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ORIGINAL ARTICLE
Year : 2020  |  Volume : 68  |  Issue : 5  |  Page : 755-761

Comparison of single-step transepithelial photorefractive keratectomy and conventional photorefractive keratectomy in low to high myopic eyes


1 Department of Cataract and Refractive Services, Anand Eye Institute, Hyderabad, Telangana, India
2 Department of Glaucoma Services, Anand Eye Institute, Hyderabad, Telangana, India
3 Department of Nutrition, University of North Carolina at Greensboro, Greensboro, North Carolina, USA

Correspondence Address:
Dr. Aruna Kumari Gadde
Anand Eye Institute, Hyderabad - 500 007, Telangana
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijo.IJO_1126_19

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Purpose: To compare the visual outcome, safety, safety index, efficacy, efficacy index and corneal transparency between single-step transepithelial photorefractive keratectomy (t-PRK) and conventional photorefractive keratectomy (PRK) with manual debridement of epithelium in eyes with low to high simple myopia and compound myopic astigmatism. Methods: In this retrospective ,case control study, we analysed and compared the postoperative uncorrected visual acuity(UCVA), postoperative best corrected visual acuity (BCVA) , safety, safety index,efficacy,efficacy index and the corneal transparency between t-PRK and PRK with 6th-generation Amaris excimer 500E laser (Schwind eye-tech-solutions) in 115 eyes of 59 patients. Results: Preoperative Mean Refractive Spherical Equivalent (MRSE) was - 3.88 + 0.23 Diopters(D) and -4.73 + 0.23D in PRK and t-PRK group respectively(p=0.09). In both the groups , none of the eyes lost postoperative BCVA at the end of mean follow-up period of 3.5 months . All the eyes achieved post operative UCVA of 20/40 or better in both the groups. Incidence of trace corneal haze was high in t-PRK group at the end of 3.5 months (P = 0.003). Conclusion: Single-step t-PRK and PRK provide similar results at the end of mean follow-up period of 3.5 months postoperatively with regards to post-operative UCVA, post operative BCVA, safety, safety index, efficacy and efficacy index. There was high incidence of trace haze in t- PRK eyes. Both the procedures are predictable, effective, and safe for correction of low to high myopia.


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