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Related Experiment Video

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Conventional versus accelerated collagen cross-linking for keratoconus.

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  • 1Tissue Engineering and Stem Cell Group (A.K., J.S.M.), Singapore Eye Research Institute, Singapore, Singapore; Singapore National Eye Centre (A.K., J.S.M.), Singapore, Singapore; Yong Loo Lin School of Medicine (J.S.M.), National University of Singapore, Singapore, Singapore; Nanyang Technological University (J.S.M.), Singapore, Singapore; and Department of Clinical Sciences (J.S.M.), Duke-NUS Graduate Medical School, Singapore, Singapore.

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Collagen cross-linking (CXL) effectively stabilizes vision and corneal topography for keratoconus patients. Accelerated CXL protocols show promise for shorter treatment times with similar safety profiles, though further research is needed.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Keratoconus is a progressive eye condition characterized by corneal thinning and irregular astigmatism.
  • Corneal collagen cross-linking (CXL) is a therapeutic procedure designed to enhance corneal rigidity.
  • The standard Dresden protocol involves riboflavin saturation followed by ultraviolet A (UVA) irradiation.

Purpose of the Study:

  • To review the efficacy and safety of conventional and accelerated collagen cross-linking (CXL) for treating keratoconus.
  • To evaluate the impact of CXL on visual acuity and corneal topography.
  • To assess the safety profile of CXL, including endothelial cell loss and infection risk.

Main Methods:

  • Review of existing evidence on conventional CXL (Dresden protocol) and accelerated CXL protocols.
  • Analysis of treatment parameters including UVA irradiance, duration, and cumulative dose.
  • Assessment of patient outcomes related to visual stability and topographic changes.

Main Results:

  • Conventional CXL demonstrates high efficacy in stabilizing vision and corneal topography in most keratoconus patients.
  • The standard CXL procedure exhibits a favorable safety profile with minimal risks.
  • Accelerated CXL protocols, using higher irradiance for shorter durations, suggest comparable efficacy and safety, but require further validation.

Conclusions:

  • Conventional CXL is an effective and safe treatment for keratoconus.
  • Accelerated CXL protocols present a viable alternative for reducing treatment time.
  • Larger randomized controlled studies are necessary to confirm the noninferiority and long-term outcomes of accelerated CXL compared to the conventional method.