| Induced astigmatism after 4 and 6 mm scleral tunnel incision. A randomized study. | |
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MedLine Citation:
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PMID: 9527329 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To study the surgically induced astigmatism after phacoemulsification through either a 4 or a 6 mm scleral tunnel incision by using multiple analyses of astigmatism. METHODS: 197 eyes from 186 patients scheduled for phacoemulsification between October 1992 and March 1994 were randomly assigned two different-sized incisions with follow-ups at 1 day, 1 week, 2 weeks, 1 month and 4 months after surgery. The surgically induced astigmatism was evaluated using at each follow-up: 1) The subtraction method, 2) vector analysis, 3) vector decomposition, 4) Cravy's vertical vector, 5) Naeser's polar values, and 6) the algebraic method. RESULTS: By subtraction, without regard to axis, the induced astigmatism 4 months after surgery was +0.04 D and +0.18 D in the 4 mm and the 6 mm incision group, respectively. By vector analysis, the numerical value of the induced cylinder was stable one month after surgery at 0.61 D and 0.77 D in the 4 mm and in the 6 mm group, respectively. However, cylinder orientation was not found stable until 4 months after surgery, where 94% and 96% of the surgically induced astigmatism (vector decomposition) was against-the-wound in the two groups, respectively. By Cravy's method, the mean induced astigmatism changed from -0.08 D to -0.32 D and from -0.42 D to -0.60 D between 1 and 4 months in the 4 mm and the 6 mm group, respectively. Similar values were found with Naeser's method and with the algebraic method. CONCLUSION: We conclude the mean cylinder of the surgically induced astigmatism (vector analysis) to be stable 1 month after phacoemulsification with both the 4 mm and 6 mm scleral tunnel incision. However, the direction of the induced axis (vector decomposition) was still drifting between 1 and 4 months in both groups. These astigmatic changes were adequately described using vector analysis and vector decomposition. |
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Authors:
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M Dam-Johansen; T Olsen |
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Publication Detail:
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Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Acta ophthalmologica Scandinavica Volume: 75 ISSN: 1395-3907 ISO Abbreviation: Acta Ophthalmol Scand Publication Date: 1997 Dec |
Date Detail:
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Created Date: 1998-05-08 Completed Date: 1998-05-08 Revised Date: 2008-03-17 |
Medline Journal Info:
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Nlm Unique ID: 9507578 Medline TA: Acta Ophthalmol Scand Country: DENMARK |
Other Details:
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Languages: eng Pagination: 669-74 Citation Subset: IM |
Affiliation:
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Department of Ophthalmology, Arhus University Hospital, Aarhus C, Denmark. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Astigmatism / etiology* Cornea / pathology Female Follow-Up Studies Humans Male Middle Aged Phacoemulsification / adverse effects*, methods Postoperative Complications Refraction, Ocular Retrospective Studies Sclera / surgery* Suture Techniques* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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