Clinical Outcomes of Transepithelial Photorefractive Keratectomy in Hyperopia: Follow-up Study
Narrative Responses:
Purpose
To evaluate quantitative and qualitative visual parameters change after Transepithelial Photorefractive Keratectomy (TransPRK) in pure hyperopic or mixed hyperopic astigmatic eyes.
Methods
Twenty three eyes (13 patients) with pure hyperopia or mixed hyperopic astigmatism were recruited in a prospective study at Bina Eye Hospital, Tehran, Iran, from July 2011 to September 2013. All of the cases underwent TransPRK by same expert refractive surgeon (S.A.M.) using SCHWIND AMARIS 500 laser (SCHWIND eye-tech-solutions GmbH, Kleinostheim, Germany). Follow-up visits were scheduled for 6, 9, 12, 15 and 24 months post-operation. Visual outcomes, contrast sensitivity (mesopic and photopic) and high order aberrations were examined pre-operation and in the follow up visits.
Results
Ten eyes belonged to female and thirteen to male patients. Mean preoperative spherical equivalent, UDVA and CDVA were 1.37 ± 1.8, 0.41 ± 0.19 and 1.01 ± 0.18 respectively and at least 12 months post-operation, they improved to 0 (P=0.04), 1.21 ± 0.06 (P≤0.001) and 1.14 ± 0.03 (P=0.17). Mean follow up time was 429 days. No significant regression was detected by 789 days of follow-up. Photopic and Mesopic contrast sensitivity function showed a trend of improvement (1.5 to 0.8 (P=0.06) and 1.4 to .85 (P=0.08) respectively). No clinically significant changes were detected in high order aberration parameters assessed.
Conclusion
This study shows TransPRK using SCHWIND AMARIS to be an effective procedure in pure hyperopic or mixed hyperopic astigmatic eyes to improve visual acuity, refraction and probably quality of vision while it would not change aberrations clinically significant. The improvements seem to be stable.