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First Author: X.Wang CHINA
Co Author(s): X. Chen F. Chen X. Zhou
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To investigate the correlations between the anterior segment structures change and straylight after Collamer posterior chamber phakic intraocular lens(pIOL) implantation in high myopic eyes.
Department of Ophthalmology, Eye & Ear Nose Throat Hospital, Shanghai, China
Implantable Collamer lens(ICL) implantation was performed on 91 eyes (46 patients). The anterior segment anatomic parameters and intraocular straylight parameter log(s) were measured before and after surgery(1 week to 3 months) by Scheimpflug image photography and C-Quant straylight meter respectively. Correlations were analyzed between the log(s) and following parameters, such as anterior chamber depth(ACD), pIOL spherical equivalent(SE), best corrected visual acuity(BCVA), pupil size, axial length and ICL vaulting.
The log(s) decreased from preoperative 1.27 ±0.15 units to postoperative 1.21 ±0.14 units, but there was no significant statistic difference (P=.128). Higher postoperative log(s) were found significantly correlated to lower vaulting(r=-0.361; P=.022), lower ratio of vault to cornea-lens distance(r=-0.444; P=.004) and lower negative diopters of pIOL SE(r=0.327; P=.039). Using regression analysis, the ratio of vault to postoperative cornea-lens distance, and the postoperative iris-lens distance were two independent predictors of log(s) (P=.003 and P=.049).
Straylight seems to reduce in short-term after ICL surgery. Although there are some correlations between several anterior segment anatomic parameters with straylight, the overall correlation may be eliminated by other potential complex interactions of factors. The cornea-pIOL- crystalline lens, the relative position between the objects, and the refractive power of pIOL posterior surfaces are the factors contributing to starylight influence