scholarly journals Functional Optical Zone and Visual Quality After Small-Incision Lenticule Extraction for High Myopic Astigmatism

2021 ◽  
Author(s):  
Xuan Ding ◽  
Dan Fu ◽  
Lin Wang ◽  
Xingtao Zhou ◽  
Zhiqiang Yu
Keyword(s):  
Visual Quality ◽  
Small Incision Lenticule Extraction ◽  
Small Incision ◽  
Optical Zone ◽  
Lenticule Extraction ◽  
Myopic Astigmatism ◽  
High Myopic Astigmatism

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

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.

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

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.

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

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.

Comparison of Early Visual Quality in Patients using Different Optical Zones Based on Dark Pupil Diameters in Small Incision Lenticule Extraction (SMILE)

2021 ◽  
Author(s):  
Jiao Peng ◽  
Ding-Juan Zhong ◽  
Jia Liu ◽  
Li-Yuan Zhang ◽  
Hao Wu ◽  
...  
Keyword(s):  
Pupil Diameter ◽  
Visual Quality ◽  
Higher Order ◽  
Small Incision Lenticule Extraction ◽  
Small Incision ◽  
Group A ◽  
Optical Zone ◽  
Lenticule Extraction ◽  
The Difference ◽  
Group B

Abstract AIM: The early visual qualities of patients were evaluated after small incision lenticule extraction (SMILE) using different optical zones based on dark pupil diameters.METHODS: A case-control study was conducted to include 49 myopic patients (96 eyes) who underwent SMILE surgery. Patients were divided into three groups according to the difference between the diameter of the optical zone and the diameter of the dark pupil: Group A (<0 mm, N=30), Group B (0-1 mm, N=36), and Group C (>1 mm, N=30). In all groups, the dark pupil diameter was measured preoperatively. Subjective visual quality, uncorrected vision acuity (UCVA), spherical equivalent (SE), modulation transfer function cut-off frequency (MTFcutoff), objective scattering index (OSI), simulated contrast visual acuity (VA100%, VA20%, VA9%), total corneal higher-order aberration (tot-HOA), corneal spherical aberration (totZ40) and corneal coma (tot-coma) were measured preoperatively and 3 months postoperatively. P< 0.05 was considered statistically significant.RESULTS: There were no statistically significant differences in age, sex, UCVA, SE, corneal higher-order aberration, OQAS or subjective visual quality among the three groups before surgery (P>0.05). At 3 months postoperatively, there was no significant difference in UCVA, SE, MTFcutoff, OSI, VA100%, VA20%, or VA9% among the three groups (P>0.05). However, the tot-HOA, totZ40 and tot-coma indexes and the changes in corneal higher-order aberrations (Dtot-HOA, DtotZ40, Dtot-coma) at 3 months postoperatively were as follows: Group A > Group B > Group C (P<0.05). At 3 months postoperatively, the difference in subjective visual quality between the three groups was statistically significant (P<0.05). The difference in the amount of change in subjective visual quality between Groups A and C was statistically significant (P<0.05).CONCLUSION: Although the difference between the diameter of the optical zone and the diameter of the dark pupil does not affect the VA or the same diopter of patients after SMILE myopia correction, the optical zone diameter should be greater than the dark pupil diameter as far as possible in the design of SMILE surgery, in order to improve the objective visual quality and subjective satisfaction of patients after surgery.

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

2021 ◽  
Vol 21 (1) ◽  
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.

Optical and visual quality after small-incision lenticule extraction

2019 ◽  
Vol 45 (1) ◽  
pp. 54-61 ◽  
Author(s):  
Anders Gyldenkerne ◽  
Anders Ivarsen ◽  
Jesper Hjortdal
Keyword(s):  
Visual Quality ◽  
Small Incision Lenticule Extraction ◽  
Small Incision ◽  
Lenticule Extraction

Vector analysis of small incision lenticule extraction and toric implantable collamer lens implantation for astigmatism correction

2020 ◽  
pp. 112067212093060
Author(s):  
Ting Wan ◽  
Houfa Yin ◽  
Zhiyi Wu ◽  
Yabo Yang
Keyword(s):  
Vector Analysis ◽  
Small Incision Lenticule Extraction ◽  
Implantable Collamer Lens ◽  
Small Incision ◽  
Astigmatism Correction ◽  
Induced Astigmatism ◽  
Lenticule Extraction ◽  
The Difference ◽  
Surgically Induced ◽  
Myopic Astigmatism

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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