Astigmatism correction with toric implantable collamer lens in low and high astigmatism groups

Cano-Ortiz, Antonio; Sánchez-Ventosa, Álvaro; Membrillo, A.; Castillo, Rosa; Gomera, Aurora; López-Pérez, María Dolores; Villarrubia, Alberto

doi:10.1177/1120672121999991

Cited by 6 publications

(9 citation statements)

References 25 publications

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“…This is in line with the results described by Cano-Ortiz et al in their recent publication on low power astigmatism correction with TICL lenses. 33 In their article, Cano indicates a mean preop power of −1.50D Cyl, which is in line with our preop data. They obtained a cylinder correction accuracy equivalent to ours (R 2 = 0.942) confirming the stability and predictability of the procedure.…”

Section: Discussionsupporting

confidence: 87%

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Low Diopter Phakic Implantable Collamer Lens: Refractive and Visual Outcomes in Low Myopia and Myopic Astigmatism

Alonso-Juárez¹,

Velázquez-Villoria²

2022

OPTH

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Purpose Nowadays the Implantable Collamer Lens (ICL – STAAR Surgical. Monrovia. CA) is a refractive surgical technique offered not only when laser corneal correction is not possible but also when the patient requires premium quality indexes and when dry eye is a concern. The use of ICL phakic lenses in low myopic patients is an emanate factor to study and analyze in order to determine treatment predictability and stability in such patients. In this paper, we conducted a 1-year follow-up study on patients with myopia below −3.5D implanted with ICL lenses. Methods This was a retrospective analytical study that includes patients with phakic ICL implantation from 2 independent clinics with a minimum follow-up of 12 months. Visual acuity, refractive outcomes, vault, and intraocular pressure (IOP) were assessed at 1, 6 and 12 months. Results Eighty-two eyes from 82 patients were included in this analysis. Mean spherical equivalent was −2.34 ± 0.82 (Range −5.50 to −1.00 D). Mean spherical implanted ICL power was −3.04 ± 0.78 D. In 25 eyes (30.5%) a Toric-ICL (TICL) was implanted with a mean TICL cylinder power of +1.64±0.64. Efficacy and security index remained stable for 12 months at 1.07 and 1.09, respectively. Mean vault at 12 months was 513.78 ± 262.87 μm and IOP was 15.63 ± 2.17 mmHg. Conclusion Phakic Implantable Collamer Lens implantation in very low myopia is a predictable, stable, safe, and effective technique with high efficacy and security indexes. Low diopter Toric ICL is also an excellent option for refractive surgery in cases of low diopter astigmatism.

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Section: Discussionsupporting

confidence: 87%

“…At one month, mean vault was 573. 33 Mean IOP did not suffer significant changes in the follow-up, and the difference between preop IOP and IOP after 12 months did not show statistical significance (p = 0.587).…”

Section: Resultsmentioning

confidence: 83%

Low Diopter Phakic Implantable Collamer Lens: Refractive and Visual Outcomes in Low Myopia and Myopic Astigmatism

Alonso-Juárez¹,

Velázquez-Villoria²

2022

OPTH

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“… 42 , 43 In patients with astigmatism, toric ICLs yielded promising results in correcting astigmatic component and were even more effective in eyes with high astigmatism (≥2 D and ≤4 D) than in those with low astigmatism (≥0.75 D and <2 D). 44 , 45 In a review of data from 1905 eyes by Packer in 2018, the weighted average efficacy index was 1.04 (range, 0.90–1.35) and weighted average postoperative uncorrected distance visual acuity (UDVA) was 20/19 (logMAR −0.02) (range, 20/12–20/27 (logMAR −0.20 to 0.14)), confirming the good refractive outcomes of the ICL. 46 In a recent US-FDA clinical trial evaluating 629 eyes of 327 participants, EVO ICL lenses achieved high levels of UDVA (−0.059 ± 0.10 logMAR), with an efficacy index of 1.06.…”

Section: Resultsmentioning

confidence: 99%

“…42 However, compared with patients with high astigmatism (≥2 D and ≤4 D), patients with low astigmatism (≥0.75 D and <2 D) showed slightly lower SE and percentage of eyes having cylinder rotation within 5°. 44 The literature published between October 2018 and October 2022 reporting predictability of refractive correction expressed as percentages within 0.5 D and 1.0 D of target is summarized in Table 2. The pooled data of over 3000 eyes are also shown in the table.…”

Section: Refractive Predictabilitymentioning

confidence: 99%

Intraocular Implantable Collamer Lens with a Central Hole Implantation: Safety, Efficacy, and Patient Outcomes

Wannapanich¹,

Kasetsuwan²,

Reinprayoon³

2023

OPTH

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This review summarizes the available literature and provides updates on the efficacy, safety, and patient outcomes of phakic intraocular lens implantation using implantable collamer lens (ICL), with a focus on newer models with a central port (EVO/EVO+ Visian Implantable Collamer Lens, STAAR Surgical Inc.). All studies included in this review were identified from the PubMed database and were reviewed for relevancy of their topic. Data on hole-ICL implantation performed between October 2018 and October 2022 in 3399 eyes showed a weighted average efficacy index of 1.03 and a weighted average safety index of 1.19 within an average follow-up of 24.7 months. The incidence of complications such as elevated intraocular pressure, cataract, and corneal endothelial cell loss was low. Moreover, both quality of vision and quality of life improved after ICL implantation, confirming the benefits of this procedure. In conclusion, ICL implantation is a promising refractive surgery alternative to laser vision correction with excellent efficacy, safety, and patient outcomes.

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“…Previous studies have found that higher vault tends to have hyperopia and lower vault tends to have myopia [ 14 – 16 ]. Others have also reported that postoperative refractive outcome after ICL implantation depends on preoperative refraction [ 17 – 19 ]. Therefore, the more accurate lens power step may help improve the accuracy of refractive correction.…”

Section: Introductionmentioning

confidence: 99%

Artificial intelligence-based refractive error prediction and EVO-implantable collamer lens power calculation for myopia correction

et al. 2023

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Background Implantable collamer lens (ICL) has been widely accepted for its excellent visual outcomes for myopia correction. It is a new challenge in phakic IOL power calculation, especially for those with low and moderate myopia. This study aimed to establish a novel stacking machine learning (ML) model for predicting postoperative refraction errors and calculating EVO-ICL lens power. Methods We enrolled 2767 eyes of 1678 patients (age: 27.5 ± 6.33 years, 18–54 years) who underwent non-toric (NT)-ICL or toric-ICL (TICL) implantation during 2014 to 2021. The postoperative spherical equivalent (SE) and sphere were predicted using stacking ML models [support vector regression (SVR), LASSO, random forest, and XGBoost] and training based on ocular dimensional parameters from NT-ICL and TICL cases, respectively. The accuracy of the stacking ML models was compared with that of the modified vergence formula (MVF) based on the mean absolute error (MAE), median absolute error (MedAE), and percentages of eyes within ± 0.25, ± 0.50, and ± 0.75 diopters (D) and Bland-Altman analyses. In addition, the recommended spheric lens power was calculated with 0.25 D intervals and targeting emmetropia. Results After NT-ICL implantation, the random forest model demonstrated the lowest MAE (0.339 D) for predicting SE. Contrarily, the SVR model showed the lowest MAE (0.386 D) for predicting the sphere. After TICL implantation, the XGBoost model showed the lowest MAE for predicting both SE (0.325 D) and sphere (0.308 D). Compared with MVF, ML models had numerically lower values of standard deviation, MAE, and MedAE and comparable percentages of eyes within ± 0.25 D, ± 0.50 D, and ± 0.75 D prediction errors. The difference between MVF and ML models was larger in eyes with low-to-moderate myopia (preoperative SE > − 6.00 D). Our final optimal stacking ML models showed strong agreement between the predictive values of MVF by Bland-Altman plots. Conclusion With various ocular dimensional parameters, ML models demonstrate comparable accuracy than existing MVF models and potential advantages in low-to-moderate myopia, and thus provide a novel nomogram for postoperative refractive error prediction and lens power calculation.

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Astigmatism correction with toric implantable collamer lens in low and high astigmatism groups

Cited by 6 publications

References 25 publications

Low Diopter Phakic Implantable Collamer Lens: Refractive and Visual Outcomes in Low Myopia and Myopic Astigmatism

Low Diopter Phakic Implantable Collamer Lens: Refractive and Visual Outcomes in Low Myopia and Myopic Astigmatism

Intraocular Implantable Collamer Lens with a Central Hole Implantation: Safety, Efficacy, and Patient Outcomes

Artificial intelligence-based refractive error prediction and EVO-implantable collamer lens power calculation for myopia correction

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