Astigmatism Correction Using SMILE

Chow, Sharon S W; Chow, Loraine L. W.; Lee, Chester Z; Chan, Tommy C Y

doi:10.1097/01.apo.0000580140.74826.f5

Cited by 44 publications

(26 citation statements)

References 66 publications

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“…For astigmatism correction, the Visumax software (Carl Zeiss Meditec) adds a transition zone to convert the elliptical lenticule into a circle. However, the lenticule still has an oval posterior surface, which results in a smaller diameter of the cleavage plane along its steep axis that its flat axis [ 20 ]. Hou et al speculated that local curvature changes and wound healing caused by the superior incision location may be related to the asymmetric change in horizontal and vertical orientation [ 9 ].…”

Section: Discussionmentioning

confidence: 99%

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

Xuan

Wang

et al. 2021

Ophthalmol Ther

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Introduction: The aim of this study was to compare the functional optical zone (FOZ) after correction of high myopic astigmatism and low myopic astigmatism by small-incision lenticule extraction (SMILE). Methods: In this prospective study, 30 patients who received SMILE for high myopic astigmatism correction (cylinderical diopters B-2.0D) were enrolled in the high astigmatism group (HA). The control group comprised 40 patients who underwent SMILE for low myopic astigmatism correction (LA; cylinderical diopters C-0.5D). FOZ was delineated as the area outlined by a change of 0.5D relative to the power at the corneal vertex on the total corneal refractive power map. An ellipse-fitting program (MatLab) was used to calculate some parameters of the FOZ. Visual quality evaluations were also conducted, including evaluations of wavefront aberrations, optical quality, and intraocular scattering, and completion of a quality of life questionnaire. All of the right eyes were analyzed in the study.

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Section: Discussionmentioning

confidence: 99%

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

Xuan

Wang

et al. 2021

Ophthalmol Ther

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“…Some studies have shown that there is a slight tendency toward undercorrection when treating astigmatism with SMILE [ 4 , 8 , 19 , 20 ]. Ivarsen and Hjortdal [ 21 ] reported an undercorrection of 13% per diopter of attempted cylinder correction in low astigmatic eyes (< 2.5 D) and 16% per diopter in highly astigmatic eyes (≥2.5 D) after SMILE; they believed that the greater the preoperative astigmatism, the higher the degree of undercorrection.…”

Section: Discussionmentioning

confidence: 99%

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

Hou

Wen

et al. 2021

BMC Ophthalmol

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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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“…As the corneal healing response stabilized at 3 Axis shift was determined from the postoperative to preoperative cylinder axis a Shifts were determined as 0 for eyes with zero residual cylinder magnitude months, the axis of astigmatism mostly reversed, but the overall axis deviation of astigmatism was small. Some studies have shown that there is a slight tendency toward undercorrection when treating astigmatism with SMILE [4,8,19,20]. Ivarsen and Hjortdal [21] reported an undercorrection of 13% per diopter of attempted cylinder correction in low astigmatic eyes (< 2.5 D) and 16% per diopter in highly astigmatic eyes (≥2.5 D) after SMILE; they believed that the greater the preoperative astigmatism, the higher the degree of undercorrection.…”

Section: Discussionmentioning

confidence: 99%

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

Hou

Wen

et al. 2021

Preprint

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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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Astigmatism Correction Using SMILE

Cited by 44 publications

References 66 publications

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

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

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

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

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