J Korean Ophthalmol Soc.  2012 Aug;53(8):1081-1087. 10.3341/jkos.2012.53.8.1081.

The Effect of Lens Thickness to Anterior Chamber Depth on the Vault after ICL Implantation

• Kim WK
• Yang H
• Cho EY
• Kim HS
• Kim JK

• KMID: 2215949
• DOI: http://doi.org/10.3341/jkos.2012.53.8.1081

Abstract

PURPOSE
To evaluate the crystalline lens thickness/anterior chamber depth (CLT/ACD) ratio as a preoperative factor that affects the vault after implantable contact lens (ICL) implantation.
METHODS
A total of 130 eyes of 130 patients who received bilateral ICL implantation were included in the present study. The preoperative CLT/ACD ratio was analyzed to determine if the patients had any correlation with postoperative vault by Visante optical coherence tomography (OCT).
RESULTS
The mean vault was 0.58 mm +/- 0.23 at postoperative 2 months. Eight eyes (6.15%) had low vault, 93 eyes (71.53%) had ideal vault and 29 eyes (29.31%) had high vault. The CLT/ACD ratios were 1.04 mm +/- 0.11, 0.96 mm +/- 0.09 and 0.90 mm +/- 0.09 in the low vault group, ideal vault group and high vault group, respectively (p < 0.01). The CLT/ACD ratio showed statistically significant correlations with postoperative vault in univariate analysis (r = -0.4718; p < 0.01) and in multivariate analysis (p < 0.01).
CONCLUSIONS
Vaults after ICL implantation have a negative correlation with the preoperative CLT/ACD ratio. The results from the present study may improve the prediction of postoperative vault after ICL implantation.

Keyword

Anterior chamber depth; Implantable collamer lens; Lens thickness; Phakic intraocular lens; Vault

MeSH Terms

Anterior Chamber
Eye
Humans
Lens, Crystalline
Lenses, Intraocular
Multivariate Analysis
Phakic Intraocular Lenses
Tomography, Optical Coherence

Figure

• 

  Figure 1 An example of preoperative ultrasound A scan (US-1800, Nidek Inc., Japan) result showing axial parameters including ACD (anterior chamber depth) and Lens (crystalline lens thickness) of both eyes. In this example, the lens thickness to external ACD of the right eye is 1.04 (3.65 mm/3.51 mm).

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  Figure 2 Scatter diagrams with regression line showing the negative correlation of preoperative lens thickness/external anterior chamber depth and vault by Visante OCT. POD = postoperative day; ACD = anterior chamber depth; OCT = optical coherence tomography.

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  Figure 3 Box-and-whisker plot (A) and dots plot (B) showing the distribution of preoperative lens thickness/external anterior chamber depth according to postoperative vault, by which 3 groups were made. That is low vault group (<250 µm), ideal vault group (250 µm-750 µm) and high vault group (>750 µm). ACD = anterior chamber depth.

• 

  Figure 4 ROC (receiver operating characteristic) curve of preoperative crystalline lens thickness/anterior chamber depth between low vault versus ideal vault group (A), and between high vault versus ideal vault (B).

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