London Vision Clinic, London, UK.
J Refract Surg. 2013 Jan;29(1):30-5. doi: 10.3928/1081597X-20121210-02.
To compare vault height predictability of Implantable Collamer Lens (ICL; Staar Surgical) sizing using a sulcus diameter-based formula or the manufacturer-recommended white-to-white-based method.
In 50 myopic eyes, ICL size was calculated using both a formula including sulcus diameter and the traditional formula based on white-to-white diameter. Sulcus diameter was measured using Artemis 2 very high-frequency (VHF) digital ultrasound (ArcScan Inc). Implantation was based on the sulcus diameter derived size. Actual postoperative vault height achieved was measured by VHF digital ultrasound scanning. Circle segment trigonometry was used to calculate the vault height that would have resulted had lens sizing been based on the white-to-white formula.
The same lens size would have been used in 60% of eyes, a smaller lens would have been used in 34% of eyes and a larger lens in 6% of eyes had lens sizing been based on the white-to-white formula. Mean vault for eyes with lenses sized using the sulcus diameter formula was 0.37±0.16 mm (range: 0.08 to 0.92 mm), with 2% <0.09 mm, the recognized low-vault height for risk of cataract. Circle segment trigonometry predicted that the vault height would have been 0.24±0.28 mm (range: -0.31 to 0.92 mm), with 26% <0.09 mm had lens sizing been based on the white-to-white formula.
Significantly better predictability of postoperative vault height was achieved by including sulcus diameter into the ICL sizing formula compared with using the traditional white-to-white-based formula.
比较基于巩膜隧道直径的公式与制造商推荐的基于角膜缘-角膜缘的 ICL（Staar Surgical）型号计算法预测拱高的能力。
在 50 只近视眼中，使用包括巩膜隧道直径的公式和基于角膜缘-角膜缘直径的传统公式计算 ICL 型号。使用 Artemis 2 甚高频（VHF）数字超声（ArcScan Inc）测量巩膜隧道直径。根据所得巩膜隧道直径大小进行植入。使用甚高频数字超声扫描测量实际术后拱高。采用圆段三角学计算如果根据角膜缘-角膜缘公式进行镜片尺寸计算将会获得的拱高。
如果根据角膜缘-角膜缘公式进行镜片尺寸计算，60%的眼中会使用相同的镜片尺寸，34%的眼中会使用较小的镜片，6%的眼中会使用较大的镜片。使用巩膜隧道直径公式进行镜片尺寸计算的眼中，平均拱高为 0.37±0.16mm（范围：0.08 至 0.92mm），其中 2%<0.09mm，这是白内障风险的公认低拱高。圆段三角学预测，如果根据角膜缘-角膜缘公式进行镜片尺寸计算，拱高将为 0.24±0.28mm（范围：-0.31 至 0.92mm），其中 26%<0.09mm。
与传统基于角膜缘-角膜缘的公式相比，在 ICL 型号计算中纳入巩膜隧道直径可显著提高术后拱高的预测能力。
