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Park and Chung: Result of Central Vault Depending on Lens Diameters in Patients with Implantable Collamer Lens Implantation
Original Article

Journal of the Korean Ophthalmological Society 2019; 60(12): 1191-1197.

Published online: 17 December 2019

DOI: https://doi.org/10.3341/jkos.2019.60.12.1191

Result of Central Vault Depending on Lens Diameters in Patients with Implantable Collamer Lens Implantation

Kibum Park, MD, Jin Kwon Chung, MD, PhD

Department of Ophthalmology, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.

Address reprint requests to Jin Kwon Chung, MD, PhD. Department of Ophthalmology, Soonchunhyang University Seoul Hospital, #59 Daesagwan-ro, Yongsan-gu, Seoul 04401, Korea. Tel: 82-2-709-9354, Fax: 82-2-710-3196, schcornea@schmc.ac.kr

Received 16 May 2019       Revised 26 June 2019       Accepted 6 December 2019

©2019 The Korean Ophthalmological Society

The Korean Ophthalmological Society

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To compare vaulting height and clinical results in patients who underwent anterior chamber phakic intraocular lens implantation with different lens diameters.

Methods

Thirty-five eyes (19 patients) who underwent anterior chamber phakic intraocular lens (V4C or V5) implantation were divided into two groups according to lens diameters, which were based on the patient C or V5) implantation were dividdiameters. Group 1 was implanted with a 12.6 mm diameter lens (WTW, 11.3–11.7 mm; 22 eyes) and group 2 was implanted with a 13.2 mm diameter lens (WTW, 11.8–12.2 mm; 13 eyes). Changes in the central vault over time, refractive error, visual acuity, endothelial cell count, and complications were evaluated as clinical outcomes.

Results

The post operative mean central vaulting heights at 1, 3, and 6 months Group 2 showed significantly higher vaulting at each visit (all, p < 0.05). High vaulting (greater than 750 mm) at 1, 3, and 6 months after surgery involved 27% (6 eyes), 27% (6 eyes), and 18% (4 eyes) in group 1 and 69% (9 eyes), 61% (8 eyes), and 53% (7 eyes) in group 2 (p < 0.05), respectively. Uncorrected distance visual acuity (logMAR) and spherical equivalent were not significantly different between two groups (p > 0.05).

Conclusions

The results of optimal vaulting shows the lens diameter should be adjusted according to the surgeon's experience or nomogram when the horizontal corneal WTW diameter was used to determine lens diameter. Especially in cases using a V4C or V5 model anterior chamber phakic intraocular lens, 13.2 mm in diameter (V5) shows higher central vaulting than 12.6 mm in diameter (V4C).

Keywords: Anterior chamber depth, Implantable collamer lens, Vaulting, White-to-white

Figures and Tables

Table 1

Baseline characteristics of the two groups

jkos-60-1191-i001

Values are presented as mean ± standard deviation or number (%). ‘Group 1’ is 12.6 mm in diameter, ‘Group 2’ is 13.2 mm in diameter.

WTW = white to white diameter; ORB = Orbscan II corneal topography; ACD = anterior chamber depth; SE = spehrial equivalent; D = diopters; UDVA = uncorrected distant visual acuity; logMAR = logarithm of minimal angle of resolution.

*p-value was acquired from Mann Whitney U-test; †Fisher exact test.

Table 2

Comparison of changes in central vault at post op. 1, 3, and 6 months between two groups

jkos-60-1191-i002

Values are presented as mean ± standard deviation or number. ‘Group 1’ is 12.6 mm in diameter, ‘Group 2’ is 13.2 mm in diameter.

op. = operation; Diff. = difference.

*p-value was acquired from the Wilcoxon signed rank test. Postoperative central vault in 1 month was compared with 6 months; †p-value was acquired from Mann Whitney U-test. Postoperative central vault in group 1 was compared with group 2.

Table 3

Comparison of high vault ratio between the two groups

jkos-60-1191-i003

Values are presented as number (%). Comparison of high vault ratio between the two groups in each follow up period.

op. = operation.

*p-values were acquired from chi-square test.

Table 4

Comparison of changes in ECC at pre op. and post op. 6 months in each group

jkos-60-1191-i004

Values are presented as mean ± standard deviation or number (%). ‘Group 1’ is 12.6 mm in diameter, ‘Group 2’ is 13.2 mm in diameter.

ECC = endothelial cell count; op. = operation.

*p-value was acquired from the Wilcoxon signed rank test.

Notes

Conflicts of Interest The authors have no conflicts to disclose.

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