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Clinical Outcomes of Transepithelial Photorefractive Keratectomy According to Epithelial Thickness
Jun, Ikhyun,Kang, David Sung Yong,Arba-Mosquera, Samuel,Kim, Eung Kweon,Seo, Kyoung Yul,Kim, Tae-im SLACK INCORPORATED 2018 Journal of refractive surgery Vol.34 No.8
<P>CONCLUSIONS: Transepithelial PRK is an effective and safe treatment modality regardless of epithelial thickness, However, a difference in postoperative refraction is present between the two groups, and astigmatic correction may be less in patients with thick epithelium; hence, a new algorithm is needed that can be tailored in accordance with individual epithelial thickness.</P>
Kang, David Sung Yong,Lee, Hun,Reinstein, Dan Z.,Roberts, Cynthia J.,Arba-Mosquera, Samuel,Archer, Timothy J.,Kim, Eung Kweon,Seo, Kyoung Yul,Kim, Tae-im SLACK, Inc. 2018 Journal of refractive surgery Vol.34 No.7
<P>CONCLUSIONS: SMILE with the triple marking centration method can yield improved treatment centration and smaller induction of total HOAs, coma, and spherical aberrations.</P>
Lee, Hun,Yong Kang, David Sung,Reinstein, Dan Z.,Arba-Mosquera, Samuel,Kim, Eung Kweon,Seo, Kyoung Yul,Kim, Tae-im Elsevier 2018 Journal of cataract and refractive surgery Vol.44 No.6
<P><B>Purpose</B></P> <P>To evaluate the changes in corneal higher-order aberrations (HOAs) after corneal wavefront-guided transepithelial photorefractive keratectomy (PRK) and small-incision lenticule extraction (SMILE).</P> <P><B>Setting</B></P> <P>Yonsei University College of Medicine and Eyereum Eye Clinic, South Korea.</P> <P><B>Design</B></P> <P>Retrospective case series.</P> <P><B>Methods</B></P> <P>Medical records of patients having either corneal wavefront-guided transepithelial PRK or small-incision lenticule extraction were examined. The root-mean-square total HOAs, 3rd-order coma aberration, and 4th-order spherical aberration were measured preoperatively and 6 months postoperatively. Independent <I>t</I> tests and analysis of covariance were used to compare changes in corneal HOAs between the 2 groups.</P> <P><B>Results</B></P> <P>The study comprised 77 eyes having corneal wavefront-guided transepithelial PRK and 81 eyes having small-incision lenticule extraction. The total HOAs and spherical aberration increased after transepithelial PRK (all <I>P</I> < .001), whereas coma aberration was stable after transepithelial PRK. The total HOAs, spherical aberration, and coma aberration increased after small-incision lenticule extraction (<I>P</I> < .001 for total HOAs, spherical aberration; <I>P</I> = .004 for coma). At 6 months postoperatively, total HOAs and spherical aberration were significantly larger in the transepithelial PRK group than in the small-incision lenticule extraction group. Coma aberration was larger in the small-incision lenticule extraction group than in the transepithelial PRK group. Spherical aberration induction was significantly smaller in the small-incision lenticule extraction group than in the transepithelial PRK group (<I>P</I> < .001), and coma aberration induction was larger in the small-incision lenticule extraction group than in the transepithelial PRK group (<I>P</I> = .011).</P> <P><B>Conclusions</B></P> <P>Small-incision lenticule extraction demonstrated that the induction of total HOAs was comparable to corneal wavefront-guided transepithelial PRK, accompanied by smaller spherical aberration induction and larger coma aberration induction. During small-incision lenticule extraction, surgeons should aim to obtain optimum centration for smaller induction of corneal HOAs.</P>