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مقاله
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Abstract
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Title:
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How ocular non-corneal remaining astigmatism influence outcome of photorefractive keratectomy (PRK)
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Author(s):
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Alireza Peyman, MD, Mohamadreza Peyman, MD
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Presentation Type:
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Poster
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Subject:
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Cornea and Anterior Segment
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Others:
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Presenting Author:
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Name:
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Alireza Peyman
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Affiliation :(optional)
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Assistant professor, Isfahan University of Medical Sciences, Isfahan, Iran
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E mail:
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drpeyman@hotmail.com
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Phone:
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03116617302
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Mobile:
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09133271149
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Purpose:
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to determine the effect of non-corneal ocular remaining astigmatism (ORA) after PRK
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Methods:
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71 eyes of 36 subjects enrolled. Patients underwent PRK for treatment of myopia. Subjects evaluated regarding their refractive error, keratometry, and visual acuity before and six month after surgery. Pre and post-op non-corneal astigmatism defined as ORA calculated by vectorial analysis of difference between corneal plane refractive astigmatism and keratometric astigmatism.
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Results:
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Pre-op spherical equivalent was -6.27 +/- 1.48 with 1.16 +/- 1.02 diopters of corneal plane refractive astigmatism and 1.44 +/- 0.47 diopters keratometric astigmatism, post-op values were -0.60 +/- 0.85, 0.56 +/- 0.47, and 1.06 +/- 0.57 respectively. Pre-op and post-op ORA was 0.76 +/- 0.41 and 0.76 +/- 0.46 respectively (p: 0.976) with significant correlation (r: 0.37, p: 0.002). Pre-op ORA correlated to pre-op SE (r: -0.25, p: 0.04). Pre-op ORA had correlation to keratometric difference vector of astigmatic correction (r: 0369, p: 0.002). Post-op ORA correlated to keratometric induced astigmatism (r: 0.334, p: 0.006), keratometric index of success (r: 0.571, p< 0.001), and post-op keratometric astigmatism (r: 0.736, p< 0.001).
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Conclusion:
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PRK do not alter ORA. It seems that PRK effectively adjust keratometric astigmatism to correct total refractive astigmatism as well as ORA.
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Attachment:
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