Influence of intraocular astigmatism on the correction of myopic astigmatism by femtosecond laser small-incision lenticule extraction

Qian, Yishan; Huang, Jia; Chu, Ren-yuan; Zhao, Jing; Li, Meiyan; Zhou, Xingtao; Olszewski, Emily; Wang, Yutung

doi:10.1016/j.jcrs.2014.09.036

Cited by 24 publications

(15 citation statements)

References 24 publications

(32 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A recent study evaluated the influence of the ORA on the correction of astigmatism in SMILE, demonstrating that a higher ORA would lead to a higher postoperative manifest astigmatism. 44 Similar results on ORA were also reported in LASIK astigmatism correction. 45–47 These findings stress the importance in the consideration of ORA before performing SMILE rather than just taking into account the astigmatism by anterior corneal curvature.…”

Section: Factors Affecting Astigmatism Correction Using Smilesupporting

confidence: 77%

Astigmatism Correction Using SMILE

Chow

Lee

et al. 2019

Asia-Pacific Journal of Ophthalmology

View full text Add to dashboard Cite

Small incision lenticule extraction (SMILE) was introduced in the recent decade for the treatment of myopia and myopic astigmatism. This flap-free technique has a high efficacy and safety profile and also carries potential advantages over laser in situ keratomileusis such as a better corneal biomechanical stability, reduction in dry eyes rate, and the avoidance of flap complications. However, there have been concerns regarding the precision of astigmatism correction that undercorrection has been reported to be apparent. Various factors that affect astigmatism correction have been identified in the literature. The purpose of this review is to discuss the factors that affect astigmatism correction in SMILE and several techniques to improve the refractive outcomes.

show abstract

Section: Factors Affecting Astigmatism Correction Using Smilesupporting

confidence: 77%

Astigmatism Correction Using SMILE

Chow

Lee

et al. 2019

Asia-Pacific Journal of Ophthalmology

View full text Add to dashboard Cite

show abstract

“…The efficacy of astigmatic correction was compared between the low-and high-ORA groups in this study, and no significant differences were found in refractive SIA, corneal SIA, CI, or IOS. In our previous study on the influence of ORA on the correction of myopic astigmatism by SMILE 6 months postoperatively, there was a significant difference in mean IOS between the two groups (high-ORA: 0.77; low-ORA: 0.46) (4). In another study focused on LASEK, we found the mean IOS to be 0.88 and 0.32 in the high-and low-ORA groups, respectively, 3 months postoperatively (P = 0.04) (6).…”

Section: Discussionmentioning

confidence: 84%

“…For eyes in which ORA is the main RA component, laser ablation might induce new astigmatism on the cornea, which is supposed to increase anterior corneal astigmatism to compensate for internal astigmatism. Our team (4)(5)(6) has demonstrated that ORA influences the efficacy of LASIK, LASEK, and SMILE in correcting myopic astigmatism when refractive correction is confined to the anterior cornea. Roszkowska (7) evaluated the efficacy, safety, stability, and predictability of PRK in correcting myopic astigmatism, hyperopic astigmatism, and mixed astigmatism, and demonstrated that PRK achieved satisfactory correction of all types of astigmatism with moderate and high cylinder magnitudes after 3 years of follow-up.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ocular Residual Astigmatism and Target-Induced Astigmatism on the Efficacy of the Implantation of a Toric Implantable Collamer Lens With Central Hole for Myopic Astigmatism Correction

Zhao

Zhao²,

Yang³

et al. 2022

Front. Med.

Self Cite

View full text Add to dashboard Cite

PurposeTo investigate the effects of ocular residual astigmatism (ORA) and target-induced astigmatism (TIA) on the efficacy of toric implantable collamer lens (TICL) with central hole for myopic astigmatism correction.MethodsRetrospective case series. One hundred and eighteen eyes implanted with a TICL (V4c) from 118 patients were included. Subjective refraction and corneal topography were examined preoperatively, at 1 and 12 months postoperatively. The eyes were divided into the low-ORA ( ≤ 0.5 D) and high-ORA (>0.5 D) groups based on vector analysis, and into the low-TIA (≥0.75D and <2 D) and the high-TIA (≥2 D and ≤ 4 D) groups according to preoperative refractive astigmatism. Correction index (CI) and index of success (IOS) were compared between different groups.ResultsAll surgeries were uneventful, and no complications occurred during follow-up. At 1 and 12 months postoperatively, no significant differences were found in CI or IOS values between the high and low ORA groups, while significantly higher CI and lower IOS were detected in the high-TIA group than in the low-TIA group (P < 0.05). No significant difference was found in CI between 1 and 12 months postoperatively in either group (P > 0.05). However, significantly lower IOS was found at 12 months compared with 1 month postoperatively for each group (P < 0.05).ConclusionsToric implantable collamer lens (TICL) implantation is effective in correcting myopic astigmatism and is more effective in eyes with high TIA, while ORA has a minor effect.

show abstract

“…Moreover, a recent study yielded comparable results between SMILE and LASIK when treating over 3.0 D of astigmatism without the use of the manual corneal marking method during SMILE [18]. Besides, there are other factors that may influence astigmatic correction by SMILE, including ocular residual astigmatism, angle kappa, anterior corneal curvature, preoperative axis of astigmatism, and the technique of lenticule extraction [12,[19][20][21][22]. Several adjustments of current treatment nomograms have been suggested, leading to a 10% increment in the magnitude of astigmatism correction [4,23].…”

Section: Discussionmentioning

confidence: 96%

Two-year outcomes after full-thickness astigmatic keratotomy combined with small-incision lenticule extraction for high astigmatism

Kim

Chung

2021

BMC Ophthalmol

View full text Add to dashboard Cite

Background To evaluate clinical outcomes after full-thickness astigmatic keratotomy (FTAK) combined with small-incision lenticule extraction (SMILE) in eyes with high astigmatism. Methods This study comprised 75 eyes of 43 patients with over 4.0 diopters (D) of astigmatism who were treated with SMILE after FTAK. Visual acuities and refractive measurements were evaluated at 1 month after FTAK, and 1, 6, 12, and 24 months after SMILE. Vector analysis of the astigmatic changes was performed using the Alpins method. Results Twenty-four months after the combined procedure, the average spherical equivalent was reduced from − 6.56 ± 2.38 D to − 0.36 ± 0.42 D (p < 0.001). The uncorrected and corrected distance visual acuities improved from 1.54 ± 5.53 to − 0.02 ± 0.09 and from − 0.03 ± 0.07 D to − 0.07 ± 0.08 D (both p < 0.001), respectively. The preoperative mean astigmatism was − 5.48 ± 1.17 D, which was reduced to − 2.27 ± 0.97 D and − 0.34 ± 0.26 D at 1 month after FTAK and 24 months after SMILE, respectively (p < 0.001). The surgically-induced astigmatism after FTAK, SMILE, and FTAK and SMILE combined was 3.38 ± 1.18 D, 2.22 ± 0.84 D, and 5.39 ± 1.20 D, respectively. Furthermore, the correction index of FTAK, SMILE, and FTAK and SMILE combined was 0.63 ± 0.17, 0.90 ± 0.40, and 0.98 ± 0.06, respectively. There were no intraoperative or postoperative complications. Conclusion Our surgical procedure combining FTAK and SMILE showed good and stable clinical outcomes during two-year follow-up for the treatment of high astigmatism.

show abstract

Influence of intraocular astigmatism on the correction of myopic astigmatism by femtosecond laser small-incision lenticule extraction

Abstract: Small-incision lenticule extraction was effective in correcting astigmatism but may be less effective in correcting ORA.

Cited by 24 publications

References 24 publications

Astigmatism Correction Using SMILE

Astigmatism Correction Using SMILE

Influence of Ocular Residual Astigmatism and Target-Induced Astigmatism on the Efficacy of the Implantation of a Toric Implantable Collamer Lens With Central Hole for Myopic Astigmatism Correction

Two-year outcomes after full-thickness astigmatic keratotomy combined with small-incision lenticule extraction for high astigmatism

Contact Info

Product

Resources

About