, Alireza, Beheshtnejad, Amirhushang, Jabbarvand, Mahmood, Kheirkhah, Ahmad, Ghaffary, Seyed Reza
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Medknow Publications & Media Pvt Ltd 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3757634/
https://www.ncbi.nlm.nih.gov/pubmed/24014988
http://dx.doi.org/10.4103/0974-9233.114800
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author Hashemi, Hassan
Yazdani-Abyaneh, Alireza
Beheshtnejad, Amirhushang
Jabbarvand, Mahmood
Kheirkhah, Ahmad
Ghaffary, Seyed Reza
author_facet Hashemi, Hassan
Yazdani-Abyaneh, Alireza
Beheshtnejad, Amirhushang
Jabbarvand, Mahmood
Kheirkhah, Ahmad
Ghaffary, Seyed Reza
author_sort Hashemi, Hassan
collection PubMed
description AIM: To evaluate the effect of implantation depth of Intacs microthin prescription inserts (Addition Technology Inc, Fremont, California) on visual and topographic outcomes in patients with post- laser-assisted in situ keratomileusis (LASIK) ectasias. SETTINGS AND DESIGN: Retrospective, observational case series. MATERIALS AND METHODS: In this case series, 16 eyes of 12 patients were evaluated. All cases were post-LASIK ectasia that had undergone intrastromal corneal ring segment (ICRS) implantation. The planned insertion depth was 70% of stromal thickness using a manual dissector. At least 12 months postoperatively, all eyes underwent Visante (Carl Zeiss Meditec) AS-OCT to determine insertion depth. Cases were categorized into 3 groups based on the measured implantation depth: 40-59% thickness; 60-79% thickness; and ≥80% thickness. Visual, refractive and topographic outcomes were evaluated relative to implantation depth. RESULTS: The lowest improvement in the study parameters ocurred when the implantation depth was ≥80%. In this group, uncorrected visual acuity (UCVA) and best spectacle corrected VA (BSCVA) improved less than 0.5 lines. Manifest refractive spherical equivalent (MRSE) and mean keratometry (Km) change was less than 0.5 diopters (D). The greatest improvements were observed with implantation depth of 60-79% where UCVA and BSCVA increased by 4.5 and 2.5 lines respectively, and MRSE and Km changed by approximately 2.00 D. Less improvement was found when ICRS were implanted between 40-59% of stromal thickness. CONCLUSION: Implantation of ICRS greater than 80% of stromal thickness may have no effect on visual and topographic status.
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spelling pubmed-37576342013-09-06 Efficacy of Intacs Intrastromal Corneal Ring Segment Relative to Depth of Insertion Evaluated with Anterior Segment Optical Coherence Tomography Hashemi, Hassan Yazdani-Abyaneh, Alireza Beheshtnejad, Amirhushang Jabbarvand, Mahmood Kheirkhah, Ahmad Ghaffary, Seyed Reza Middle East Afr J Ophthalmol Original Article AIM: To evaluate the effect of implantation depth of Intacs microthin prescription inserts (Addition Technology Inc, Fremont, California) on visual and topographic outcomes in patients with post- laser-assisted in situ keratomileusis (LASIK) ectasias. SETTINGS AND DESIGN: Retrospective, observational case series. MATERIALS AND METHODS: In this case series, 16 eyes of 12 patients were evaluated. All cases were post-LASIK ectasia that had undergone intrastromal corneal ring segment (ICRS) implantation. The planned insertion depth was 70% of stromal thickness using a manual dissector. At least 12 months postoperatively, all eyes underwent Visante (Carl Zeiss Meditec) AS-OCT to determine insertion depth. Cases were categorized into 3 groups based on the measured implantation depth: 40-59% thickness; 60-79% thickness; and ≥80% thickness. Visual, refractive and topographic outcomes were evaluated relative to implantation depth. RESULTS: The lowest improvement in the study parameters ocurred when the implantation depth was ≥80%. In this group, uncorrected visual acuity (UCVA) and best spectacle corrected VA (BSCVA) improved less than 0.5 lines. Manifest refractive spherical equivalent (MRSE) and mean keratometry (Km) change was less than 0.5 diopters (D). The greatest improvements were observed with implantation depth of 60-79% where UCVA and BSCVA increased by 4.5 and 2.5 lines respectively, and MRSE and Km changed by approximately 2.00 D. Less improvement was found when ICRS were implanted between 40-59% of stromal thickness. CONCLUSION: Implantation of ICRS greater than 80% of stromal thickness may have no effect on visual and topographic status. Medknow Publications & Media Pvt Ltd 2013 /pmc/articles/PMC3757634/ /pubmed/24014988 http://dx.doi.org/10.4103/0974-9233.114800 Text en Copyright: © Middle East African Journal of Ophthalmology http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Hashemi, Hassan
Yazdani-Abyaneh, Alireza
Beheshtnejad, Amirhushang
Jabbarvand, Mahmood
Kheirkhah, Ahmad
Ghaffary, Seyed Reza
Efficacy of Intacs Intrastromal Corneal Ring Segment Relative to Depth of Insertion Evaluated with Anterior Segment Optical Coherence Tomography
title Efficacy of Intacs Intrastromal Corneal Ring Segment Relative to Depth of Insertion Evaluated with Anterior Segment Optical Coherence Tomography
title_full Efficacy of Intacs Intrastromal Corneal Ring Segment Relative to Depth of Insertion Evaluated with Anterior Segment Optical Coherence Tomography
title_fullStr Efficacy of Intacs Intrastromal Corneal Ring Segment Relative to Depth of Insertion Evaluated with Anterior Segment Optical Coherence Tomography
title_full_unstemmed Efficacy of Intacs Intrastromal Corneal Ring Segment Relative to Depth of Insertion Evaluated with Anterior Segment Optical Coherence Tomography
title_short Efficacy of Intacs Intrastromal Corneal Ring Segment Relative to Depth of Insertion Evaluated with Anterior Segment Optical Coherence Tomography
title_sort efficacy of intacs intrastromal corneal ring segment relative to depth of insertion evaluated with anterior segment optical coherence tomography
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3757634/
https://www.ncbi.nlm.nih.gov/pubmed/24014988
http://dx.doi.org/10.4103/0974-9233.114800
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