Early visual outcomes and optical quality after femtosecond laser small-incision lenticule extraction for myopia and myopic astigmatism correction of over −10 dioptres

Objectives: To compare the efficacy of small incision lenticule extraction (SMILE) and toric implantable collamer lens (TICL) implantation for myopic astigmatism correction using vector analysis. Methods: In this retrospective study, 171 eyes of 171 patients with cylinder ⩾1.0 diopters (D) were recruited, with 97 eyes underwent SMILE and 74 eyes underwent TICL implantation. Preoperative and 3-months postoperative visual and refractive results were examined. The astigmatism correction, graded by the degree of preoperative cylinder was compared between two groups using vector analysis. Results: At 3-months postoperatively, the residual cylinder was −0.10 ± 0.21 D in the SMILE group and −0.30 ± 0.32 D in the TCL group ( p < 0.05). Furthermore, 98% and 85% of eyes had the cylinder within ±0.5 D in the SMILE and TICL group, respectively. The vector analysis revealed similar target induced astigmatism vector in two groups. However, the difference vector, magnitude of error, angle of error, and index of success were significantly higher (0.30 ± 0.32 D, −0.19 ± 0.25, −2° ± 4.35°, and 0.16 ± 0.17 D, respectively) in the TICL group than the values in the SMILE group (0.10 ± 0.21 D, −0.05 ± 0.20, −0.03° ± 2.13°, and 0.05 ± 0.12, respectively), regardless of the degree of preoperative cylinder (all p < 0.05). For preoperative cylinder < 2.0 D, surgically induced astigmatism vector and correction index in the SMILE group were higher than those in the TICL group ( p < 0.05). Conclusion: Both SMILE and TICL implantation are effective techniques for myopic astigmatism correction. However, the accuracy of correction in the magnitude and axis of astigmatism with SMILE was better than that achieved with TICL implantation.

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Control-matched comparison of refractive and visual outcomes between small incision lenticule extraction and femtosecond laser-assisted LASIK

Clinical Ophthalmology ◽

10.2147/opth.s161883 ◽

2018 ◽

Vol Volume 12 ◽

pp. 865-873 ◽

Cited By ~ 5

Author(s):

Takahiro Kataoka ◽

Tomoya Nishida ◽

Azusa Murata ◽

Mayuka Ito ◽

Naoki Isogai ◽

...

Keyword(s):

Femtosecond Laser ◽

Small Incision Lenticule Extraction ◽

Visual Outcomes ◽

Small Incision ◽

Lenticule Extraction ◽

Matched Comparison

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Early visual quality outcomes after small-incision lenticule extraction surgery for correcting high myopic astigmatism

10.21203/rs.3.rs-48935/v1 ◽

2020 ◽

Author(s):

Xiangtao Hou ◽

Xiaoying Wu ◽

Kaixuan Du ◽

Dan Wen ◽

Shengfa Hu ◽

...

Keyword(s):

Spherical Aberration ◽

Optical Quality ◽

Small Incision Lenticule Extraction ◽

Quality Outcomes ◽

Vector Method ◽

Small Incision ◽

Lenticule Extraction ◽

Axis Rotation ◽

Myopic Astigmatism ◽

High Myopic Astigmatism

Abstract Background: To evaluate early optical quality outcomes after small-incision lenticule extraction (SMILE) surgery for correcting high myopic astigmatism.Methods: This retrospective study enrolled 55 eyes from 37 patients who had preoperative myopic astigmatism of ≥2.00 diopters (D) who had been treated with SMILE surgery. Preoperatively, the mean cylinder was -2.41 ± 0.54 D (range, -2.00 D to -4.50 D). The preoperative and postoperative visual outcomes, refraction, and higher-order aberration (HOA) at 1 and 3 months were compared. Refractive astigmatism changes were analyzed by the Alpins vector method.Results: Three months after SMILE surgery, the average cylinder was -0.14 ± 0.31 D, and the average astigmatism vector was -0.09 D × 6.34°. The angle of error (AofE) was limited to within ±10°, and the magnitude of error was limited to within ±1.0 D in all patients. The correction index (CI) was 0.98 ± 0.07, the index of success (IOS) was 0.08 ± 0.13, and the flattening index (FI) was 0.97 ± 0.07. Significant positive correlations were found between IOS and |AofE| (P = 0.000); negative correlations were found between FI and |AofE| (P = 0.000). The postoperative total HOA, spherical aberration, vertical coma aberration, and trefoil 30° were increased significantly compared with preoperative measurements, and the increase in HOA was closely related to preoperative astigmatism (P < 0.05).Conclusions: SMILE has preferable outcomes for correcting high myopic astigmatism. Axis rotation during the surgery might influence the undercorrection of astigmatism. The increase of HOA after surgery is related to preoperative astigmatism.

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Early visual quality outcomes after small-incision lenticule extraction surgery for correcting high myopic astigmatism

10.21203/rs.3.rs-48935/v3 ◽

2021 ◽

Author(s):

Xiangtao Hou ◽

Kaixuan Du ◽

Dan Wen ◽

Shengfa Hu ◽

Tu Hu ◽

...

Keyword(s):

Spherical Aberration ◽

Optical Quality ◽

Small Incision Lenticule Extraction ◽

Quality Outcomes ◽

Vector Method ◽

Small Incision ◽

Lenticule Extraction ◽

Axis Rotation ◽

Myopic Astigmatism ◽

High Myopic Astigmatism

Abstract Background: To evaluate early optical quality outcomes after small-incision lenticule extraction (SMILE) surgery for correcting high myopic astigmatism.Methods: This retrospective study enrolled 55 eyes from 37 patients who had preoperative myopic astigmatism of ≥2.00 diopters (D) who had been treated with SMILE surgery. Preoperatively, the mean cylinder was -2.41 ± 0.54 D (range, -2.00 D to -4.50 D). The preoperative and postoperative visual outcomes, refraction, and higher-order aberration (HOA) at 1 and 3 months were compared. Refractive astigmatism changes were analyzed by the Alpins vector method.Results: Three months after SMILE surgery, the average cylinder was -0.14 ± 0.31 D, and the average astigmatism vector was -0.09 D × 6.34°. The angle of error (AofE) was limited to within ±10°, and the magnitude of error was limited to within ±1.0 D in all patients. The correction index (CI) was 0.98 ± 0.07, the index of success (IOS) was 0.08 ± 0.13, and the flattening index (FI) was 0.97 ± 0.07. Significant positive correlations were found between IOS and |AofE| (P = 0.000); negative correlations were found between FI and |AofE| (P = 0.000). The postoperative total HOA, spherical aberration, vertical coma aberration, and trefoil 30° were increased significantly compared with preoperative measurements, and the increase in HOA was closely related to preoperative astigmatism (P < 0.05).Conclusions: SMILE has preferable outcomes for correcting high myopic astigmatism. Axis rotation during the surgery might influence the undercorrection of astigmatism. The increase of HOA after surgery is related to preoperative astigmatism.

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Early visual quality outcomes after small-incision lenticule extraction surgery for correcting high myopic astigmatism

10.21203/rs.3.rs-48935/v2 ◽

2020 ◽

Author(s):

Xiangtao Hou ◽

Dan Wen ◽

Kaixuan Du ◽

Shengfa Hu ◽

Tu Hu ◽

...

Keyword(s):

Spherical Aberration ◽

Optical Quality ◽

Small Incision Lenticule Extraction ◽

Quality Outcomes ◽

Vector Method ◽

Small Incision ◽

Lenticule Extraction ◽

Axis Rotation ◽

Myopic Astigmatism ◽

High Myopic Astigmatism

Abstract Background: To evaluate early optical quality outcomes after small-incision lenticule extraction (SMILE) surgery for correcting high myopic astigmatism.Methods: This retrospective study enrolled 55 eyes from 37 patients who had preoperative myopic astigmatism of ≥2.00 diopters (D) who had been treated with SMILE surgery. Preoperatively, the mean cylinder was -2.41 ± 0.54 D (range, -2.00 D to -4.50 D). The preoperative and postoperative visual outcomes, refraction, and higher-order aberration (HOA) at 1 and 3 months were compared. Refractive astigmatism changes were analyzed by the Alpins vector method.Results: Three months after SMILE surgery, the average cylinder was -0.14 ± 0.31 D, and the average astigmatism vector was -0.09 D × 6.34°. The angle of error (AofE) was limited to within ±10°, and the magnitude of error was limited to within ±1.0 D in all patients. The correction index (CI) was 0.98 ± 0.07, the index of success (IOS) was 0.08 ± 0.13, and the flattening index (FI) was 0.97 ± 0.07. Significant positive correlations were found between IOS and |AofE| (P = 0.000); negative correlations were found between FI and |AofE| (P = 0.000). The postoperative total HOA, spherical aberration, vertical coma aberration, and trefoil 30° were increased significantly compared with preoperative measurements, and the increase in HOA was closely related to preoperative astigmatism (P < 0.05).Conclusions: SMILE has preferable outcomes for correcting high myopic astigmatism. Axis rotation during the surgery might influence the undercorrection of astigmatism. The increase of HOA after surgery is related to preoperative astigmatism.

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