Evaluation of pupil diameter after posterior chamber phakic intraocular lens implantation

Kamiya, Kazutaka; Shimizu, Kimiya; Igarashi, Akihito; Ishikawa, Hitoshi

doi:10.1038/eye.2009.170

Cited by 22 publications

(15 citation statements)

References 37 publications

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“… 14 , 22 It was shown that there was also no significant correlation between pupil diameter changes and the ICL vault. This finding is in accordance with Kamiya et al’s study, 23 whose results showed no significant correlation between the entrance pupil diameter and the amount of vaulting after ICL implantation.…”

Section: Discussionsupporting

confidence: 93%

Pupil Diameter Changes in High Myopes after Collamer Lens Implantation

Li¹,

Yang²,

Su³

et al. 2015

Optometry and Vision Science

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PurposeTo observe the changes in pupil size under photopic and scotopic conditions after Implantable Collamer Lens (ICL) implantations in eyes with high myopia.MethodsThe ICL was implanted in 90 eyes belonging to 45 patients with high myopia. Photopic pupil diameters, scotopic pupil diameters, anterior chamber depths, and ICL vaults were examined at the preoperative, postoperative 1-month, and postoperative 3-month stages. The preoperative and postoperative photopic pupil diameters and scotopic pupil diameters were also compared with each other to note the differences between them. The correlations between preoperative and postoperative pupil diameter changes under different light conditions and presurgical refractive error were analyzed alongside patient’s age and ICL vault.ResultsPupil diameters at both postoperative 1-month and postoperative 3-month stages were smaller than those before operation in distinct light environments, as well as pupil constriction amplitude. Correlation analysis showed that there was a statistically significant correlation between pupil diameter changes under different light conditions and presurgical refractive error at 1 month and 3 months after ICL implantation; pupil diameter decreased more when presurgical refractive error powers were less myopic. Statistically significant correlations were not found, however, with patient’s age and ICL vault. Postoperative 1-month and mean postoperative 3-month anterior chamber depths were decreased when compared with preoperative anterior chamber depths. Statistically significant correlations were found in change in preoperative and postoperative anterior chamber depth and ICL vault. No statistically significant difference was found between ICL vault at the postoperative 1-month and postoperative 3-month stages.ConclusionsPupil diameter may decrease at the 1- and 3-month stages after ICL implantation under both photopic and scotopic conditions. This indicates that reduction of pupil diameter may be caused by mechanical contact between the ICL and the posterior iris surface.

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Section: Discussionsupporting

confidence: 93%

Pupil Diameter Changes in High Myopes after Collamer Lens Implantation

Li¹,

Yang²,

Su³

et al. 2015

Optometry and Vision Science

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“…The vault after ICL V4c implantation was essentially equivalent to the vault after ICL V4 implantation, suggesting that the presence of the central hole did not significantly affect the postoperative vault. With regards to the short term changes after surgery, we found a significant association between the vault changes and the pupil size changes from 1 day to 1 month after the implantation of both ICL V4 and ICL V4c IOLs, concluding that pupil size change is a critical factor in vault change, which is consistent with previous relevant studies [12–16, 18, 24]. We also found a relatively high vault 1 day after surgery in a select number of eyes with small pupils.…”

Section: Discussionsupporting

confidence: 91%

“…Several studies [12–15] have shown that pupil constriction leads to a significant decrease in central vault under photopic conditions, as it causes ICL movement posteriorly towards the crystalline lens. These findings have been supported by Du et al [16] who demonstrated similar outcomes during pharmacological accommodation with the use of topical pilocarpine.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies [12–15] have shown that the pupil constriction in response to light can affect the vault, eventually causing the ICL to move posteriorly towards the crystalline lens, leading to a significant decrease in central vault under photopic conditions. Du et al [16] reported that the distance between the ICL and the crystalline lens reduced as the ICL was moved posteriorly by the iris as a result of pupil constriction during pharmacologic accommodation with topical pilocarpine.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of early changes in and factors affecting vault following posterior chamber phakic Implantable Collamer Lens implantation without and with a central hole (ICL V4 and ICL V4c)

et al. 2016

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BackgroundTo objectively compare the early changes in vault over time following implantation of an Implantable Collamer Lens without (ICL V4) and with (ICL V4c) a central hole and the respective factors affecting vault change in moderate to high myopia.MethodsThis prospective study comprised of 38 eyes of 38 patients implanted with ICL V4 and 39 eyes of 39 patients implanted with ICL V4c intraocular lenses. We quantitatively assessed the postoperative values of vault and pupil size at 1 day, 1 week, and 1 month following implantation using a rotating Scheimpflug camera (Pentacam). We compared these postoperative values within and between the two groups and identified the factors affecting vault change.ResultsThe mean vaults at 1 day, 1 week, and 1 month following ICL V4 implantation were 303.68 ± 185.11, 517.89 ± 160.07 and 521.32 ± 155.72 μm respectively, and those following ICL V4c were 316.67 ± 186.89, 495.13 ± 180.84 and 510.77 ± 175.51 μm, respectively. There was a significant difference in vault between 1 day and 1 week postoperatively. There was a significant association between the vault change and the pupil size change in both groups from 1 day to 1 month postoperatively (Pearman correlation coefficient; ICL V4: r = 0.585, P = 0.001; ICL V4c: r = 0.588, P <0.001). The vault value 1 month after implantation of ICL V4 and ICL V4c was associated with the preoperative anterior chamber depth, horizontal corneal diameter, horizontal and vertical sulcus-to-sulcus.ConclusionsPupil movement is a critical factor in vault change, with increasing vault observed postoperatively from 1 day to 1 week associated with the declining effects of pharmacological miosis and increasing pupil size. The anterior chamber depth, horizontal corneal diameter, horizontal and vertical sulcus-to-sulcus show some correlation with vault.Electronic supplementary materialThe online version of this article (doi:10.1186/s12886-016-0336-8) contains supplementary material, which is available to authorized users.

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“…Several previous studies have reported that changes in pupil size in response to certain stimuli, such as photopic light exposure or during accommodation, are associated with postoperative vaulting [ 24 – 26 ]. In a previous study, we demonstrated that pupil constriction in response to photopic light exposure creates an antero-posterior vector via iris constriction, in which the iris exerts pressure on the ICL [ 23 ].…”

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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Evaluation of pupil diameter after posterior chamber phakic intraocular lens implantation

Cited by 22 publications

References 37 publications

Pupil Diameter Changes in High Myopes after Collamer Lens Implantation

Pupil Diameter Changes in High Myopes after Collamer Lens Implantation

Comparison of early changes in and factors affecting vault following posterior chamber phakic Implantable Collamer Lens implantation without and with a central hole (ICL V4 and ICL V4c)

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

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