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       XXVII Annual Congress of the Iranian Society of Ophthalmology        بـیــست و هفتمین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران
مقاله Abstract


Title: Visual function, contrast sensitivity and stereopsis after photorefractive keratectomy for treatment of high astigmatism error
Author(s): Hamid Khakshour, Amirhosein Vejdani, Ladan Saffarian
Presentation Type: Oral
Subject: Cornea and Anterior Segment
Others:
Presenting Author:
Name: Hamid Khakshour
Affiliation :(optional) Eye Research Center, Mashhad University of Medical Sciences
E mail: hkhakshoor@Yahoo.com
Phone: 38418079
Mobile: 09151151208
Purpose:

To evaluate the visual outcomes of photorefractive keratectomy (PRK) for the correction of astigmatism error more than 3.00 diopters (D) and changes in contrast sensitivity measurements and stereopsis.

Methods:

In this prospective study, patients with astigmatism more than 3 D were included. In total, 451 eyes were included after exclusions. All treatments were performed by one surgeon. Outcome measures were postoperative refraction, visual acuity, spatial contrast sensitivity function (using CVS 1000 chart from 3 to 18 cycle/degree) and stereopsis. The Follow up period was up to 12 months. All eyes were targeted for emmetropia.

Results:

The Mean preoperative manifest sphere ranged from 5 to -7 D (Mean: -2.1, standard deviation [SD]: 2.7), and preoperative manifest cylinder ranged from -3.00 to -7 D (Mean: -4.2, SD: 0.92). Mean postoperative spherical equivalent at 12 months postoperatively was -0.4 (SD: 0.44) with significant change (p=0.001). The percentage of eyes achieving uncorrected distance visual acuity 20/20 or better was 88%. There was statistically significant change in contrast sensitivity at 3 and 6 cycle/degree at 12months (p=0.001). Stereopsis test showed no change after operation. No corneal haziness happened.

Conclusion:

In the current study, our results indicate that excimer laser corneal refractive surgery is efficient for correction of high astigmatism error without any serious complication.

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