Intraocular Lens Calculation Using 8 Formulas in Silicone Oil–Filled Eyes Undergoing Silicone Oil Removal and Phacoemulsification After Retinal Detachment

Lwowski, Christoph; Miraka, Klajdi; Müller, Michael; Singh, Pankaj; Koch, Frank; Kohnen, Thomas

doi:10.1016/j.ajo.2022.07.007

Cited by 11 publications

(6 citation statements)

References 28 publications

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“…Given the fact that vitretomized eyes had a worse visual acuity than patients with normal cataract, eyes with a CDVA of less than 20/40 were not excluded from the study to evaluate the refractive prediction accuracy in a real-world setting, similar to previous studies in this population. 4,[7][8][9] Moreover, due to the retrospective nature of the study, certain surgical details were not available, particularly those related to the details of the scleral buckling procedure. Further research is needed to evaluate the effect of different scleral buckling procedures on predictive accuracy.…”

Section: Discussionmentioning

confidence: 99%

“…Lwowski et al reported that the BUII formula had the smallest MedAE (0.43 D) and the highest percentage within ± 0.50 D of PE (57.8%) in patients undergoing combined silicone oil removal and cataract surgery. 8 We observed a similar performance of the BUII formula (MedAE = 0.42 D, percentage of eyes within ± 0.50 D of PE = 58.87%), while the Kane formula showed a better prediction accuracy in this study (MedAE = 0.36 D, percentage of eyes within ± 0.50 D of PE = 63.77%; Supplemental Table 1, available at http://links.lww.com/JRS/A935). Notably, the Hoffer-QST had the highest FPI in this subgroup, whereas the Kane formula showed a lower absolute PE and a higher percentage of eyes across all ranges of PE.…”

Section: Discussionmentioning

confidence: 99%

“…Studies have shown that new IOL formulas, which incorporate artificial intelligence and additional biometric variables, exhibit superior performance compared with traditional formulas in vitrectomized eyes. 3,4,[7][8][9] However, the optimal formula varies between studies, possibly due to relatively small sample sizes (61 to 211 eyes), patient heterogeneity, and the use of different ranking criteria. The performances of IOL calculation formulas in vitrectomized eyes different in vitreous tamponade, history of scleral buckling, and biometric characteristics are not yet fully understood.…”

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confidence: 99%

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Choice of intraocular lens calculation formula for cataract patients with prior pars plana vitrectomy

Zhang,

Han,

Chen

et al. 2023

J Cataract Refract Surg

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Purpose: To determine the optimal intraocular lens (IOL) calculation formula for vitrectomized eyes with diverse surgical and biometric characteristics. Setting: Zhongshan Ophthalmic Center, Sun Yat-sen University, China. Design: Retrospective consecutive case-series study. Methods: This study included 974 vitrectomized eyes (974 patients) scheduled for phacoemulsification with IOL implantation. Eleven formulas were evaluated: Barrett Universal II(BUII), Emmetropia Verifying Optical, Hoffer-QST, Kane, Ladas Super Formula, Pearl-DGS, Radial Basis Function (RBF), Haigis, HofferQ, Holladay1, and SRK/T. Risk factors for prediction error (PE) exceeding 1D were determined using multiple logistic regression. Subgroup analyses were performed based on surgical history and biometric parameters. Results: The risk of hyperopic PE (>1D) was higher in patients with silicone oil tamponade (odds ratio [OR], 1.82) and longer axial length (AL) (OR, 1.55), while patients with previous scleral buckling (OR, 2.43) or ciliary sulcus IOL implantation (OR, 6.65) were more susceptible to myopic PE (<-1D). The Kane formula had the highest overall prediction accuracy, and also the best in silicone oil-filled eyes and the flat cornea subgroup. The BUII and RBF displayed the optimal performance in eyes with previous scleral buckle and steep cornea, respectively. In eyes with an AL ≥ 26mm, the Holladay1 with the nonlinear version of the Wang-Koch AL adjustment (Holladay1-WKn) showed the lowest absolute PE and highest percentage within ± 1.0D of PE. Conclusions: The Kane achieved the highest overall prediction accuracy in vitrectomized eyes. The optimal formula for eyes with previous scleral buckle, steep cornea, or long AL was BUII, RBF, and Holladay1-WKn, respectively.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Choice of intraocular lens calculation formula for cataract patients with prior pars plana vitrectomy

Zhang,

Han,

Chen

et al. 2023

J Cataract Refract Surg

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“…The IOL power calculation for SO-filled eyes has always posed a challenge for ophthalmologists ( 25 ). Even when employing optical biometry and correct calculation formulas, only a third of SO-filled eyes might achieve ±1.0 D of the target refraction after SO removal ( 26 ).…”

Section: Discussionmentioning

confidence: 99%

“…First, our study predicted the IOL power using data measured before IOL implantation, although some issues may arise during surgery, such as the effects of the surgical incision and changes in the position of the IOL due to viscoelastic agent residue or laxity of the capsular bag. Second, the state and amount of SO may also impact our calculation ( 25 ). However, these issues cannot be predicted; therefore, the influence of these factors is neglected in the derivation of the theoretical formula.…”

Section: Discussionmentioning

confidence: 99%

Intraocular lens power calculation for silicone oil-dependent eyes

Wang,

Yang

et al. 2023

Front. Med.

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BackgroundSilicone oil tamponade is widely used in vitreoretinal surgery. In some cases, silicone oil may not be extracted for a long time or even permanently and is referred to as silicone oil-dependent eyes. In this study, we aimed to deduce a theoretical formula for calculating intraocular lens power for silicone oil-dependent eyes and compare it with clinical findings.MethodsA theoretical formula was deduced using strict geometric optical principles and the Gullstrand simplified eye model. The preoperative and postoperative refractive statuses of patients with silicone oil-dependent eyes who underwent intraocular lens implantation were studied (Group A, n = 13). To further test our derived theoretical formula, patients with silicone oil tamponade and first-stage intraocular lens implantation were included (Group B, n = 19). In total, 32 patients (32 eyes) were included in the study.ResultsIn group A, the calculated intraocular lens power based on our formula was 24.96 ± 3.29 diopters (D), and the actual refraction of the patients was 24.02 ± 4.14D. In group B, the theoretical intraocular lens power was 23.10 ± 3.08D, and the clinical intraocular lens power was 22.84 ± 3.42D. There was no significant difference between the theoretical and clinical refractive powers, and the intraclass correlation coefficient was 0.771 for group A and 0.811 for group B (both p ≤ 0.001). The mean absolute error for silicone oil-dependent eyes of the formula was 1.66 ± 2.09D. After excluding data for two patients with a flat cornea (corneal refractive power < 42D), the mean absolute error decreased to 0.83 ± 0.62D.ConclusionA strong correlation between the theoretical and clinical intraocular lens powers was observed, and the formula we deduced can be used to calculate the intraocular lens power for silicone oil-dependent eyes. This formula will help clinicians select a more appropriate intraocular lens for patients with silicone oil-dependent eyes, especially when the corneal refractive power is ≥42D.

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