Comparison of axial length measurements in silicone oil–filled eyes using SS-OCT and partial coherence interferometry

Zhang, Jiaqing; Han, Xiaotong; Zhang, Miao; Liu, Zhenzhen; Lin, Haowen; Qiu, Xianjian; Huang, Xinhua; Li, Tao; Li, Lin; Chen, Xiaoyun; Jin, Guangming; Tan, Xuhua; Luo, Lixia; Liu, Yizhi

doi:10.1097/j.jcrs.0000000000000996

Cited by 8 publications

(6 citation statements)

References 25 publications

(37 reference statements)

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“…The larger hyperopic error and the correlation between PE and AL in the silicone oil subgroup suggested that there may be systematic errors in the AL measurement of silicone oil-filled eyes with IOL-Master 700, thereby confirming our earlier findings. 28 Scleral buckling surgery alters the ocular structure, resulting in a longer AL and shallower ACD compared with preoperative measurements. [29][30][31] These changes in turn affect the IOL calculation, but the prediction accuracy for such patients remains largely unknown.…”

Section: Discussionmentioning

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%

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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“…In the present study, the AL data we used were obtained from the IOL Master with the status of SO-filled eyes. To address potential overestimation by the IOL Master for the AL in long eyes ( 22 ), our study applied the Wang-Koch adjustment to the AL of patients with an AL of >26 mm. Regarding anterior chamber depth (ACD), it has been reported that the increase in ACD in SO-injected patients after pars plana vitrectomy returns to preoperative values within 1 month of surgery ( 23 ).…”

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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“…Four traditional formulas were also assessed, including Haigis et al (2000) Hoffer (1993, 2007, Holladay et al (1988) and SRK/T (Retzlaff et al, 1990). The formulas were calculated to determine the predicted postoperative spherical equivalent refraction of the implanted IOL power using measured AL and corrected AL with silicone oil adjustment (SO AL = 0.9478 × measured AL +1.1984), (Zhang et al, 2022) respectively. The User Group for Laser Interference Biometry (ULIB) constants were used (available at www.…”

Section: Formula Calculationmentioning

confidence: 99%

Correction of axial length measurement error by IOLMaster 700 could improve refractive prediction accuracy in silicone oil‐filled eyes

Zhang,

Han,

Jin

et al. 2024

Acta Ophthalmologica

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PurposeTo determine whether correcting the axial length (AL) measurement error of the IOLMaster 700 could improve the refractive prediction accuracy in silicone oil‐filled eyes.MethodsThis study included 265 cataract patients (265 eyes) with silicone oil tamponade who were scheduled for phacoemulsification with intraocular lens (IOL) implantation. The performances of various formulas, including Barrett Universal II, Emmetropia Verifying Optical, Hoffer‐QST, Kane, Ladas Super Formula, Pearl‐DGS, Radial Basis Function and traditional formulas (Haigis, Hoffer Q, Holladay 1 and SRK/T), were evaluated. The refractive prediction errors (PE) calculated with measured AL (ALmeas) and corrected AL with silicone oil adjustment (SOAL) were compared. Subgroup analysis was performed based on the ALmeas (<23 mm; 23–26 mm; ≥26 mm).ResultsUsing SOAL significantly reduced the hyperopic PE of formulas when compared to ALmeas (−0.05 to 0.17 D vs 0.15 to 0.38 D, p < 0.001). After applying AL correction, all formulas showed a lower mean absolute PE (0.47–0.57 D vs 0.50–0.69 D). The percentage of eyes within ±1.0 D of PE increased from 84.91%–88.68% to 89.81%–91.32% for new formulas and from 78.11%–83.40% to 85.66%–88.68% for traditional formulas, with the use of SOAL. Subgroup analysis showed that the majority of formulas with SOAL in prediction accuracy for eyes with an AL ≥26 mm (p < 0.05).ConclusionsThe refractive prediction accuracy in silicone oil‐filled eyes was improved by correcting the AL measurement error of the IOLMaster 700, especially for long eyes.

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Comparison of axial length measurements in silicone oil–filled eyes using SS-OCT and partial coherence interferometry

Abstract: The OA2000 is the preferred biometer for axial length measurement in silicone oil–filled eyes. The IOLMaster 500 and IOLMaster 700 overestimate the axial length, and the measurement errors increase with longer axial length.

Cited by 8 publications

References 25 publications

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

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

Intraocular lens power calculation for silicone oil-dependent eyes

Correction of axial length measurement error by IOLMaster 700 could improve refractive prediction accuracy in silicone oil‐filled eyes

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