Objective:
Our study aimed to investigate morphological changes using ultrasonic biomicroscopy (UBM) in the anterior segment after phakic pars plana vitrectomy (PPV) without tamponade.
Methods:
PPV surgery planned phakic patients were prospectively studied between October 2012 and March 2015. PPV patients who did not undergo cataract surgery and in whom intraocular tamponade was not used were included in the study. UBM measurements were taken a few days before and 10 days after the surgery. Through axial images of the anterior segment, the anterior chamber depth (ACD) and lens thickness (LT) were measured. Through the temporal quadrant over the radial cross-section images, the trabecular network-iris angle (TIA), ciliary body thickness (CBT), scleral thickness (ST), trabeculum-ciliary process’s distance (T-CPD), iris-ciliary process’s distance (I-CPD), and iris thickness (IT) were measured. Post- and preoperative values were statistically compared.
Results:
A total of 21 patients (14 females and 7 males) were included. A total of 16 left eye and 5 right eye surgeries were performed. With respect to the preoperative measurement, postoperative mean values of ACD, CBT1, CBT2, CBT Max, T-CPD significantly decreased (p=0.007, p=0.000, p=0.004, p=0.000, p=0.000, respectively), and LT and TIA values were found to be increased (0.001, and 0.001, respectively).
Conclusion:
PPV in phakic patients causes significant changes to the anterior segment parameters with ciliary body morphology.
Keywords: Ultrasound biomicroscopy, vitrectomy, phakic eye, anterior segment, ciliary body