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Purpose <p>This study aimed to investigate the impact of the iris-ciliary angle (ICA) on the position of the implantable collamer lens (ICL) haptic and vault following ICL implantation.</p> Methods <p>A prospective, observational study was conducted using data from 135 patients who underwent horizontal ICL implantation. Patients were categorized into three groups by ICA: ICA1 (0–32°), ICA2 (32–64°), and ICA3 (64–96°) to compare parameters. The parameters correlated with the distance from the iris root to the end of the ICL haptic (IRH) and vault was analysed respectively. A multiple linear stepwise regression model was constructed to estimate IRH.</p> Results <p>The vault decreased sequentially across the three groups (<i>P</i> &lt; 0.001) and was negatively correlated with ICA (<i>P</i> &lt; 0.001). The proportion of ICL haptic insertion under the ciliary body was significantly higher in the ICA3 group compared with the ICA1 and ICA2 groups (<i>P</i> = 0.039). Stepwise regression analysis showed that IRH = -1.174 + 0.005 × ICA + 0.118 × horizontal sulcus-to-sulcus (STS) distance (adjusted R<sup>2</sup> = 0.334, Durbin-Watson value = 1.908, <i>P</i> &lt; 0.001), with ICA as the primary influencing factor (<i>β</i> = 0.536, <i>P</i> &lt; 0.001), followed by horizontal STS distance (<i>β</i> = 0.348, <i>P</i> &lt; 0.001).</p> Conclusions <p>When the ICA is excessively large, the ICL haptic is more likely to be inserted under the ciliary body. An increase in ICA is associated with a greater IRH and a lower vault.</p> Key messages <p><Emphasis Type="BoldItalic">What is known</Emphasis>:</p> <p>• More posterior chamber anatomical parameters of eyes are needed to improve the accuracy of predicting the vault.</p> <p>• A negative correlation exists between the iris-ciliary angle (ICA) and vault.</p> <p><Emphasis Type="BoldItalic">What is new</Emphasis>:</p> <p>• When the ICA is excessively large, the ICL haptic is more likely to be inserted under the ciliary body.</p> <p>• The ICA is the primary influencing factor when predicting the distance from the iris root to the end of the ICL haptic (IRH).</p>

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Correlation of iris-ciliary angle with haptic position and vault after implantation of implantable collamer lens

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Wenxin Xue,
  • Xiaohang Jiao,
  • Weiqun Wang,
  • Yanhui Bai

摘要

Purpose

This study aimed to investigate the impact of the iris-ciliary angle (ICA) on the position of the implantable collamer lens (ICL) haptic and vault following ICL implantation.

Methods

A prospective, observational study was conducted using data from 135 patients who underwent horizontal ICL implantation. Patients were categorized into three groups by ICA: ICA1 (0–32°), ICA2 (32–64°), and ICA3 (64–96°) to compare parameters. The parameters correlated with the distance from the iris root to the end of the ICL haptic (IRH) and vault was analysed respectively. A multiple linear stepwise regression model was constructed to estimate IRH.

Results

The vault decreased sequentially across the three groups (P < 0.001) and was negatively correlated with ICA (P < 0.001). The proportion of ICL haptic insertion under the ciliary body was significantly higher in the ICA3 group compared with the ICA1 and ICA2 groups (P = 0.039). Stepwise regression analysis showed that IRH = -1.174 + 0.005 × ICA + 0.118 × horizontal sulcus-to-sulcus (STS) distance (adjusted R2 = 0.334, Durbin-Watson value = 1.908, P < 0.001), with ICA as the primary influencing factor (β = 0.536, P < 0.001), followed by horizontal STS distance (β = 0.348, P < 0.001).

Conclusions

When the ICA is excessively large, the ICL haptic is more likely to be inserted under the ciliary body. An increase in ICA is associated with a greater IRH and a lower vault.

Key messages

What is known:

• More posterior chamber anatomical parameters of eyes are needed to improve the accuracy of predicting the vault.

• A negative correlation exists between the iris-ciliary angle (ICA) and vault.

What is new:

• When the ICA is excessively large, the ICL haptic is more likely to be inserted under the ciliary body.

• The ICA is the primary influencing factor when predicting the distance from the iris root to the end of the ICL haptic (IRH).