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Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis
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Study on patterned photodynamic cross-linking for keratoconus.

Yingbing Hu1, Yu Huang2, Yun Chen1

  • 1Open FIESTA Center, International Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, PR China; Biomanufacturing Engineering Laboratory, International Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, PR China.

Experimental Eye Research
|January 26, 2021
PubMed
Summary
This summary is machine-generated.

Patterned corneal collagen cross-linking (CXL) using custom structures, like the bird's nest pattern, significantly improves keratoconus biomechanics. This approach offers a promising alternative to traditional ultraviolet (UV) irradiation methods for treating this eye condition.

Keywords:
Animal pathology modelCorneal biomechanicsKeratoconusPatterned corneal cross-linkingYoung's modulus

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Materials Science

Background:

  • Keratoconus is a progressive eye condition characterized by thinning and weakening of the cornea.
  • Traditional corneal collagen cross-linking (CXL) uses ultraviolet (UV) irradiation, which can cause complications.
  • Developing patterned CXL aims to enhance treatment efficacy and reduce UV-induced side effects.

Purpose of the Study:

  • To investigate patterned corneal collagen cross-linking (CXL) for keratoconus treatment.
  • To compare the efficacy of custom cross-linking patterns with traditional methods.
  • To reduce complications associated with UV irradiation in CXL.

Main Methods:

  • An animal model of keratoconus was created by injecting collagenase into rabbit corneas.
  • Two custom cross-linking patterns (bird's nest, honeycomb) and a traditional spot pattern were applied using a DMD chip.
  • Corneal morphology, stromal density, and biomechanical properties were evaluated using OCT, topography, and tensile tests.

Main Results:

  • All tested CXL methods improved corneal morphology and biomechanical properties without causing adverse effects like keratitis or haze.
  • Bird's nest patterned CXL demonstrated the most significant improvement in biomechanical properties (61.98% difference).
  • Honeycomb and traditional spot CXL also showed statistically significant improvements (16.13% and 21.07% differences, respectively).

Conclusions:

  • Patterned CXL, particularly the bird's nest structure, offers superior biomechanical enhancement for keratoconus compared to traditional methods.
  • Custom structural designs can achieve effective cross-linking with potentially reduced UV exposure.
  • This research paves the way for more precise and specialized CXL treatments for keratoconus.