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Comparison of clinical outcomes between posterior chamber phakic implantable Collamer lens with and without a central hole (ICL V4c and ICL V4) to assess the effects of the V4c central hole upon the quality of vision in mild to moderate myopic eyes

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First Author: Z.Liu CHINA

Co Author(s):    E. Pazo   H. Huang   L. Li   Y. Zhao   L. Xu   W. He     

Abstract Details

Purpose:

The 360 μm central hole is found in the central optical zone of V4c ICL, which provides improved circulation of aqueous humour to the anterior surface of the crystalline lens, maintains intraocular pressure (IOP) without additional peripheral iridotomy. In the present study, we compare the refractive outcomes and visual performance between V4c (with hole) and V4 (without hole) ICL in a prospective study.

Setting:

He Eye Hospital, Shenyang, China

Methods:

This retrospective study included 212 eyes of 106 patients at an outpatient ophthalmology clinic who underwent V4c (106 eyes) and V4 (106 eyes) ICL implantation. All patients underwent, visual acuity (VA) tests, Pentacam (Oculus), OPD-III (Nidek) dynamic AS-OCT (Casia2; Tomey) under photopic and scotopic conditions, interocular pressure, quality of vision (QOV) questionnaire postoperatively and six months after surgery, these findings were evaluated and compared. Primary outcome measures were VA, higher-order aberrations (HOAs) (entire, corneal and internal), and QOV.

Results:

Near vision, UDVA, and BCVA showed no significant difference between ICL V4c implantation and ICL V4 implantation (P>.05). However, high-order aberrations and spherical aberrations were higher in ICL V4c implantation than in ICL V4 implantation (P<.05). Low-order aberrations (defocus and astigmatism) and coma, had no significant difference between the two models of ICL (P>.05). Dysphotopsia as assessed by the QOV questionnaire was higher in V4c group but not significantly different between the two groups. Additionally, the correlation between dysphotopsia (halo: r=0.38; glare: r=0.42; starburst: r=0.32) and entire HOA was significant (P<0.05).

Conclusions:

The V4c and V4 ICL models achieved similar visual and refractive outcomes, whereas the V4 model had lesser night vision symptoms. The presence of the 360 μm central hole is found in the central optical zone of V4c ICL can lead to increased HOAs and therefore lead to mild dysphotopsia in challenging lighting conditions.

Financial Disclosure:

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