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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Ocular Surface and External Filtration Surgery: Mutual Relationships.

Christophe Baudouin1

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Long-term glaucoma eye drops can harm the ocular surface, leading to inflammation and potential surgical failure. Understanding and managing these drug-induced changes is crucial for effective glaucoma treatment.

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Area of Science:

  • Ophthalmology
  • Ocular Surface Disease
  • Glaucoma Management

Background:

  • Long-term topical glaucoma medications can cause ocular surface changes, including inflammation and fibrosis.
  • Preservatives like benzalkonium chloride are implicated in toxic effects and surgical failure.
  • Adverse drug effects are often delayed and difficult to identify, stemming from complex drug-ocular surface interactions.

Purpose of the Study:

  • To highlight the impact of topical drug use on the ocular surface in glaucoma patients.
  • To emphasize the role of ocular surface inflammation in predicting surgical outcomes.
  • To advocate for a paradigm shift in glaucoma care focusing on ocular surface evaluation and management.

Main Methods:

  • Review of clinical and experimental evidence on topical drug effects.
  • Analysis of subclinical inflammation in patients undergoing long-term antiglaucoma treatment.
  • Examination of the role of preservatives, particularly benzalkonium chloride.
  • Assessment of the impact of ocular surface changes on postoperative outcomes.

Main Results:

  • Topical drug use can lead to dry eye, inflammation, fibrosis, and corneal impairment.
  • Benzalkonium chloride demonstrates toxic effects, inducing inflammation and acting as a risk factor for surgical failure.
  • Preoperative ocular surface inflammation is linked to postoperative fibrosis and reduced surgical success.

Conclusions:

  • Ocular surface changes induced by topical glaucoma medications are significant and can compromise surgical outcomes.
  • Effective glaucoma management requires a comprehensive understanding and proactive management of the ocular surface.
  • Integrating ocular surface evaluation into routine glaucoma care is essential for long-term treatment success.