Corneal stiffening after cross-linking questioned by deformation testing

PARIS — Cross-linked corneas were not found to be stiffer than normal corneas in a study performed with the Corvis ST tonometer. The Corvis ST (Oculus) uses Scheimpflug technology to visualize and measure the corneal deformation response to an air pulse, providing information on stiffness and viscoelasticity. “We measured the biomechanical changes produced on the cornea by LASIK, PRK, intracorneal rings (ICRs) and cross-linking 1 month postop.

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