title: A study to evaluate whether CTR increases refractive unpredictability between predicted and actual IOL position.
abstract: BACKGROUND
  The surgical management of cataract associated with extensive zonular loss presents a challenge for ophthalmic surgeon. Capsular Tension Ring (CTR) is commonly being used to stabilize the capsular bag in patients with zonular dialysis. CTR helps to avoid capsular collapse and vitreous presentation in AC during surgery and maintains the capsular bag, allowing the circular contour of the capsular bag, allowing intra ocular lens to be easily placed in the bag. The aim of the study was to know if there is any shift of IOL following use of CTR ring.
  
  
  METHODS
  We did a Ultrabiomicroscopy (UBM) examination to find out shift in PCIOL in cases in which CTR ring and compared it with cases without CTR ring.
  
  
  RESULTS
  It was found out through UBM in this study that there is actually a posterior shift of PCIOL after use of CTR ring leading to hypermetropic correction needed after surgery.
  
  
  CONCLUSIONS
  It is suggested that posterior shift of IOL following use of CTR should be kept in mind and the IOL implanted should be of + 1.0 to 2.0 D more than that calculated preoperatively.
authors.affiliation: Senior Adviser (Ophthalmology), Command Hospital (CC), Lucknow, UP, India.
authors.forename: V K
authors.initials: VK
authors.lastname: Baranwal
authors.affiliation: Classified Specialist (Ophthalmology), Command Hospital (SC), Pune-40, India.
authors.forename: Santosh
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Classified Specialist (Ophthalmology), Military Hospital Ahmedabad, India.
authors.forename: Avinash
authors.initials: A
authors.lastname: Mishra
authors.affiliation: Commandant, Command Hospital (CC), Lucknow, India.
authors.forename: Ajay K
authors.initials: AK
authors.lastname: Dutta
keywords: Capsular tension ring; Refraction; Ultrabiomicroscopy