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Kim, Kim, Cho, Kim, and Yang: Effects of Prone Positioning on Critical Distance in Iris-Claw Phakic Intraocular Lens-Implanted Eyes
Original Article
Journal of the Korean Ophthalmological Society

Journal of the Korean Ophthalmological Society 2012; 53(9): 1254-1259.

Published online: 17 September 2012

DOI: https://doi.org/10.3341/jkos.2012.53.9.1254

Effects of Prone Positioning on Critical Distance in Iris-Claw Phakic Intraocular Lens-Implanted Eyes

Wook Kyum Kim, MD1, 2, Hee Sun Kim, MD1, Eun Young Cho, MD1, Jin Kook Kim, MD1, 2, Hun Yang, MD1

1B&VIIT Eye Center, Seoul, Korea.

2KAIST GSMSE, Daejeon, Korea.

Address reprint requests to Hun Yang, MD. B&VIIT Eye Center, #3 Seocho-dearo 77-gil, Seocho-gu, Seoul 137-857, Korea. Tel: 82-80-722-0202, Fax: 82-2-501-6435, hunny502@hanmail.net

Received 2 August 2011       Accepted 12 August 2012

Copyright © 2012 The Korean Ophthalmological Society

Abstract

Purpose

To evaluate the effects of prone positioning on the critical distance (CD) in Artiflex (Ophtec BV) foldable anterior iris-claw phakic intraocular lens (pIOL)-implanted eyes.

Methods

Twenty patients with 40 Artiflex-implanted eyes were prospectively enrolled in the present study. The nasal and temporal critical distances (CD) were measured with Visante anterior segment optical coherence tomography (OCT, Carl Zeiss, Dublin, CA) in both the sitting and prone positions.

Results

The mean nasal CD was 1.52 ± 0.15 mm in the sitting position and 1.49 ± 0.13 mm in the prone position (p = 0.01). The mean temporal CD was 1.63 ± 0.17 mm in the sitting position and 1.63 ± 0.16 mm in the prone position (p = 0.67). In a multiple regression analysis, the changes in nasal CD were positively correlated with anterior chamber volume (r = 0.27; p = 0.01) and negatively correlated with pupil size (r = -0.23; p < 0.01).

Conclusions

Prone positioning can induce a decrease in the nasal CD in Artiflex-implanted patients, especially in subjects with small pupils and large anterior chamber volumes.

Keywords: Artiflex, Critical distance, Iris claw, Phakic intraocular lens, Prone position

Figures and Tables

Figure 1
Box plot showing the change of critical distance nasal (A) and temporal (B) between sitting and prone position.
jkos-53-1254-g001
Table 1
General characteristics in 20 patients (40 eyes) with myopia who underwent Artiflex iris-claw phakic intraocular lens implantation
jkos-53-1254-i001

Values are presented as mean ± SD.

BCVA = best corrected visual acuity; IOP = intraocular pressure; AC = anterior chamber; ACD = anterior chamber depth; CCT = central corneal thickness; WTW = white to white distance; CD = cellular density; UCVA = uncorrected visual acuity.

Table 2
Comparison of critical distances between sitting and prone position
jkos-53-1254-i002

*Paired t-test was done; †Student's t-test was done.

Table 3
Multivariate analysis of ocular factors affecting the change of nasal critical distance induced by prone position in Artiflex implanted eyes
jkos-53-1254-i003

SE = spherical equivalent; AC = anterior chamber.

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