International Journal of Clinical Research

Objective To analyze the consistency of corneal diameter and anterior chamber diameter in Phakic eyes with posterior chamber intraocular lens implantation (implantable collamer lens, ICL). Methods Retrospective series of case studies. 160 cases (160 eyes) of ICL ametropia were performed in the refractive center of Xian Aier Eye Hospital from January to December 2019. The corneal diameter (White-to-white measurement, WTW) was measured with Pentacam, Topolyzer, IOL Master500 and ruler before operation. The diameter of anterior chamber (Angle-to-angle diameter, ATA) was measured by HD-OCT. Based on the values of ATA and ACD measured by HD-OCT, ICL implantation was performed by on-line calculation (STAAR system). According to the models of ICL lens implanted, all patients were divided into 4 groups (12.1,12.6,13.2,13.7). WTW and ATA in the four groups were analyzed by Pearson correlation, intra-group correlation coefficient (ICC) and Bland-Altman method. Results The average vault of the four models 6 months after ICL implantation were 305.41 ±45.22 μm, 417.61 ±101.27 μm, 486.37 ±83.82μm and 597.41 ±185.25μm,There was significant difference between ATA and WTW measured by four kinds of instruments in pairwise pairs among the four groups (P< 0.01). The ICC between ATA and WTW in 4 groups is 0.619-0.898. There was a strong correlation between ATA and WTW in 12.6 and 13.2 groups (r = 0.718-0.881, 0.816-0.868, P < 0.01). There was a weak correlation between ATA and WTW in groups 12.1 and 13.7 (r = 0.641-0.724 ,0.621-0.694, P < 0.01). Conclusions The postoperative average vault of ICL calculated on the basis of ATA is ideal and predictable, 12.6,13.2 models of ATA and WTW have good consistency in measurement.

Implantable Collamer Lens; Corneal Diameter; Anterior Chamber Diameter