The Distribution of Crystalline Lens Rise in High Myopia Population and Its Influence on Vault After Implanting Intraocular Collamer Lens

Introduction As a result of the insufficient ocular anatomical parameters used to customize implantable collamer lens (ICL), many patients still cannot achieve a suitable vault after ICL implantation surgery. This study analyzed the characteristics of a new anatomical parameter crystalline lens rise (CLR) in a population with high myopia and explored the influence of CLR on the vault after ICL implantation. Methods Patients (298 eyes) with high myopia who underwent ICL implantation were enrolled to study CLR characteristics. Postoperatively, patients (159 eyes) were divided into five groups according to the value of CLR (A, CLR ≤ − 150; B, − 150 < CLR ≤ 0; C, 0 < CLR < 150; D, 150 ≤ CLR < 300; E, CLR ≥ 300 μm), and to investigate the correlation between CLR and vault. Results In the 298 eyes, the CLR had a normal distribution ( P = 0.35) and the mean CLR was 67.93 ± 150.66 μm. Ninety-nine eyes (33.22%) had a CLR ≤ 0 μm, of which 20 eyes (6.71%) had a CLR ≤ − 150 μm; 199 eyes (66.78%) had a CLR > 0 μm, of which 20 eyes (6.71%) had a CLR ≥ 300 μm. In 159 eyes, the CLR was negatively correlated with the vault at 1 day ( R = − 0.497, P < 0.001), 3 months ( R = − 0.505, P < 0.001), and 6 months ( R = − 0.505, P < 0.001) postoperatively. At 6 months, the vault of group A was statistically significantly different compared to groups B–E (all P < 0.05), and that of group E was statistically significantly different compared to groups A–D (all P < 0.001). The remaining groups did not show statistically significant differences (all P > 0.05). Conclusion The CLR had a normal distribution in the high myopia population, and 13.42% of the CLR values were extreme (CLR ≤ − 150 μm or CLR ≥ 300 μm). A larger ICL diameter than that recommended by the manufacturer should be considered when the CLR is ≥ 300 μm and a smaller ICL diameter should be considered when the CLR is ≤ − 150 μm.