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مقاله
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Abstract
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Title:
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Changes in stereopsis after photorefractive keratectomy
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Author(s):
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Mahmoud Jabbarvand, Mehdi Khodaparast, Hesam Hashemian
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Presentation Type:
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Oral
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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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Mehdi Khodaparast
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Affiliation :(optional)
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Farabi eye Hospital, Tehran University of Medical Sciences
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E mail:
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khodaparastzavareh@yahoo.com
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Phone:
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Mobile:
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09122767664
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Purpose:
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To evaluate the effects of photorefractive keratectomy (PRK) on the stereopsis of myopic and hyperopic patients.
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Methods:
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This study included patients having PRK to achieve emmetropia. The patients were divided into the following 3 groups: low myopia (<-6.0 diopters [D]), high myopia (>-6.0 D), and hyperopia (<+4.0 D). Near stereoacuity was measured using the Randot test under photopic conditions (with corrective glasses) at 40 cm preoperatively (with corrective glasses) and 1, 3, and 12 months postoperatively. Repeated-measure analysis of variance was used to assess changes in stereopsis over time in the 3 groups.
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Results:
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Each group comprised 60 patients. The mean preoperative stereoacuity was 121.16 seconds of arc (arcsec) ± 149.92 (SD), improving to 83.66 ± 75.84 arcsec 1 month postoperatively and 80.66 ± 64.31 arcsec at 3 months (both P < .001). It remained unchanged (83.33 ± 75.01 arcsec) at 12 months (P = .610). Patients with high myopia had the greatest improvement in stereopsis after PRK compared with low myopic and hyperopic patients (P < .001). The improvement in stereoacuity was significantly higher in the severe anisometropic group; the lowest improvement was in the group without anisometropia.
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Conclusion:
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Photorefractive keratectomy could result in an improvement in stereopsis. Patients with high myopia benefitted most from PRK in terms of improvement in stereopsis.
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Attachment:
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