Abstract:AIM: To compare the differences, correlations, and consistency of vault and related parameters measured by the novel swept-source anterior segment optical coherence tomography(CASIA2)with the three-dimensional anterior segment analyzer(Pentacam)after implantable collamer lens(ICL)implantation.
METHODS: A cross-sectional study was conducted on myopic patients who underwent ICL implantation at the Department of Refractive Surgery, Sichuan Eye Hospital, between August 2021 and August 2023. At 1 mo postoperatively, vault, central corneal thickness(CCT), pupil diameter, anterior chamber depth(ACD), and the distance from the corneal endothelium to the anterior surface of the ICL(ACD-ICL)were measured using both CASIA2 and Pentacam. The correlation, differences and agreement of these parameters were analyzed from the two devices.
RESULTS: A total of 100 myopia patients(187 eyes)were included. Significant differences were found between CASIA2 and Pentacam in the measurements of CCT, ACD, pupil diameter, ACD-ICL, and vault(all P<0.05). The correlation analysis showed that the CCT, ACD-ICL, vault, ACD and pupil diameter measured by the two devices were positively correlated(r/rs=0.99, 0.91, 0.91, 0.71, and 0.49, all P<0.05). Bland-Altman analysis showed excellent agreement for CCT, but less agreement for the other parameters.
CONCLUSION: CASIA2 produces marginally higher postoperative vault readings than Pentacam. Besides instrumental design, the discrepancy is likely attributable to pupillary constriction and accommodation induced by Pentacam's brighter illumination. CASIA2 may better reflect physiologic conditions, whereas Pentacam reflects bright-light status. Combined use of both devices provides clinicians with more comprehensive and accurate post-ICL assessments.
