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[Multiple factors analysis of myopic regression after photorefractive keratectomy]
1Ophthalmiclaser Center, Xiangya Hospital, Hunan Medical University, Changsha 410008, China.
Purpose:
To investigate myopic regression after excimer laser photorefractive keratectomy(PRK) in patients with myopia.
Methods:
PRK was performed to correct myopia errors from 1.00 D to 16.00 D diopters on 214 myopia eyes(121 patients). All eyes were divided into two groups: group I--1.00 D(-)-6.00 D (124 eyes), group II--6.25 D(-)-16.00 D(90 eyes). All the patients were followed up for two years.
Results:
A Significant positive correlation was found between the regression and the extents of attempted correction. The rate of regression in mild to moderate myopia group was 9.7% while in highter group it was 27.8% (P < 0.005). The rate of regression of older age group in lighter myopia group was highter than that in younger case (P < 0.005). Relatively severe haze under the corneal epithelium often accompanies the regression.
Conclusion:
The main factors which caused the myopia regression after PRK was the extent of attempted correction, patients' age and corneal haze.