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The effect of static cyclotorsion compensation on refractive and visual outcomes using the Schwind Amaris laser platform for the correction of high astigmatism.
MedLine Citation:
PMID:  21393051     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: To compare the refractive and visual outcomes using the Schwind Amaris excimer laser in patients with high astigmatism (>1D) with and without the static cyclotorsion compensation (SCC) algorithm available with this new laser platform. METHODS: 70 consecutive eyes with ≥1D astigmatism were randomized to treatment with compensation of static cyclotorsion (SCC group- 35 eyes) or not (control group- 35 eyes). A previously validated optimized aspheric ablation algorithm profile was used in every case. All patients underwent LASIK with a microkeratome cut flap. RESULTS: The SCC and control group did not differ preoperatively, in terms of refractive error, magnitude of astigmatism or in terms of cardinal or oblique astigmatism. Following treatment, average deviation from target was SEq +0.16D, SD±0.52D, range -0.98D to +1.71D in the SCC group compared to +0.46D, SD±0.61D, range -0.25D to +2.35D in the control group, which was statistically significant (p<0.05). Following treatment, average astigmatism was 0.24D (SD±0.28D, range -1.01D to 0.00D) in the SCC group compared to 0.46D (SD±0.42D, range -1.80D to 0.00D) in the control group, which was highly statistically significant (p<0.005). There was no statistical difference in the postoperative uncorrected vision when the aspheric algorithm was used although there was a trend to increased number of lines gained in the SCC group. CONCLUSIONS: This study shows that static cyclotorsion is accurately compensated for by the Schwind Amaris laser platform. The compensation of static cyclotorsion in patients with moderate astigmatism produces a significant improvement in refractive and astigmatic outcomes than when not compensated.
Authors:
Ioannis M Aslanides; Georgia Toliou; Sara Padroni; Samuel Arba Mosquera; Sai Kolli
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-8
Journal Detail:
Title:  Contact lens & anterior eye : the journal of the British Contact Lens Association     Volume:  -     ISSN:  1476-5411     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9712714     Medline TA:  Cont Lens Anterior Eye     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.
Affiliation:
Emmetropia Mediterranean Eye Clinic, Electra Building, Eleftherias Square, Heraklion, Crete, GR 71201, Greece.
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