Evaluate the stability of intraocular lens after Nd∶YAG laser capsulotomy by reconstructing three-dimensional model of anterior segment optical coherence tomography

Abstract

Objective In order to evaluate the stability of intraocular lens after Nd∶YAG laser capsulotomy with the assessments of anterior chamber depth, intraocular lens (IOL) tilt and decentration. Methods In this prospective study, total 29 patients (35 eyes) enrolled in from March 2013 to September 2014 in Eye Hospital of Wenzhou Medical University. Preoperatively and postoperatively, routine examinations including uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), intraocular pressure (IOP), slit lamp microscope examination of anterior segment, and fundus examination were taken, meanwhile, the assessments of the anterior chamber depth, IOL tilt and decentration by rebuilding three-dimensional model of anterior segment swept-source optical coherence tomography (AS-SSOCT) were evaluated. All these data were analyzed using paired t test and rank sum test. Results BCVA of this 35 eyes was improved from (0.57±0.34)logMAR preoperatively to (0.15±0.15)logMAR 1 month postoperatively (t=7.753, P<0.01). There was no significant statistical differences among the IOP variation. Anterior chamber depth was (4.15±0.37)mm preoperatively and (4.16±0.39)mm 1 month postoperatively. Preoperative and 1 month postoperative IOL tilt in x orientation was -0.099°(-0.840°~0.057°) and -0.125°(-0.757°~0.067°), IOL tilt in y orientation was -0.015° (-0.564°~0.113°) and -0.014° (-0.210°~0.155°), IOL decentration in x orientation was 0.051(-0.066~0.192)mm and 0.049(-0.038~0.127)mm, IOL decentration in y orientation was 0.111(0.009~0.204)mm and 0.106(0.013~0.194)mm; the differences were without statistical significance. Conclusion Nd∶ YAG laser capsulotomy is effective and safe to treat posterior capsule opacification, BCVA improve postoperatively, the position of IOL is stable postoperatively, and postoperative anterior chamber depth, intraocular tilt and decentration have not siginificant changed. Key words: Laser, solid; Tomography, optical coherence; Lenses, intraocular; Posterior capsule opacification; Tilt; Decentration