@phdthesis{oai:u-ryukyu.repo.nii.ac.jp:02018033,
 author = {力石, 洋平 and Chikaraishi, Yohei},
 note = {Purpose: To evaluate zonular weakness before cataract surgery in eyes with primary angle closure disease (PACD). Study design: Retrospective Methods: This study was conducted at the University of the Ryukyus, Okinawa, Japan. We analyzed data from 133 eyes in 106 consecutive patients with PACD who underwent cataract surgery. PACD included PACS (primary angle closure suspect), PAC (primary angle closure), and PACG (primary angle closure glaucoma). We compared 68 eyes with zonular weakness and 65 eyes without zonular weakness, as identified during surgery. We developed three new ultrasound biomicroscopy (UBM) parameters. The SS-CP and SS-LS parameters were defined as the vertical distance between the scleral spur (SS) and the ciliary process (CP) or the lens surface (LS), respectively. The CP-LS parameter was defined as the distance between the CP and the LS. Results: Of the 133 eyes, 18 (13.5%), 50 (37.6%), and 65 (48.9%) were diagnosed with PACS, PAC, and PACG, respectively. Of the 68 eyes with zonular weakness, 8 eyes needed sulcus fixation of the intra ocular lens (IOL) because of lens subluxation. CP-LS was longer in eyes that required sulcus fixation of the IOL than in those that did not require sulcus fixation of the IOL (P < 0.01). 
Conclusions: A longer distance between the CP and the edge of the lens surface (CP-LS) necessitated a more difficult cataract surgery and greater frequency of sulcus fixation of the IOL. UBM examination is useful for detecting zonular weakness before surgery in PACD eyes.},
 school = {琉球大学},
 title = {Evaluation of weakness of ciliary zonule in primary angle closure diseases using ultrasound biomicroscopy}
}