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Why does posterior capsule opacification occur after cataract surgery?

3 min read

Posterior capsule opacification (PCO) occurs because lens epithelial cells (LECs) that remain on the anterior capsule after cataract surgery undergo proliferation, migration, and transformation, ultimately clouding the posterior capsule behind the implanted intraocular lens. Despite meticulous surgical technique, complete removal of all LECs during cataract surgery is not possible, as cells remain attached to the anterior capsule and at the equatorial zone. ¹

Following surgery, these residual LECs are exposed to inflammatory mediators, growth factors such as transforming growth factor-beta (TGF-β), and cytokines released during the wound healing response. ² This biochemical environment triggers cellular activity. LECs proliferate, migrate posteriorly across the capsular bag, and undergo epithelial-mesenchymal transition (EMT), a process where epithelial cells transform into myofibroblast-like cells capable of producing extracellular matrix proteins, collagen, and fibronectin. ¹ The deposition of these proteins, combined with cellular aggregation and fibrosis, results in opacification and wrinkling of the posterior capsule.

The type and severity of PCO depend on several factors. Fibrotic PCO, characterised by capsular contraction and wrinkling, results from myofibroblast transformation. Regeneratory PCO, presenting as pearl-like opacities known as Elschnig pearls, arises from swollen, proliferating LECs. ² Patient-related factors such as younger age, diabetes, and uveitis increase PCO risk. Surgical factors, including retained cortical material and incomplete capsular polishing, also contribute.

Intraocular lens design significantly influences PCO rates. Modern hydrophobic acrylic IOLs with sharp, square posterior edges create a mechanical barrier that inhibits LEC migration, substantially reducing PCO incidence compared to older lens designs with rounded edges or hydrophilic materials. ³

References

  1. Awasthi N, Guo S, Wagner BJ. Posterior capsular opacification: Pathogenesis, challenges, and preventive strategies. Biomedicine and Pharmacotherapy. 2025;182:117720.
  2. Wang L, Liu CS. The Role of Lens Epithelial Cell Senescence in the Pathogenesis of Posterior Capsule Opacification. Investigative Ophthalmology and Visual Science. 2025;66(8):29.
  3. Nibourg LM, Gelens E, Kuijer R, Hooymans JM, van Kooten TG, Koopmans SA. Prevention of posterior capsular opacification. Experimental Eye Research. 2015;136:100-115.

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