Implantable Collamer Lens Vault Measurement Using Two Different Optical Coherence Tomography Imaging Techniques

To investigate the potential difference of Implantable collamer lens (ICL) vault measurement between a swept-source optical coherence tomography (SS-OCT, Anterion) and a spectral-domain OCT (SD-OCT, RTVue XR Avanti).

A retrospective, cross-sectional observational study.

All included eyes underwent ICL implantation without surgical complications. An experienced technician randomly used the Anterion SS-OCT and Avanti SD-OCT to capture anterior segment images on the same day and under the same conditions. The ICL vault in the horizontal and vertical directions was manually measured and recorded for analysis. Paired sample t-test and Bland-Altman plots were used to test the difference and agreement between the two devices.

Fifty-three eyes were included in the final data analysis. The ICL vault of Anterion and Avanti in the horizontal direction were 506±159μm and 505±165μm, respectively. The ICL vault of Anterion and Avanti in the vertical direction were 502±152μm and 493±152μm, respectively. No significant vault difference was noticed between the two devices in both directions (P > 0.05). The 95% limits of agreement for vault measurement between the two devices were -90 to 100μm for horizontal direction and -89 to 113μm for vertical direction, respectively.

Good agreement was observed between Anterion SS-OCT and Avanti SD-OCT in measuring the ICL vault.