The analysis of influencing factors associated with night vision disturbances after implantable contact lens implantation

Abstract

Objective To investigate the influencing factors of night vision disturbances after implantable contact lens implantation. Methods Fifty eyes of 25 patients who underwent implantable contact lens implantation in both eyes were retrospectively reviewed. The incidence and severity of night vision disturbances were evaluated using questionnaires 6 months after surgery. Univariate sample and multiple logistic regression analyses were used to detect influencing factors associated with postoperative night vision disturbances. Potential influencing factors included in the analysis were keratometric value, anterior chamber depth, postoperative residual refractive error, higher-order aberrations, preoperative and postoperative mesopic pupil size, the difference between preoperative and postoperative mesopic pupil size, the difference between mesopic pupil size and implantable contact lens optic zone diameter, corneal transverse diameter, sulcus-to-sulcus diameter, and postoperative implantable contact lens vaulting. The power, size, optic zone diameter, and toridity of the implantable contact lens were also included as variables. Results The incidence of night vision disturbances was 34.00% for halos and 26.00% for glare. Halos were found to be significantly related to: (1)The difference between mesopic pupil size and implantable contact lens optic zone diameter (P=0.013); (2)The corneal transverse diameter (P=0.028); (3)The implantable contact lens optic zone diameter (P=0.030). For glare, toricity of the implantable contact lens was revealed as a significant influencing factor (P=0.047). Conclusion Conclusions Possible influencing factors for night vision disturbances include implantable contact lens optic zone diameter, the difference between mesopic pupil size and implantable contact lens optic zone diameter, and the corneal transverse diameter which can cause halos, and the toricity of the implantable contact lens which can cause glare. Key words: Lens, contact, implantable; Vision, night; Eye, phakic