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Capsular bag shrinkage, axial length linked

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The amount of capsular bag shrinkage after cataract surgery can be predicted from preoperative measurements, a study found. Researchers found a correlation between axial length and capsular bag shrinkage that allowed them to devise a regression formula with “moderate validity.”

Mana Tehrani, MD, and colleagues at Johannes Gutenberg University in Mainz, Germany, preoperatively measured axial length, anterior chamber depth and corneal radius in 58 eyes before cataract surgery. All eyes underwent phacoemulsification followed by implantation of a 3-piece acrylic IOL.

Mean capsular bag size was 10.53 mm intraoperatively, 10.31 mm at day 1, 9.62 mm at 1 month, 9.07 mm at 3 months and 9.01 mm at 6 months. Over the course of the entire postop period, the mean shrinkage was 14.8%. Of the parameters studied, only axial length had a positive correlation with capsule shrinkage, the researchers found.

The study is published in the November issue of Journal of Cataract & Refractive Surgery.