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ORIGINAL ARTICLE
Year : 2016  |  Volume : 109  |  Issue : 4  |  Page : 167-171

Assessment of posterior corneal surface changes after photorefractive keratectomy in moderate myopia


Lecturer of Ophthalmology, October 6 University, Giza, Egypt

Correspondence Address:
Tamer H El-Sersy
11 Montaza St., Cairo, 11311
Egypt
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2090-0686.204728

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Aim The aim of this work was to study the changes that occur in the posterior corneal surface after photorefractive keratectomy (PRK) in moderate myopia using pentacam. Patients and methods This prospective study included 30 myopic eyes of 17 patients with spherical equivalent −2.00–6.00 D who underwent PRK using Visx S4 Excimer Laser. Pentacam examination was carried out for all our eyes at preoperatively, and 1 week and 3 months postoperatively. Pentacam was used to compare preoperative and postoperative measurements of the anterior and posterior corneal curvatures, and asphericity of the posterior corneal surface. Results This study included 30 myopic eyes of 17 patients, seven women and 10 men. Patients’ ages ranged from 28 to 40 years; the mean age was 30.3±3.03 years. No statistically significant changes were found in the posterior horizontal corneal curvature. A statistically significant change in the posterior vertical corneal curvature from 6.1±0.3 to 6.06±0.2 mm 1 week after PRK was found, but it increased after 3 months to 6.2±0.3 mm. No statistically significant changes in the posterior mean corneal curvature were observed either at 1 week or 3 months after PRK. A significant change in the Q-value (asphericity) was found both at 1 week and 3 months postoperatively. Conclusion After PRK, changes in the posterior corneal surface affect mainly the vertical curvature asphericity with forward elevation of the posterior corneal surface.


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