Visual Outcomes of Photorefractive Keratectomy Retreatment; a Case Series Study

Document Type : Original Article

Authors

1 Department of Optometry, School of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran

2 Ophthalmologist, Tehran University of Medical Sciences, Tehran, Iran

Abstract

Purpose:
Refractive surgery complications can include refractive errors undercorrection and regression. Based on the studies, undercorrection and regression are the most common complications after refractive surgery. The aim of this study is to determine the refractive and visual results in patients with PRK retreatment.
Methods:
In this case series study, a total of 30 eyes of 20 patients were studied. The parameters evaluated were visual acuity and refraction. The mean patient’s age were 34.5±5.9 years. The original treatments and subsequent retreatment were performed by the same surgeon at Farabi Eye Hospital. SPSS 20 statistical software was used to analyze the data. At first, the normality of the data distribution has been tested by Kolmogorov-Smirnov test. Subsequently, The Paired-Samples T Test and Wilcoxon signed-rank test have been used to compare the means of variables.
Results:
The spherical and astigmatism refractions prior to PRK retreatment were -0.80 ± 0.67 diopters (D) and -0.70 ± 0.36 diopters (D) respectively, and after PRK retreatment were change to -0.16 ± 0.69 diopters (D) and -0.49 ± 0.61 diopters (D) respectively. The Logarithm of MAR uncorrected distance visual acuity (UCVA) and best corrected distance visual acuity (BCVA) prior to PRK retreatment were 0.28367 ± 0.25104, 0.01667 ± 0.06064 respectively and after PRK retreatment were 0.08167 ± 0.241148, 0.04467 ± 0.237149 Log MAR.
Conclusion:
PRK retreatment can significantly improve UCVA and decrease residual refractive errors without significant complications. PRK is a useful, safe and effective method for retreatment residual refractive errors.

Keywords

Main Subjects

References

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Journal of Paramedical Sciences & Rehabilitation
Volume 7, Issue 1
February 2018
Pages 7-13

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