Buffering zone of implantable Collamer lens sizing in V4c

Nam, Seung; Lim, Dong Hui; Hyun, Joo Seok; Chung, Eun Kyoung; Chung, Tae‐Young

doi:10.1186/s12886-017-0663-4

Cited by 33 publications

(21 citation statements)

References 24 publications

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“…ICL size was selected as the explanatory variable using multiple regression analysis; however, the single correlation analysis showed no significant correlation with postoperative ACV. This result was consistent with a previous report [13], describing no correlation between ICL size and ACV. It is speculated that ACV may be affected by complex factors, including angle, anterior chamber structure, and ICL size.…”

Section: Discussionsupporting

confidence: 94%

Prediction of anterior chamber volume after implantation of posterior chamber phakic intraocular lens

et al. 2020

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Purpose To predict the anterior chamber volume (ACV) after implantable collamer lens (ICL) implantation based on ICL size and parameters of anterior segment optical coherence tomography (AS-OCT). Design Retrospective study. Methods This study included 222 eyes of 222 patients who underwent ICL implantation at Nagoya Eye Clinic. The patients were divided into two groups: prediction group, for creating the prediction equation (148 eyes, mean age: 32.11 ± 8.04 years), and verification group, for verifying the equation (74 eyes, mean age: 33.03 ± 6.74 years). The angle opening distance (AOD), anterior chamber width (ACW), ACV, anterior chamber depth, lens vault, angle-to-angle distance, angle recess area, and trabecular iris space area were calculated using AS-OCT. A stepwise multiple regression analysis was performed. After the creation of the prediction equation, its accuracy was verified in the verification group. Results The ACV, AOD750, ACW, and ICL size were selected as explanatory variables to predict postoperative ACV. Mean predicted (114.2 ± 21.83 mm3) and actual postoperative ACVs (116.1 ± 25.41 mm3) were not significantly different (P = 0.269); absolute error was 10.59 ± 9.13 mm3. In addition, there was high correlation between actual and predictive ACV (adjusted R2 = 0.6996, p < 0.0001). Bland-Altman plot revealed that there was no addition or proportional error between predicted and actual postoperative ACV. Conclusion Postoperative ACV was accurately predicted using AS-OCT parameters and ICL size. This prediction equation may be useful for making decisions regarding ICL size.

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Section: Discussionsupporting

confidence: 94%

Prediction of anterior chamber volume after implantation of posterior chamber phakic intraocular lens

et al. 2020

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“…This previous study included 39 eyes of 39 patients that had undergone implantation with wide range of V4c ICL overall diameters (12.1-mm, 12.6-mm, 13.2-mm, or 13.7-mm) [ 21 ]. In recent study identifying factors associated with the unexpected vaulting in eyes that had undergone implantation of V4c ICL, authors concluded that smaller sized ICL should be considered in patients with shallow ACD [ 22 ]. Postoperative vaulting was also associated with preoperative ACD, WTW, and horizontal and vertical STS in eyes that had undergone implantation of a V4 or V4c ICL [ 16 ].…”

Section: Discussionmentioning

confidence: 99%

Analysis of pre-operative factors affecting range of optimal vaulting after implantation of 12.6-mm V4c implantable collamer lens in myopic eyes

Lee

Kang²,

Choi³

et al. 2018

BMC Ophthalmol

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BackgroundTo evaluate clinical factors affecting postoperative vaulting in eyes that had achieved optimal vaulting within the range of 250–750 μm following implantation of 12.6-mm V4c implantable collamer lenses (ICL).MethodsA total of 236 eyes of 236 patients that had achieved optimal vaulting following implantation of a 12.6-mm V4c ICL were retrospectively analyzed. Associations between postoperative vaulting and age, preoperative anterior chamber depth (ACD), preoperative axial length (AL), preoperative white-to-white diameter, preoperative pupil size, preoperative sulcus-to-sulcus diameter, and preoperative manifest refraction spherical equivalent were investigated using simple regression, stepwise multiple regression, and multinomial logistic regression analyses.ResultsMean central vaulting at the 6-month follow-up was 519.0 ± 112.8 μm. Variables relevant to postoperative vaulting were, in order of influence, preoperative ACD (β = 0.305, p < 0.001), preoperative pupil size (β = 0.218, p < 0.001), and preoperative AL (β = 0.171, p = 0.006). Low preoperative pupil size was associated with low optimal vaulting (250 to 450 μm), relative to that observed in the mid optimal vaulting group (451 to 550 μm) (odds ratio = 0.532, P = 0.021). Increasing preoperative ACD was associated with high optimal vaulting (551 and 750 μm), relative to that observed the mid optimal vaulting group (odds ratio = 6.340, P = 0.034).ConclusionsMyopic eyes with greater preoperative ACD, larger pupil size, and longer AL are predisposed to higher postoperative vaulting following 12.6-mm V4c ICL implantation. Therefore, the extremes of these parameters should be considered when choosing V4c ICL size.

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“…Previous studies have reported a relation among ocular size, vault degree and ICL size. While eyes with a deep anterior chamber and/or a high W-W have higher vaults with a bigger lens size (this case tends to oversize the ICL), eyes with a shallow anterior chamber and/or low W-W have lower vaults with a smaller lens size (undersizes the ICL) 29,30 . Similarly, the current results suggest that ∆vault depends on some ocular parameters.…”

Section: Discussionmentioning

confidence: 99%

Vault changes after cyclopentolate instillation in eyes with posterior chamber phakic intraocular lens

Gargallo-Martínez

García-Medina

Rubio-Velázquez

et al. 2020

Sci Rep

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posterior chamber phakic intraocular lens (pioL) implantation is a common option for correcting moderate-to-high ocular refractive defects. Because this pIOL is implanted on ciliary sulcus, the distance between the back surface of the pIOL and the anterior surface of the crystalline lens, that it is known as vault, should be measured in different conditions to ensure the technique's safety. Cyclopentolate is a drug that dilates the pupil and relaxes accommodation (cycloplegia). It is often used for different ocular examinations and for other medical purposes. However, there is no evidence of the effect of this drug on vault. This study quantified central vault changes associated with cyclopentolate instillation. We measured the vault under normal conditions (pre-cycloplegic instillation) and after instilling cyclopentolate on 39 eyes of 39 patients with implanted pIOL. Our results suggest that cyclopentolate instillation may induce changes to vault in eyes with implanted pIOL. These changes seem safe and are mainly associated with vault under normal conditions, but also with anterior chamber depth, pupillary diameter and pIOL size. Visian Implantable Collamer Lens (ICL, STAAR Surgical) is a foldable posterior chamber phakic intraocular lens (pIOL) designed to correct moderate-to-high myopia 1. The latest models have a central hole that allows better aqueous humour exchange between the anterior and posterior chambers without the need for iridotomy 2. These models present safe and efficacious results as previous models with no hole 3,4. The central vault is defined as the distance between the back surface of the ICL and the anterior surface of the crystalline lens. An appropriate vault has been suggested to be between 250 and 750 µm 5. An insufficient vault may induce anterior subcapsular cataract due to the contact between the ICL and the anterior lens capsule 1,6,7. Excessive vaulting can cause angle closure, pupillary blockage or pigmentary dispersion syndrome, which can increase intraocular pressure and, thus, the risk of glaucoma 8-11. Therefore, it is important to measure this distance to ensure the technique's safety. Changes in anterior segment structures appear during accommodation, such as reduced anterior chamber depth (ACD), inducing proximity between the anterior surface of the crystalline lens and the cornea with appearance of synkinetic myosis 12. The ICL is implanted in the ciliary sulcus. Given its location, dynamic interactions take place between the pIOL and the surrounding structures. Some authors have studied these effects on the vault by accommodative stimulus 13-17 , instillation of pilocarpine for pharmacologically-induced accommodation 13,18 , light-induced pupil constriction 15,17,19 and mydriasis. 20 However, no studies have quantified the cycloplegic effect on the central vault. Cyclopentolate is a drug that dilates the pupil and relaxes accommodation. Preoperative and postoperative evaluations of post-cyclopentolate instillation (by cycloplegic eyedrops) are necessary with patients who ...

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Buffering zone of implantable Collamer lens sizing in V4c

Cited by 33 publications

References 24 publications

Prediction of anterior chamber volume after implantation of posterior chamber phakic intraocular lens

Prediction of anterior chamber volume after implantation of posterior chamber phakic intraocular lens

Analysis of pre-operative factors affecting range of optimal vaulting after implantation of 12.6-mm V4c implantable collamer lens in myopic eyes

Vault changes after cyclopentolate instillation in eyes with posterior chamber phakic intraocular lens

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