J Korean Ophthalmol Soc.  2012 Jun;53(6):761-766.

Effects of Transient Prone Position on Vault and Anterior Chamber Angle in ICL Implanted Patients

• Kim WK
• Ryu IH
• Kim JK
• Yang H

Abstract

PURPOSE
To evaluate the effects of transient prone position on vault and anterior chamber angle parameters in ICL implanted patients.
METHODS
40 eyes of 20 ICL implanted patients with at least 1 month of follow-up were included in the present study. The central ICL vault and anterior chamber parameters including angle opening distance at 500 (AOD500) were measured with the Visante anterior segment optical coherence tomography (OCT) (Carl Zeiss, Dublin, CA) in both the sitting and prone positions by tilting the OCT 90 degrees in the vertical axis and having the patient fixate downwards towards the floor.
RESULTS
The mean central vault was 0.55 +/- 0.21 mm (SD) and 0.59 +/- 0.21 mm (SD) in the sitting and prone positions, respectively (p < 0.0001). The nasal and temporal AOD500 were 0.26 +/- 0.11 mm and 0.28 +/- 0.08 mm, respectively in the sitting position, which decreased to 0.24 +/- 0.10 mm and 0.26 +/- 0.08 mm in the prone position, however, both were not statistically significant (p = 0.08, p = 0.09). AOD500 was inversely correlated with vault (r = -0.47; p = 0.0024). There were no significant correlations between increase of vault and anterior chamber depth or white to white nor ICL vault.
CONCLUSIONS
Transient prone positioning of ICL implanted patients can induce a significant increase in ICL vault.

Keyword

Angle opening distance 500; Implantable collamer lens; Phakic intraocular lens; Position change; Vaulting

MeSH Terms

Anterior Chamber
Axis, Cervical Vertebra
Eye
Follow-Up Studies
Humans
Phakic Intraocular Lenses
Prone Position
Tomography, Optical Coherence

Figure

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  Figure 1 Box plot showing the change in vault (A), nasal AOD500 (B) and temporal AOD500 (C) between prone position and sitting position.

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  Figure 2 Scatter diagrams with line of equality showing the changes in nasal AOD500 (A) and temporal AOD500 (B) induced by transient prone position.

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