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Title:
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Stereopsis after Photorefractive Keratectomy
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Author(s):
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Mahmoud Jabbarvand, Hesam Hashemian, Pasha Anvari, and Mehdi Khodaparast
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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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Pasha Anvari
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Affiliation :(optional)
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Tehran University of Medical Sciences, Farabi Eye Hospital
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E mail:
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panvari@student.tums.ac.ir
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Phone:
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88010558
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Mobile:
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09122490767
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Purpose:
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To evaluate the effect of photorefractive keratectomy (PRK) on stereoacuity of myopic and hyperopic eyes.
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Methods:
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This prospective observational cohort study included 180 patients undergoing PRK, aiming for emmetropia. Stereoacuity (SA) was measured under photopic conditions (85 cd/m2) at near (nSA) and far (fSA), preoperatively (with corrective glasses on) and one month, three months and one year postoperatively. A repeated-measure ANOVA test was used to assess changes of stereopsis over time in three groups of patients (myopia> 6D, myopia < 6D, and hyperopia < 4D).
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Results:
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The study included 60 patients with low myopia < 6D, 60 patients with high myopia > 6D, and 60 patients with hyperopia < 4D. Mean preoperative nSA was 121.16 ± 149.92 sec arc, which improved to 83.66 ± 75.84 sec arc (P<0.001) one month and 80.66 ± 64.31 sec arc three months postoperatively (P<0.001), and stayed unchanged 83.33 ± 75.01 sec arc one year after (P=0.610). fSA improved significantly 3 months after surgery and remained unchanged afterward. Patients with high myopia (>6) showed greatest improvement in near stereopsis following PRK, compared with those with low myopia and hyperopia (P<0.001).
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Conclusion:
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Stereopsis improved following PRK. Patients with high myopia may benefit most from PRK in terms of improvement in stereopsis.
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Attachment:
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5860.pptx
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