Capsule measuring ring to predict capsular bag diameter and follow its course after foldable intraocular lens implantation.
OBJECTIVE
To evaluate the extent of capsular bag shrinkage after cataract surgery with intraocular lens (IOL) implantation and develop a regression formula to predict postoperative capsular bag size.


METHODS
Eye Hospital, Johannes Gutenberg-University, Mainz, Germany.


METHODS
The axial length (AL), anterior chamber depth, and corneal radius in 58 eyes were measured preoperatively. Cataract surgery was by phacoemulsification followed by implantation of a 3-piece, acrylic, posterior chamber IOL. The capsular bag diameter and anterior capsulorhexis were measured intraoperatively and 1 day and 1, 3, and 6 months postoperatively using a Koch capsule measuring ring (HumanOptics).


RESULTS
The mean capsular bag size was 10.53 mm intraoperatively, 10.31 mm at 1 day, 9.62 mm at 1 month, 9.07 mm at 3 months, and 9.01 mm at 6 months. The mean capsular bag shrinkage over the entire postoperative period was 14.8% (P<.001). Of the parameters studied, only AL had a positive correlation with capsule shrinkage. The correlation was moderate but statistically significant (P =.001).


CONCLUSIONS
A correlation was found between capsular bag shrinkage and AL. Using preoperative biometric data, a regression formula of moderate validity was determined to predict capsular bag shrinkage.
Tehrani
Mana
M
Department of Ophthalmology, Johannes Gutenberg-University, Mainz, Germany. tehrani@augen.klinik.uni-mainz.de
Dick
H Burkhard
HB
Krummenauer
Frank
F
Pfirrmann
Gudrun
G
Boyle
Thomas
T
Stoffelns
Bernhard M
BM
D000180:Acrylic Resins; D019923:Capsulorhexis / Q000295:instrumentation; D003315:Cornea / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D007903:Lens Capsule, Crystalline / Q000473:pathology*; D019654:Lens Implantation, Intraocular / Q000009:adverse effects* / Q000295:instrumentation; D007910:Lenses, Intraocular; D008297:Male; D018918:Phacoemulsification; D011183:Postoperative Complications
D000180:Acrylic Resins