J Korean Ophthalmol Soc.  2006 Feb;47(2):221-226.

New Model of Capsule Measuring Ring: The Possibility to Predict the Capsular Bag Diameter

• Cha YD
• Kim HJ
• Lee DH

Abstract

PURPOSE: This study evaluates the capsular bag diameter (CBD) with a capsular tension ring (CTR) following cataract surgery and analyzes the predictive factors correlated with capsular bag size to predict CBD preoperatively.
METHODS
We inserted the CTR before intraocular lens (IOLs) implantation in 25 eyes undergoing cataract surgery. The axial length (AL), anterior chamber depth (ACD), and lens thickness were measured and keratometry and corneal size were checked preoperatively. Also, the continuous curvilinear capsulorhexis size was measured at 7 days postoperative, and CBD was calculated with CTR in a dilated state at 1day, 1week, 1 month, and 2 months postoperative.
RESULTS
The mean CBD gradually decreased from 11.30+/-1.76 mm at 1 day, 10.86+/-1.06 mm at 1 week, 10.23+/-1.43 mm at 1 month, and 9.88+/-1.31 mm at 2 months. The AL (R=0.657), ACD (R=0.481), and corneal size (R=0.348) had a positive correlation with CBD at 1 week postoperative. The AL (P=0.000) and ACD (p=0.015) were statistically significant predictive factors for CBD.
CONCLUSIONS
Calculating CBD with the CTR helps to improve visual acuity following cataract surgery after implantation of IOLs having appropriate sizes predicted with AL, ACD, and corneal size.

Keyword

Anterior chamber depth; Axial length; Capsular bag diameter; Capsular tension ring; Corneal size

MeSH Terms

Anterior Chamber
Capsulorhexis
Cataract
Lenses, Intraocular
Visual Acuity