Preoperative factors affecting vaulting after posterior cham
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A study was carried out to explain the very early vault changes in the first month after implanting an Implantable Collamer Lens (ICL) and to assess the impact of preoperative biometric factors on vault.

In this retrospective analysis, 83 eyes from 83 subjects with complete data who met follow-up criteria were recruited. The postoperative vault was evaluated quantitatively at 2 hours, 1 day, 1 week, and 1 month after implantation.

Associations between the postoperative vault and age, ICL size, spherical equivalent (SE), axial length (AL), central corneal thickness (CCT), flat keratometry (K), steep K, mean K, anterior chamber depth (ACD), crystalline lens thickness (LT), white-to-white (WTW) diameter obtained by three devices, horizontal and vertical sulcus-to-sulcus (STS) diameter, bright and dark pupil sizes (BPS and DPS) and DPS-BPS were investigated using Spearman’s correlation analysis and stepwise multiple regression analysis.

--The mean vault values at 2 h, 1 day, 1 week, and 1 month after ICL implantation were 672.05±30.72, 389.15±28.33, 517.23±30.76 and 530.12±30.22 micrometre, respectively.

--Significant differences were found in the vault values at 2 h, 1 day and 1 week after the operation.

--The ICL size (beta=0.942), followed by horizontal STS (beta = -0.517), crystalline LT (beta = -0.376) and vertical STS (beta = -0.257), significantly influenced the vault at 1 month after the operation.

--The multiple regression equation was expressed as follows: central vault (microm) = -1369.05+657.121 × ICL size- 287.408 × horizontal STS -432.497 × crystalline LT -137.33 × vertical STS (adjusted R2=0.643).

In conclusion, the vault decreased and then increased after ICL implantation, but it did not return to the vault value 2 hours later. The scale of the ICL, the horizontal and vertical STS, and the crystalline LT are all important indicators of postoperative vaulting.