The Journal of Practical Medicine ›› 2021, Vol. 37 ›› Issue (17): 2247-2251.doi: 10.3969/j.issn.1006⁃5725.2021.17.016

• Clinical Research • Previous Articles     Next Articles

The observation and analyses of higher order aberrations of cornea for corneal topography guided smart pulse technology - transepithelial photorefractive keratectomy with different ablation zone diameter

FENG Yu，ZHAO Qingxin，JIA Xinping   

  1. Department of Ophthalmology，the Central Hospital of Xinxiang City，He′nan Province，Xinxiang 453000，China

  • Online:2021-09-10 Published:2021-09-10

Abstract:

Objective To observe and investigate the effects of different laser cutting optical regions on high order aberrations in the personalized surgery of corneal topography guided Smart pulse Technology ⁃ Transepithelial photorefractive keratectomy. Method A total of 127 cases（203 eyes），treated by Corneal Topography Guided Smart pulse Technology⁃Transepithelial photorefractive keratectomy，According to the myopia degree，the low nearsighted⁃ ness was regarded as group A，and the effective cutting optical zone of 6.3 mm was set as group A6.3，6.7 mm as group A6.7，and 7.0 mm as group A7.0. Group B of moderate myopia was divided into group B6.3，group B6.7 and group B7.0， and high myopia C group was optically divided into C6.3 group，C6.5 group and C6.8 group. The naked visual acuity and high order aberrations of the anterior surface of the cornea were compared before and after 6 months operation. Results （1）The naked eye visual acuity of all patients six months after surgery reached or exceeded the preoperative best corrected visual acuity，and the high order aberrations were significantly higher than those before surgery（P < 0.05）.（2）The comparison of the increased value of total high ⁃order aberration in the moderate ⁃low myopia group showed that the difference between 6.3 group and 6.7 group as well as 7.0 group was statistically significant（P < 0.05）. There was no significant difference between 6.7 group and 7.0 group（P > 0.05）.（3）In the high myopia group，the increased value of the higher order aberration was compared with that of the 6.5 group and the 6.8 group，and the difference was statistically significant（P < 0.05）. There was no significant difference between 6.5 group and 6.8 group （P > 0.05）. Conclusion Corneal Topography Guided Smart pulse Technology ⁃ Transepithelial photorefractive keratectomy can improve postoperative high order aberrations by selecting as large an effective cutting area as possible. 

Key words:

ametropia, excimer laser, ablation zone diameter, corneal wave ? front aberration, smart pulse technology