Early postoperative changes in corneal densitometry after SMILE with 120-μm and 130-μm cap thickness: a comparative study
Objective: To compare early postoperative changes in corneal densitometry after small incision lenticule extraction using 120-μm and 130-μm cap thicknesses. Methods: 69 eyes of 39 patients who underwent small incision lenticule extraction (SMILE) with cap thicknesses of 120-μm (n = 34) and 130-μm...
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Elsevier
2025-08-01
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| Series: | Advances in Ophthalmology Practice and Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667376225000186 |
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| author | Shirou Wu Hongying Jin Ting Wan |
| author_facet | Shirou Wu Hongying Jin Ting Wan |
| author_sort | Shirou Wu |
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| description | Objective: To compare early postoperative changes in corneal densitometry after small incision lenticule extraction using 120-μm and 130-μm cap thicknesses. Methods: 69 eyes of 39 patients who underwent small incision lenticule extraction (SMILE) with cap thicknesses of 120-μm (n = 34) and 130-μm (n = 35) were included in this study. The corneal densitometry (CD) of three zones (0–2 mm, 2–6 mm, and 6–10 mm) of the anterior, central, and posterior corneal layers was evaluated before, one week, and one month after surgery. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), spherical degree, cylinder degree, and spherical equivalent (SE) were also analyzed and compared between the two groups before and after surgery. Results: Little difference was detected between the two groups in postoperative UCVA, BCVA, SE, and cylinder degree at one month. No statistically significant differences were found between the preoperative and postoperative CD values for the overall (0–12 mm) cornea and the 6–10 mm zone in either group. A significant increase in CD was observed in the 0–2 mm and 2–6 mm zones of the anterior layer in the 120-μm group, and the 0–2 mm zone of the central layer in the 130-μm group, one week postoperatively. These changes persisted for one month after surgery (P < 0.05). The CD in the central layer (0–2 mm and 2–6 mm) in the 120-μm group, as well as the total layer (0–2 mm and 2–6 mm) in both groups, significantly increased at the first postoperative week but returned to preoperative levels by one month after surgery. Additionally, the CD of the anterior layer (0–2 mm and 2–6 mm) increased significantly in the first week postoperatively, decreased significantly one month postoperatively, but remained significantly higher than baseline in the 130-μm group. In both groups, the CD of the posterior 0–2 mm zone decreased. Moreover, the increase in CD in the anterior 2–6 mm zone one week postoperatively was significantly higher in the 120-μm group compared to the 130-μm group (ΔCD 2.4 ± 1.55 vs. 1.64 ± 0.87, P = 0.014). Postoperative corneal wavefront aberrations were significantly higher in the 120-μm group than in the 130-μm group. Conclusions: CD increased mainly in the 0–6 mm zone of the anterior layer in the early phase after the SMILE procedure with both the 120-μm and 130-μm groups. The increase in CD in the anterior 2–6 mm zone one week postoperatively was higher in the 120-μm group than in the 130-μm group. SMILE with 120-μm and 130-μm cap thickness were both efficient and safe, but eyes with a 120-μm cap thickness showed higher postoperative corneal wavefront aberrations. |
| format | Article |
| id | doaj-art-d37c13cc30e247c3a4c2b2890f60e26a |
| institution | Kabale University |
| issn | 2667-3762 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Elsevier |
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| spelling | doaj-art-d37c13cc30e247c3a4c2b2890f60e26a2025-08-24T05:15:02ZengElsevierAdvances in Ophthalmology Practice and Research2667-37622025-08-015319620410.1016/j.aopr.2025.04.003Early postoperative changes in corneal densitometry after SMILE with 120-μm and 130-μm cap thickness: a comparative studyShirou Wu0Hongying Jin1Ting Wan2Eye Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China; Zhejiang Provincial Key Laboratory of Ophthalmology, Zhejiang Provincial Clinical Research Center for Eye Diseases, Zhejiang Provincial Engineering Institute on Eye Diseases, Hangzhou, ChinaEye Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China; Zhejiang Provincial Key Laboratory of Ophthalmology, Zhejiang Provincial Clinical Research Center for Eye Diseases, Zhejiang Provincial Engineering Institute on Eye Diseases, Hangzhou, ChinaEye Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China; Zhejiang Provincial Key Laboratory of Ophthalmology, Zhejiang Provincial Clinical Research Center for Eye Diseases, Zhejiang Provincial Engineering Institute on Eye Diseases, Hangzhou, China; Corresponding author. Eye Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China.Objective: To compare early postoperative changes in corneal densitometry after small incision lenticule extraction using 120-μm and 130-μm cap thicknesses. Methods: 69 eyes of 39 patients who underwent small incision lenticule extraction (SMILE) with cap thicknesses of 120-μm (n = 34) and 130-μm (n = 35) were included in this study. The corneal densitometry (CD) of three zones (0–2 mm, 2–6 mm, and 6–10 mm) of the anterior, central, and posterior corneal layers was evaluated before, one week, and one month after surgery. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), spherical degree, cylinder degree, and spherical equivalent (SE) were also analyzed and compared between the two groups before and after surgery. Results: Little difference was detected between the two groups in postoperative UCVA, BCVA, SE, and cylinder degree at one month. No statistically significant differences were found between the preoperative and postoperative CD values for the overall (0–12 mm) cornea and the 6–10 mm zone in either group. A significant increase in CD was observed in the 0–2 mm and 2–6 mm zones of the anterior layer in the 120-μm group, and the 0–2 mm zone of the central layer in the 130-μm group, one week postoperatively. These changes persisted for one month after surgery (P < 0.05). The CD in the central layer (0–2 mm and 2–6 mm) in the 120-μm group, as well as the total layer (0–2 mm and 2–6 mm) in both groups, significantly increased at the first postoperative week but returned to preoperative levels by one month after surgery. Additionally, the CD of the anterior layer (0–2 mm and 2–6 mm) increased significantly in the first week postoperatively, decreased significantly one month postoperatively, but remained significantly higher than baseline in the 130-μm group. In both groups, the CD of the posterior 0–2 mm zone decreased. Moreover, the increase in CD in the anterior 2–6 mm zone one week postoperatively was significantly higher in the 120-μm group compared to the 130-μm group (ΔCD 2.4 ± 1.55 vs. 1.64 ± 0.87, P = 0.014). Postoperative corneal wavefront aberrations were significantly higher in the 120-μm group than in the 130-μm group. Conclusions: CD increased mainly in the 0–6 mm zone of the anterior layer in the early phase after the SMILE procedure with both the 120-μm and 130-μm groups. The increase in CD in the anterior 2–6 mm zone one week postoperatively was higher in the 120-μm group than in the 130-μm group. SMILE with 120-μm and 130-μm cap thickness were both efficient and safe, but eyes with a 120-μm cap thickness showed higher postoperative corneal wavefront aberrations.http://www.sciencedirect.com/science/article/pii/S2667376225000186SMILECorneal densitometryCap thicknessWavefront aberration |
| spellingShingle | Shirou Wu Hongying Jin Ting Wan Early postoperative changes in corneal densitometry after SMILE with 120-μm and 130-μm cap thickness: a comparative study Advances in Ophthalmology Practice and Research SMILE Corneal densitometry Cap thickness Wavefront aberration |
| title | Early postoperative changes in corneal densitometry after SMILE with 120-μm and 130-μm cap thickness: a comparative study |
| title_full | Early postoperative changes in corneal densitometry after SMILE with 120-μm and 130-μm cap thickness: a comparative study |
| title_fullStr | Early postoperative changes in corneal densitometry after SMILE with 120-μm and 130-μm cap thickness: a comparative study |
| title_full_unstemmed | Early postoperative changes in corneal densitometry after SMILE with 120-μm and 130-μm cap thickness: a comparative study |
| title_short | Early postoperative changes in corneal densitometry after SMILE with 120-μm and 130-μm cap thickness: a comparative study |
| title_sort | early postoperative changes in corneal densitometry after smile with 120 μm and 130 μm cap thickness a comparative study |
| topic | SMILE Corneal densitometry Cap thickness Wavefront aberration |
| url | http://www.sciencedirect.com/science/article/pii/S2667376225000186 |
| work_keys_str_mv | AT shirouwu earlypostoperativechangesincornealdensitometryaftersmilewith120mmand130mmcapthicknessacomparativestudy AT hongyingjin earlypostoperativechangesincornealdensitometryaftersmilewith120mmand130mmcapthicknessacomparativestudy AT tingwan earlypostoperativechangesincornealdensitometryaftersmilewith120mmand130mmcapthicknessacomparativestudy |