The implantable collamer lens(ICL), a posterior chamber phakic intraocular lens, a surgical technique for the correction of moderate to high myopia, has been widely accepted for its stable results, high predictability and good visual quality. However, the success of the operation largely depends on the ICL vault. High or low vault is likely to cause a series of potential complications such as ocular hypertension, cataracts, etc. This article summarizes the related factors that affect the vault after ICL implantation.