Visual function assessment of posterior-chamber phakic implantable collamer lenses with a central port

Abstract

Background: To investigate the short-term visual function of the V4c implantable collamer lens (ICL) for myopia using a Binoptometer 4P.Methods: Eighty eyes from 40 patients (age, 28.75±6.57 years) who underwent ICL V4c implantation at Shenzhen Eye Hospital from August 2020 to June 2021 were enrolled. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), subjective manifest refraction, intraocular pressure (IOP), and corneal endothelial cell density (ECD) were evaluated 1 month after surgery. Corrected distance visual acuity (CDVA), corrected near visual acuity (CNVA), contrast sensitivity (CS), near stereoacuity (NSA), twilight vision, and glare sensitivity were measured using a Binoptometer 4P. Results:The average logMAR (logarithmic minimum angle of resolution) UCVA postoperative was 0.07±0.13, which was significantly better than the preoperative BCVA (P=0.028). At 1 month postoperatively, the mean safety and efficacy indexes were 1.14±0.24 and 0.98±0.16, respectively. The mean spherical equivalent (SE) of all eyes was −8.98±3.20 D preoperatively, and −0.16±0.48 D postoperatively. None of the patients lost one or more lines of BCVA, 62.1% remained unchanged, 10.6% gained one line, and 27.3% gained two or more lines. CDVA, CNVA, CS, and NSA of both eyes were measured using a Binoptometer 4P, which were significantly better than the preoperative values. In addition, some patients had subjective symptoms in the early postoperative period, such as halo, glare, etc.Conclusions: ICL V4c implantation is a safe, effective, and predictable solution for myopia. We found that the short-term visual function of patients was improved significantly. The Binoptometer 4P is an effective and convenient visual testing device for assessing postoperative visual function after ICL V4c implantation.

Visual outcomes and subjective experience with three intraocular lenses based presbyopia correcting strategies in cataract patients

“…The contrast sensitivity was assessed by the Binoptometer 4P 14 . The test was set at a virtual distance of 3 m and the luminance was set at 130 cd/m 2 .…”

Analysis of perioperative problems related to intraocular Implantable Collamer Lens (ICL) implantation

“…58% of the patients reported a worsening in night vision symptoms (mostly nonspecific glare and halo or starburst) after surgery, but overall levels of satisfaction were high [ 46 , 47 ]. The incidence of halo after ICL implantation was 68.8%, and that of starburst was 43.8% [ 48 ].…”

Stereopsis after bilateral implantation of Toric intraocular lenses in high myopic cataract patients with astigmatism

“…The measuring method is based on the principle of polarized light, the same as Titmus (range from 600 to 15 arcsec), that has proven to be reliable for measuring stereoacuity. 12 A stereoacuity level of 60 arcsec or better is considered to be good and 100 arcsec is the lowest limit of normal stereoacuity. 13 , 14 To reduce variability, an experienced ophthalmic technician performed the preoperative and postoperative examinations in an identical manner in all cases, and three measurements for each eye were averaged.…”